diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..485dee6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea
diff --git a/.travis.yml b/.travis.yml
index 9791de5..0e43863 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,10 +20,18 @@ addons:
       - clang-3.7
 
 install:
-  - pip install pep8
+  - pip install pep8 lit
 
 script:
-  - pep8 libear libscanbuild tests
+  - lit -v tests
   - python setup.py check
   - python setup.py install
-  - python setup.py test
+  - python setup.py sdist
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/c3b71470714f6eaa03bc
+    on_success: change
+    on_failure: always
+    on_start: never
diff --git a/setup.py b/setup.py
index 63b52db..3a7bdf1 100644
--- a/setup.py
+++ b/setup.py
@@ -36,6 +36,5 @@ setup(
         "Programming Language :: Python :: 3.5",
         "Topic :: Software Development :: Compilers",
         "Topic :: Software Development :: Quality Assurance"
-    ],
-    test_suite="tests.suite"
+    ]
 )
diff --git a/tests/__init__.py b/tests/__init__.py
deleted file mode 100644
index 94dc69d..0000000
--- a/tests/__init__.py
+++ /dev/null
@@ -1,18 +0,0 @@
-# -*- coding: utf-8 -*-
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-
-import unittest
-
-import tests.unit
-import tests.functional.cases
-
-
-def suite():
-    loader = unittest.TestLoader()
-    ts = unittest.TestSuite()
-    ts.addTests(loader.loadTestsFromModule(tests.unit))
-    ts.addTests(loader.loadTestsFromModule(tests.functional.cases))
-    return ts
diff --git a/tests/functional/src/broken-one.c b/tests/functional/Input/broken/one.c
similarity index 100%
rename from tests/functional/src/broken-one.c
rename to tests/functional/Input/broken/one.c
diff --git a/tests/functional/src/broken-two.c b/tests/functional/Input/broken/two.c
similarity index 100%
rename from tests/functional/src/broken-two.c
rename to tests/functional/Input/broken/two.c
diff --git a/tests/functional/src/include/clean-one.h b/tests/functional/Input/clean/include/one.h
similarity index 100%
rename from tests/functional/src/include/clean-one.h
rename to tests/functional/Input/clean/include/one.h
diff --git a/tests/functional/src/clean-one.c b/tests/functional/Input/clean/one.c
similarity index 85%
rename from tests/functional/src/clean-one.c
rename to tests/functional/Input/clean/one.c
index 08c5f33..907ec66 100644
--- a/tests/functional/src/clean-one.c
+++ b/tests/functional/Input/clean/one.c
@@ -1,4 +1,4 @@
-#include <clean-one.h>
+#include <one.h>
 
 int do_nothing_loop()
 {
diff --git a/tests/functional/src/clean-two.c b/tests/functional/Input/clean/two.c
similarity index 88%
rename from tests/functional/src/clean-two.c
rename to tests/functional/Input/clean/two.c
index 73bc288..613a373 100644
--- a/tests/functional/src/clean-two.c
+++ b/tests/functional/Input/clean/two.c
@@ -1,4 +1,4 @@
-#include <clean-one.h>
+#include "one.h"
 
 #include <stdlib.h>
 
diff --git a/tests/functional/src/emit-one.c b/tests/functional/Input/dirty/one.c
similarity index 100%
rename from tests/functional/src/emit-one.c
rename to tests/functional/Input/dirty/one.c
diff --git a/tests/functional/src/emit-two.c b/tests/functional/Input/dirty/two.c
similarity index 100%
rename from tests/functional/src/emit-two.c
rename to tests/functional/Input/dirty/two.c
diff --git a/tests/functional/src/main.c b/tests/functional/Input/main.c
similarity index 100%
rename from tests/functional/src/main.c
rename to tests/functional/Input/main.c
diff --git a/tests/functional/bin/cdb_diff b/tests/functional/bin/cdb_diff
new file mode 100755
index 0000000..4bc6bb1
--- /dev/null
+++ b/tests/functional/bin/cdb_diff
@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+
+import sys
+import argparse
+import json
+
+
+def diff(lhs, rhs):
+    def create_hash(entry):
+        return entry['file'][::-1] + entry['command'] + entry['directory']
+
+    left = {create_hash(entry): entry for entry in lhs}
+    right = {create_hash(entry): entry for entry in rhs}
+    result = []
+    for key in left.keys():
+        if key not in right:
+            result.append('> {}'.format(left[key]))
+    for key in right.keys():
+        if key not in left:
+            result.append('< {}'.format(right[key]))
+    return result
+
+
+def main():
+    """ Semantically diff two compilation databases. """
+    parser = argparse.ArgumentParser()
+    parser.add_argument('left', type=argparse.FileType('r'))
+    parser.add_argument('right', type=argparse.FileType('r'))
+    args = parser.parse_args()
+    # files are open, parse the json content
+    lhs = json.load(args.left)
+    rhs = json.load(args.right)
+    # run the diff and print the result
+    results = diff(lhs, rhs)
+    for result in results:
+        print(result)
+    return len(results)
+
+
+sys.exit(main())
diff --git a/tests/functional/bin/cdb_run b/tests/functional/bin/cdb_run
new file mode 100755
index 0000000..37afb0a
--- /dev/null
+++ b/tests/functional/bin/cdb_run
@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+
+import os
+import sys
+import argparse
+import json
+import shlex
+import multiprocessing
+import subprocess
+
+
+def run(entry):
+    command = shlex.split(entry['command'])
+    # do respect 'CC' and 'CXX' environment variables for compiler
+    env_name = 'CC' if command[0] == 'cc' else 'CXX'
+    if env_name in os.environ:
+        command[0] = os.environ[env_name]
+    # execute the command in the given directory
+    # map exit code to 0/1 to get the correct fail count
+    print('exec {0} in {1}'.format(command, entry['directory']))
+    return 1 if subprocess.call(command, cwd=entry['directory']) else 0
+
+
+def main():
+    """ Execute compilation commands from a given compilation database. """
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--parallel', type=int, default=1)
+    parser.add_argument('cdb', type=argparse.FileType('r'))
+    args = parser.parse_args()
+    # execute compilation database entry
+    failures = 0
+    pool = multiprocessing.Pool(args.parallel)
+    for current in pool.imap_unordered(run, json.load(args.cdb)):
+        failures += current
+    pool.close()
+    pool.join()
+    return failures
+
+
+sys.exit(main())
diff --git a/tests/functional/bin/cdb_substitute b/tests/functional/bin/cdb_substitute
new file mode 100755
index 0000000..5482022
--- /dev/null
+++ b/tests/functional/bin/cdb_substitute
@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+
+import os
+import re
+import sys
+import random
+
+
+def comment(line):
+    return re.match(r'^(#|//).*', line)
+
+
+def random_filename():
+    def random_char():
+        return random.choice([chr(random.randrange(ord('a'), ord('z'), 1)),
+                              chr(random.randrange(ord('A'), ord('Z'), 1))])
+
+    return ''.join(random_char() for _ in range(12))
+
+
+def substitute(line):
+
+    def lookup(key):
+        return random_filename() if key == 'random' else os.environ[key]
+
+    requests = re.findall(r'\$\{([^\}]+)\}', line)
+    if requests:
+        replace = {re.escape(request): lookup(request) for request in requests}
+        for key, value in replace.items():
+            line = re.sub(r'\$\{' + key + r'\}', value, line)
+    return line
+
+
+def main():
+    """ Substitute environment literals in a given compilation database. """
+    inputs = (line for line in sys.stdin)
+    outputs = (substitute(line) for line in inputs if not comment(line))
+    for line in outputs:
+        sys.stdout.write(line)
+    return 0
+
+
+sys.exit(main())
diff --git a/tests/functional/cases/__init__.py b/tests/functional/cases/__init__.py
deleted file mode 100644
index 6c78760..0000000
--- a/tests/functional/cases/__init__.py
+++ /dev/null
@@ -1,71 +0,0 @@
-# -*- coding: utf-8 -*-
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-
-import re
-import os.path
-import subprocess
-
-
-def load_tests(loader, suite, pattern):
-    from . import test_from_cdb
-    suite.addTests(loader.loadTestsFromModule(test_from_cdb))
-    from . import test_from_cmd
-    suite.addTests(loader.loadTestsFromModule(test_from_cmd))
-    from . import test_create_cdb
-    suite.addTests(loader.loadTestsFromModule(test_create_cdb))
-    from . import test_exec_anatomy
-    suite.addTests(loader.loadTestsFromModule(test_exec_anatomy))
-    return suite
-
-
-def make_args(target):
-    this_dir, _ = os.path.split(__file__)
-    path = os.path.normpath(os.path.join(this_dir, '..', 'src'))
-    return ['make', 'SRCDIR={}'.format(path), 'OBJDIR={}'.format(target), '-f',
-            os.path.join(path, 'build', 'Makefile')]
-
-
-def silent_call(cmd, *args, **kwargs):
-    kwargs.update({'stdout': subprocess.PIPE, 'stderr': subprocess.STDOUT})
-    return subprocess.call(cmd, *args, **kwargs)
-
-
-def silent_check_call(cmd, *args, **kwargs):
-    kwargs.update({'stdout': subprocess.PIPE, 'stderr': subprocess.STDOUT})
-    return subprocess.check_call(cmd, *args, **kwargs)
-
-
-def call_and_report(analyzer_cmd, build_cmd):
-    child = subprocess.Popen(analyzer_cmd + ['-v'] + build_cmd,
-                             universal_newlines=True,
-                             stdout=subprocess.PIPE,
-                             stderr=subprocess.STDOUT)
-
-    pattern = re.compile('Report directory created: (.+)')
-    directory = None
-    for line in child.stdout.readlines():
-        match = pattern.search(line)
-        if match and match.lastindex == 1:
-            directory = match.group(1)
-            break
-    child.stdout.close()
-    child.wait()
-
-    return child.returncode, directory
-
-
-def check_call_and_report(analyzer_cmd, build_cmd):
-    exit_code, result = call_and_report(analyzer_cmd, build_cmd)
-    if exit_code != 0:
-        raise subprocess.CalledProcessError(
-            exit_code, analyzer_cmd + build_cmd, None)
-    else:
-        return result
-
-
-def create_empty_file(filename):
-    with open(filename, 'a') as handle:
-        pass
diff --git a/tests/functional/__init__.py b/tests/functional/cases/analyze/analyze_architecture_specified.ft
similarity index 100%
rename from tests/functional/__init__.py
rename to tests/functional/cases/analyze/analyze_architecture_specified.ft
diff --git a/tests/functional/cases/analyze/analyze_debug_code.ft b/tests/functional/cases/analyze/analyze_debug_code.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/analyze_enable_checkers.ft b/tests/functional/cases/analyze/analyze_enable_checkers.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/analyze_exclude_files.ft b/tests/functional/cases/analyze/analyze_exclude_files.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/analyze_intercept_library.ft b/tests/functional/cases/analyze/analyze_intercept_library.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/analyze_intercept_wrapper.ft b/tests/functional/cases/analyze/analyze_intercept_wrapper.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/analyze_interposition.ft b/tests/functional/cases/analyze/analyze_interposition.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/analyze_language_specified.ft b/tests/functional/cases/analyze/analyze_language_specified.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/exit_code_failed.ft b/tests/functional/cases/analyze/exit_code_failed.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/exit_code_failed_shows_bugs.ft b/tests/functional/cases/analyze/exit_code_failed_shows_bugs.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/exit_code_failed_shows_bugs_on_plist.ft b/tests/functional/cases/analyze/exit_code_failed_shows_bugs_on_plist.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/src/compilation_database/build_clean.json.in b/tests/functional/cases/analyze/exit_code_success.ft
similarity index 100%
rename from tests/functional/src/compilation_database/build_clean.json.in
rename to tests/functional/cases/analyze/exit_code_success.ft
diff --git a/tests/functional/cases/analyze/exit_code_success_shows_bugs.ft b/tests/functional/cases/analyze/exit_code_success_shows_bugs.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/analyze/exit_code_success_shows_bugs_on_plist.ft b/tests/functional/cases/analyze/exit_code_success_shows_bugs_on_plist.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/intercept/broken_build.sh b/tests/functional/cases/intercept/broken_build.sh
new file mode 100644
index 0000000..44e6afd
--- /dev/null
+++ b/tests/functional/cases/intercept/broken_build.sh
@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+# RUN: intercept-build --override-compiler --cdb %t.json.wrapper sh %s
+# RUN: cdb_diff %t.json.wrapper %T/broken_build.json.expected
+#
+# when library preload disabled, it falls back to use compiler wrapper
+#
+# RUN: intercept-build --cdb %t.json.preload sh %s
+# RUN: cdb_diff %t.json.preload %T/broken_build.json.expected
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+cd "${test_input_dir}"
+${CC}  -c -o ${test_output_dir}/main.o main.c
+cd "${test_input_dir}/clean"
+${CC}  -c -o ${test_output_dir}/clean_one.o -Iinclude one.c
+cd "${test_input_dir}"
+${CXX} -c -o ${test_output_dir}/clean_two.o -I ./clean/include clean/two.c
+cd "${test_input_dir}/broken"
+${CC}  -c -o ${test_output_dir}/broken_one.o one.c || true
+cd "${test_input_dir}"
+${CXX} -c -o ${test_output_dir}/broken_two.o broken/two.c || true
+
+cat > ${test_output_dir}/broken_build.json.expected << EOF
+[
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/main.o main.c",
+  "file": "${test_input_dir}/main.c"
+}
+,
+{
+  "directory": "${test_input_dir}/clean",
+  "command": "cc -c -o ${test_output_dir}/clean_one.o -Iinclude one.c",
+  "file": "${test_input_dir}/clean/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "c++ -c -o ${test_output_dir}/clean_two.o -I ./clean/include clean/two.c",
+  "file": "${test_input_dir}/clean/two.c"
+}
+,
+{
+  "directory": "${test_input_dir}/broken",
+  "command": "cc -c -o ${test_output_dir}/broken_one.o one.c",
+  "file": "${test_input_dir}/broken/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "c++ -c -o ${test_output_dir}/broken_two.o broken/two.c",
+  "file": "${test_input_dir}/broken/two.c"
+}
+]
+EOF
diff --git a/tests/functional/cases/intercept/clean_env_build_intercept.sh b/tests/functional/cases/intercept/clean_env_build_intercept.sh
new file mode 100644
index 0000000..6af968b
--- /dev/null
+++ b/tests/functional/cases/intercept/clean_env_build_intercept.sh
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# REQUIRES: preload
+# RUN: intercept-build --cdb %t.json.result sh %s
+# RUN: cdb_diff %T/clean_env_build_intercept.sh.json %t.json.result
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+CC=$(which clang)
+
+cd ${test_input_dir}
+env - ${CC} -c -o ${test_output_dir}/clean_env_main.o main.c
+
+cat > ${test_output_dir}/clean_env_build_intercept.sh.json << EOF
+[
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/clean_env_main.o main.c",
+  "file": "${test_input_dir}/main.c"
+}
+]
+EOF
diff --git a/tests/functional/cases/intercept/deal_with_existing_database.sh b/tests/functional/cases/intercept/deal_with_existing_database.sh
new file mode 100644
index 0000000..b8b1541
--- /dev/null
+++ b/tests/functional/cases/intercept/deal_with_existing_database.sh
@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+# RUN: sh %s
+# this script run the whole test, not other control from lit
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+PREFIX="${test_output_dir}/output_handling"
+
+cat > ${PREFIX}.compile_main.sh << EOF
+set -o errexit
+set -o nounset
+set -o xtrace
+
+cd "${test_input_dir}"
+\${CC} -c -o ${test_output_dir}/main.o main.c
+EOF
+
+cat > ${PREFIX}.compile_dirty.sh << EOF
+set -o errexit
+set -o nounset
+set -o xtrace
+
+cd "${test_input_dir}/dirty"
+\${CC} -c -o ${test_output_dir}/dirty_one.o one.c
+\${CC} -c -o ${test_output_dir}/dirty_two.o two.c
+EOF
+
+cat > ${PREFIX}.main.json << EOF
+[
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/main.o main.c",
+  "file": "${test_input_dir}/main.c"
+}
+]
+EOF
+
+cat > ${PREFIX}.dirty.json << EOF
+[
+{
+  "directory": "${test_input_dir}/dirty",
+  "command": "cc -c -o ${test_output_dir}/dirty_one.o one.c",
+  "file": "${test_input_dir}/dirty/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}/dirty",
+  "command": "cc -c -o ${test_output_dir}/dirty_two.o two.c",
+  "file": "${test_input_dir}/dirty/two.c"
+}
+]
+EOF
+
+cat > ${PREFIX}.final.json << EOF
+[
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/main.o main.c",
+  "file": "${test_input_dir}/main.c"
+}
+,
+{
+  "directory": "${test_input_dir}/dirty",
+  "command": "cc -c -o ${test_output_dir}/dirty_one.o one.c",
+  "file": "${test_input_dir}/dirty/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}/dirty",
+  "command": "cc -c -o ${test_output_dir}/dirty_two.o two.c",
+  "file": "${test_input_dir}/dirty/two.c"
+}
+]
+EOF
+
+# preparation: create a simple compilation database
+intercept-build --cdb ${PREFIX}.json sh ${PREFIX}.compile_main.sh
+cdb_diff ${PREFIX}.main.json ${PREFIX}.json
+# overwrite the previously created compilation database
+intercept-build --cdb ${PREFIX}.json sh ${PREFIX}.compile_dirty.sh
+cdb_diff ${PREFIX}.dirty.json ${PREFIX}.json
+# append to the previously created compilation database
+intercept-build --cdb ${PREFIX}.json --append sh ${PREFIX}.compile_main.sh
+cdb_diff ${PREFIX}.final.json ${PREFIX}.json
diff --git a/tests/functional/exec/CMakeLists.txt b/tests/functional/cases/intercept/exec/CMakeLists.txt
similarity index 100%
rename from tests/functional/exec/CMakeLists.txt
rename to tests/functional/cases/intercept/exec/CMakeLists.txt
diff --git a/tests/functional/exec/config.h.in b/tests/functional/cases/intercept/exec/config.h.in
similarity index 100%
rename from tests/functional/exec/config.h.in
rename to tests/functional/cases/intercept/exec/config.h.in
diff --git a/tests/functional/exec/main.c b/tests/functional/cases/intercept/exec/main.c
similarity index 87%
rename from tests/functional/exec/main.c
rename to tests/functional/cases/intercept/exec/main.c
index 830cf37..465e771 100644
--- a/tests/functional/exec/main.c
+++ b/tests/functional/cases/intercept/exec/main.c
@@ -8,9 +8,10 @@
 #include "config.h"
 
 #include <sys/wait.h>
-#include <unistd.h>
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <paths.h>
 
 #if defined HAVE_POSIX_SPAWN || defined HAVE_POSIX_SPAWNP
@@ -265,10 +266,39 @@ void call_posix_spawnp() {
 #endif
 
 int main(int argc, char *const argv[]) {
-    if (argc != 2)
-        exit(EXIT_FAILURE);
 
-    expected_out_open(argv[1]);
+    char *workdir = NULL;
+    char *output = NULL;
+    int c = 0;
+
+    opterr = 0;
+    while ((c = getopt (argc, argv, "C:o:")) != -1) {
+        switch (c) {
+            case 'C':
+                workdir = optarg;
+                break;
+            case 'o':
+                output = optarg;
+                break;
+            case '?':
+                if (optopt == 'C' || optopt == 'o')
+                    fprintf (stderr, "Option -%c requires an argument.\n", optopt);
+                else if (isprint (optopt))
+                    fprintf (stderr, "Unknown option `-%c'.\n", optopt);
+                else
+                    fprintf (stderr, "Unknown option character `\\x%x'.\n", optopt);
+                return 1;
+            default:
+                abort();
+        }
+    }
+    for (int index = optind; index < argc; ++index)
+        printf ("Non-option argument %s\n", argv[index]);
+
+    if (workdir != NULL) {
+        chdir(workdir);
+    }
+    expected_out_open(output);
 #ifdef HAVE_EXECV
     call_execv();
 #endif
diff --git a/tests/functional/cases/intercept/exec/run_exec_test.sh b/tests/functional/cases/intercept/exec/run_exec_test.sh
new file mode 100644
index 0000000..7e889b5
--- /dev/null
+++ b/tests/functional/cases/intercept/exec/run_exec_test.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# REQUIRES: preload
+# RUN: cmake -B%T -H%S
+# RUN: make -C %T
+# RUN: intercept-build --cdb %T/result.json %T/exec -C %T -o expected.json
+# RUN: cdb_diff %T/result.json %T/expected.json
diff --git a/tests/functional/cases/intercept/flags_are_filtered.sh b/tests/functional/cases/intercept/flags_are_filtered.sh
new file mode 100644
index 0000000..7171e5b
--- /dev/null
+++ b/tests/functional/cases/intercept/flags_are_filtered.sh
@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# RUN: intercept-build --cdb %t.json.result sh %s
+# RUN: cdb_diff %T/flags_are_filtered.sh.json %t.json.result
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+# set up unique names for this test
+PREFIX=flagfiltering
+# set up platform specific linker options
+if [ `uname -o | grep -i linux` ]; then
+  LD_FLAGS="-o ${test_output_dir}/lib${PREFIX}.so -shared -Wl,-soname,${PREFIX}"
+elif [ `uname -o | grep -i darwin` ]; then
+  LD_FLAGS="-o ${test_output_dir}/lib${PREFIX}.dylib -dynamiclib -install_name @rpath/${PREFIX}"
+fi
+
+cd ${test_input_dir}
+
+# non compilation calls shall not be in the result
+${CC} -### -c main.c 2> /dev/null
+${CC} -E -o "${test_output_dir}/$$.i" main.c
+${CC} -S -o "${test_output_dir}/$$.asm" main.c
+${CC} -c -o "${test_output_dir}/$$.d" -M main.c
+${CC} -c -o "${test_output_dir}/$$.d" -MM main.c
+
+# preprocessor flags shall be filtered
+${CC} -c -o "${test_output_dir}/${PREFIX}_clean_one.o" -fpic -Iclean/include -MD -MT target -MF "${test_output_dir}/${PREFIX}_clean_one.d" clean/one.c
+${CC} -c -o "${test_output_dir}/${PREFIX}_clean_two.o" -fpic -Iclean/include -MMD -MQ target -MF "${test_output_dir}/${PREFIX}_clean_two.d" clean/two.c
+
+# linking shall not in the result
+${CC} ${LD_FLAGS} "${test_output_dir}/${PREFIX}_clean_one.o" "${test_output_dir}/${PREFIX}_clean_two.o"
+
+# linker flags shall be filtered
+${CC} -o "${test_output_dir}/${PREFIX}_one" "-l${PREFIX}" "-L${test_output_dir}" main.c
+${CC} -o "${test_output_dir}/${PREFIX}_two" -l ${PREFIX} -L ${test_output_dir} main.c
+
+cat > ${test_output_dir}/flags_are_filtered.sh.json << EOF
+[
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/${PREFIX}_clean_one.o -fpic -Iclean/include clean/one.c",
+  "file": "${test_input_dir}/clean/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/${PREFIX}_clean_two.o -fpic -Iclean/include clean/two.c",
+  "file": "${test_input_dir}/clean/two.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/${PREFIX}_one main.c",
+  "file": "${test_input_dir}/main.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/${PREFIX}_two main.c",
+  "file": "${test_input_dir}/main.c"
+}
+]
+EOF
diff --git a/tests/functional/cases/intercept/lit.local.cfg b/tests/functional/cases/intercept/lit.local.cfg
new file mode 100644
index 0000000..c64c663
--- /dev/null
+++ b/tests/functional/cases/intercept/lit.local.cfg
@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+
+import os.path
+import lit.util
+
+# test_source_root: The root path where tests are located.
+this_dir = os.path.dirname(__file__)
+
+config.environment['test_output_dir'] = os.path.join(this_dir, 'Output')
diff --git a/tests/functional/cases/intercept/multiple_source_single_command.sh b/tests/functional/cases/intercept/multiple_source_single_command.sh
new file mode 100644
index 0000000..64834e9
--- /dev/null
+++ b/tests/functional/cases/intercept/multiple_source_single_command.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# RUN: intercept-build --cdb %t.json.result sh %s
+# RUN: cdb_diff %T/multiple_source_single_command.sh.json %t.json.result
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+cd ${test_input_dir}
+${CC} -o ${test_output_dir}/all_in_one main.c dirty/one.c dirty/two.c
+
+cat > ${test_output_dir}/multiple_source_single_command.sh.json << EOF
+[
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/all_in_one main.c",
+  "file": "${test_input_dir}/main.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/all_in_one dirty/one.c",
+  "file": "${test_input_dir}/dirty/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/all_in_one dirty/two.c",
+  "file": "${test_input_dir}/dirty/two.c"
+}
+]
+EOF
diff --git a/tests/functional/cases/intercept/parallel_build.sh b/tests/functional/cases/intercept/parallel_build.sh
new file mode 100644
index 0000000..d8b39da
--- /dev/null
+++ b/tests/functional/cases/intercept/parallel_build.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+# RUN: intercept-build --override-compiler --cdb %t.json.wrapper sh %s
+# RUN: cdb_diff %t.json.wrapper %T/parallel_build.json.expected
+#
+# when library preload disabled, it falls back to use compiler wrapper
+#
+# RUN: intercept-build --cdb %t.json.preload sh %s
+# RUN: cdb_diff %t.json.preload %T/parallel_build.json.expected
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+cd "${test_input_dir}"
+${CC}  -c -o ${test_output_dir}/main.o main.c &
+cd "${test_input_dir}/clean"
+${CC}  -c -o ${test_output_dir}/clean_one.o -Iinclude one.c &
+cd "${test_input_dir}"
+${CXX} -c -o ${test_output_dir}/clean_two.o -I ./clean/include clean/two.c &
+cd "${test_input_dir}/dirty"
+${CC}  -c -o ${test_output_dir}/dirty_one.o -Wall one.c &
+cd "${test_input_dir}"
+${CXX} -c -o ${test_output_dir}/dirty_two.o -Wall dirty/two.c &
+
+wait
+
+cat > ${test_output_dir}/parallel_build.json.expected << EOF
+[
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/main.o main.c",
+  "file": "${test_input_dir}/main.c"
+}
+,
+{
+  "directory": "${test_input_dir}/clean",
+  "command": "cc -c -o ${test_output_dir}/clean_one.o -Iinclude one.c",
+  "file": "${test_input_dir}/clean/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "c++ -c -o ${test_output_dir}/clean_two.o -I ./clean/include clean/two.c",
+  "file": "${test_input_dir}/clean/two.c"
+}
+,
+{
+  "directory": "${test_input_dir}/dirty",
+  "command": "cc -c -o ${test_output_dir}/dirty_one.o -Wall one.c",
+  "file": "${test_input_dir}/dirty/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "c++ -c -o ${test_output_dir}/dirty_two.o -Wall dirty/two.c",
+  "file": "${test_input_dir}/dirty/two.c"
+}
+]
+EOF
\ No newline at end of file
diff --git a/tests/functional/cases/intercept/successful_build.sh b/tests/functional/cases/intercept/successful_build.sh
new file mode 100644
index 0000000..77978cd
--- /dev/null
+++ b/tests/functional/cases/intercept/successful_build.sh
@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+# RUN: intercept-build --override-compiler --cdb %t.json.wrapper sh %s
+# RUN: cdb_diff %t.json.wrapper %T/successful_build.json.expected
+#
+# when library preload disabled, it falls back to use compiler wrapper
+#
+# RUN: intercept-build --cdb %t.json.preload sh %s
+# RUN: cdb_diff %t.json.preload %T/successful_build.json.expected
+
+set -o errexit
+set -o nounset
+set -o xtrace
+
+cd "${test_input_dir}"
+${CC}  -c -o ${test_output_dir}/main.o main.c
+cd "${test_input_dir}/clean"
+${CC}  -c -o ${test_output_dir}/clean_one.o -Iinclude one.c
+cd "${test_input_dir}"
+${CXX} -c -o ${test_output_dir}/clean_two.o -I ./clean/include clean/two.c
+cd "${test_input_dir}/dirty"
+${CC}  -c -o ${test_output_dir}/dirty_one.o -Wall one.c
+cd "${test_input_dir}"
+${CXX} -c -o ${test_output_dir}/dirty_two.o -Wall dirty/two.c
+
+cat > ${test_output_dir}/successful_build.json.expected << EOF
+[
+{
+  "directory": "${test_input_dir}",
+  "command": "cc -c -o ${test_output_dir}/main.o main.c",
+  "file": "${test_input_dir}/main.c"
+}
+,
+{
+  "directory": "${test_input_dir}/clean",
+  "command": "cc -c -o ${test_output_dir}/clean_one.o -Iinclude one.c",
+  "file": "${test_input_dir}/clean/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "c++ -c -o ${test_output_dir}/clean_two.o -I ./clean/include clean/two.c",
+  "file": "${test_input_dir}/clean/two.c"
+}
+,
+{
+  "directory": "${test_input_dir}/dirty",
+  "command": "cc -c -o ${test_output_dir}/dirty_one.o -Wall one.c",
+  "file": "${test_input_dir}/dirty/one.c"
+}
+,
+{
+  "directory": "${test_input_dir}",
+  "command": "c++ -c -o ${test_output_dir}/dirty_two.o -Wall dirty/two.c",
+  "file": "${test_input_dir}/dirty/two.c"
+}
+]
+EOF
\ No newline at end of file
diff --git a/tests/functional/cases/report/report_dir_empty_cleaned.ft b/tests/functional/cases/report/report_dir_empty_cleaned.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_dir_empty_kept.ft b/tests/functional/cases/report/report_dir_empty_kept.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_dir_kept.ft b/tests/functional/cases/report/report_dir_kept.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_failures.ft b/tests/functional/cases/report/report_failures.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_failures_disabled.ft b/tests/functional/cases/report/report_failures_disabled.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_file_for_html.ft b/tests/functional/cases/report/report_file_for_html.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_file_for_plist.ft b/tests/functional/cases/report/report_file_for_plist.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_file_for_plist_html.ft b/tests/functional/cases/report/report_file_for_plist_html.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_tile_default.ft b/tests/functional/cases/report/report_tile_default.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/report/report_title_set.ft b/tests/functional/cases/report/report_title_set.ft
new file mode 100644
index 0000000..e69de29
diff --git a/tests/functional/cases/test_create_cdb.py b/tests/functional/cases/test_create_cdb.py
deleted file mode 100644
index c90cbee..0000000
--- a/tests/functional/cases/test_create_cdb.py
+++ /dev/null
@@ -1,195 +0,0 @@
-# -*- coding: utf-8 -*-
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-
-import libear
-from . import make_args, silent_check_call, silent_call, create_empty_file
-import unittest
-
-import os.path
-import json
-
-
-class CompilationDatabaseTest(unittest.TestCase):
-    @staticmethod
-    def run_intercept(tmpdir, args):
-        result = os.path.join(tmpdir, 'cdb.json')
-        make = make_args(tmpdir) + args
-        silent_check_call(
-            ['intercept-build', '--cdb', result] + make)
-        return result
-
-    @staticmethod
-    def count_entries(filename):
-        with open(filename, 'r') as handler:
-            content = json.load(handler)
-            return len(content)
-
-    def test_successful_build(self):
-        with libear.temporary_directory() as tmpdir:
-            result = self.run_intercept(tmpdir, ['build_regular'])
-            self.assertTrue(os.path.isfile(result))
-            self.assertEqual(5, self.count_entries(result))
-
-    def test_successful_build_with_wrapper(self):
-        with libear.temporary_directory() as tmpdir:
-            result = os.path.join(tmpdir, 'cdb.json')
-            make = make_args(tmpdir) + ['build_regular']
-            silent_check_call(['intercept-build', '--cdb', result,
-                               '--override-compiler'] + make)
-            self.assertTrue(os.path.isfile(result))
-            self.assertEqual(5, self.count_entries(result))
-
-    @unittest.skipIf(os.getenv('TRAVIS'), 'ubuntu make return -11')
-    def test_successful_build_parallel(self):
-        with libear.temporary_directory() as tmpdir:
-            result = self.run_intercept(tmpdir, ['-j', '4', 'build_regular'])
-            self.assertTrue(os.path.isfile(result))
-            self.assertEqual(5, self.count_entries(result))
-
-    @unittest.skipIf(os.getenv('TRAVIS'), 'ubuntu env remove clang from path')
-    def test_successful_build_on_empty_env(self):
-        with libear.temporary_directory() as tmpdir:
-            result = os.path.join(tmpdir, 'cdb.json')
-            make = make_args(tmpdir) + ['CC=clang', 'build_regular']
-            silent_check_call(['intercept-build', '--cdb', result,
-                               'env', '-'] + make)
-            self.assertTrue(os.path.isfile(result))
-            self.assertEqual(5, self.count_entries(result))
-
-    def test_successful_build_all_in_one(self):
-        with libear.temporary_directory() as tmpdir:
-            result = self.run_intercept(tmpdir, ['build_all_in_one'])
-            self.assertTrue(os.path.isfile(result))
-            self.assertEqual(5, self.count_entries(result))
-
-    def test_not_successful_build(self):
-        with libear.temporary_directory() as tmpdir:
-            result = os.path.join(tmpdir, 'cdb.json')
-            make = make_args(tmpdir) + ['build_broken']
-            silent_call(
-                ['intercept-build', '--cdb', result] + make)
-            self.assertTrue(os.path.isfile(result))
-            self.assertEqual(2, self.count_entries(result))
-
-
-class ExitCodeTest(unittest.TestCase):
-    @staticmethod
-    def run_intercept(tmpdir, target):
-        result = os.path.join(tmpdir, 'cdb.json')
-        make = make_args(tmpdir) + [target]
-        return silent_call(
-            ['intercept-build', '--cdb', result] + make)
-
-    def test_successful_build(self):
-        with libear.temporary_directory() as tmpdir:
-            exitcode = self.run_intercept(tmpdir, 'build_clean')
-            self.assertFalse(exitcode)
-
-    def test_not_successful_build(self):
-        with libear.temporary_directory() as tmpdir:
-            exitcode = self.run_intercept(tmpdir, 'build_broken')
-            self.assertTrue(exitcode)
-
-    def test_intercept_help(self):
-        exitcode = silent_call(['intercept-build', '--help'])
-        self.assertFalse(exitcode)
-
-
-class ResumeFeatureTest(unittest.TestCase):
-    @staticmethod
-    def run_intercept(tmpdir, target, args):
-        result = os.path.join(tmpdir, 'cdb.json')
-        make = make_args(tmpdir) + [target]
-        silent_check_call(
-            ['intercept-build', '--cdb', result] + args + make)
-        return result
-
-    @staticmethod
-    def count_entries(filename):
-        with open(filename, 'r') as handler:
-            content = json.load(handler)
-            return len(content)
-
-    def test_overwrite_existing_cdb(self):
-        with libear.temporary_directory() as tmpdir:
-            result = self.run_intercept(tmpdir, 'build_clean', [])
-            self.assertTrue(os.path.isfile(result))
-            result = self.run_intercept(tmpdir, 'build_regular', [])
-            self.assertTrue(os.path.isfile(result))
-            self.assertEqual(2, self.count_entries(result))
-
-    def test_append_to_existing_cdb(self):
-        with libear.temporary_directory() as tmpdir:
-            result = self.run_intercept(tmpdir, 'build_clean', [])
-            self.assertTrue(os.path.isfile(result))
-            result = self.run_intercept(tmpdir, 'build_regular', ['--append'])
-            self.assertTrue(os.path.isfile(result))
-            self.assertEqual(5, self.count_entries(result))
-
-
-class ResultFormatingTest(unittest.TestCase):
-    @staticmethod
-    def run_intercept(tmpdir, command):
-        result = os.path.join(tmpdir, 'cdb.json')
-        silent_check_call(
-            ['intercept-build', '--cdb', result] + command,
-            cwd=tmpdir)
-        with open(result, 'r') as handler:
-            content = json.load(handler)
-            return content
-
-    def assert_creates_number_of_entries(self, command, count):
-        with libear.temporary_directory() as tmpdir:
-            filename = os.path.join(tmpdir, 'test.c')
-            create_empty_file(filename)
-            command.append(filename)
-            cmd = ['sh', '-c', ' '.join(command)]
-            cdb = self.run_intercept(tmpdir, cmd)
-            self.assertEqual(count, len(cdb))
-
-    def test_filter_preprocessor_only_calls(self):
-        self.assert_creates_number_of_entries(['cc', '-c'], 1)
-        self.assert_creates_number_of_entries(['cc', '-c', '-E'], 0)
-        self.assert_creates_number_of_entries(['cc', '-c', '-M'], 0)
-        self.assert_creates_number_of_entries(['cc', '-c', '-MM'], 0)
-
-    def assert_command_creates_entry(self, command, expected):
-        with libear.temporary_directory() as tmpdir:
-            filename = os.path.join(tmpdir, command[-1])
-            create_empty_file(filename)
-            cmd = ['sh', '-c', ' '.join(command)]
-            cdb = self.run_intercept(tmpdir, cmd)
-            self.assertEqual(' '.join(expected), cdb[0]['command'])
-
-    def test_filter_preprocessor_flags(self):
-        self.assert_command_creates_entry(
-            ['cc', '-c', '-MD', 'test.c'],
-            ['cc', '-c', 'test.c'])
-        self.assert_command_creates_entry(
-            ['cc', '-c', '-MMD', 'test.c'],
-            ['cc', '-c', 'test.c'])
-        self.assert_command_creates_entry(
-            ['cc', '-c', '-MD', '-MF', 'test.d', 'test.c'],
-            ['cc', '-c', 'test.c'])
-
-    def test_pass_language_flag(self):
-        self.assert_command_creates_entry(
-            ['cc', '-c', '-x', 'c', 'test.c'],
-            ['cc', '-c', '-x', 'c', 'test.c'])
-        self.assert_command_creates_entry(
-            ['cc', '-c', 'test.c'],
-            ['cc', '-c', 'test.c'])
-
-    def test_pass_arch_flags(self):
-        self.assert_command_creates_entry(
-            ['clang', '-c', 'test.c'],
-            ['cc', '-c', 'test.c'])
-        self.assert_command_creates_entry(
-            ['clang', '-c', '-arch', 'i386', 'test.c'],
-            ['cc', '-c', '-arch', 'i386', 'test.c'])
-        self.assert_command_creates_entry(
-            ['clang', '-c', '-arch', 'i386', '-arch', 'armv7l', 'test.c'],
-            ['cc', '-c', '-arch', 'i386', '-arch', 'armv7l', 'test.c'])
diff --git a/tests/functional/cases/test_exec_anatomy.py b/tests/functional/cases/test_exec_anatomy.py
deleted file mode 100644
index 89ec51e..0000000
--- a/tests/functional/cases/test_exec_anatomy.py
+++ /dev/null
@@ -1,50 +0,0 @@
-# -*- coding: utf-8 -*-
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-
-import libear
-import unittest
-
-import os.path
-import subprocess
-import json
-
-
-def run(source_dir, target_dir):
-    def execute(cmd):
-        return subprocess.check_call(cmd,
-                                     cwd=target_dir,
-                                     stdout=subprocess.PIPE,
-                                     stderr=subprocess.STDOUT)
-
-    execute(['cmake', source_dir])
-    execute(['make'])
-
-    result_file = os.path.join(target_dir, 'result.json')
-    expected_file = os.path.join(target_dir, 'expected.json')
-    execute(['intercept-build', '--cdb', result_file, './exec',
-             expected_file])
-    return expected_file, result_file
-
-
-class ExecAnatomyTest(unittest.TestCase):
-    def assertEqualJson(self, expected, result):
-        def read_json(filename):
-            with open(filename) as handler:
-                return json.load(handler)
-
-        lhs = read_json(expected)
-        rhs = read_json(result)
-        for item in lhs:
-            self.assertTrue(rhs.count(item))
-        for item in rhs:
-            self.assertTrue(lhs.count(item))
-
-    def test_all_exec_calls(self):
-        this_dir, _ = os.path.split(__file__)
-        source_dir = os.path.normpath(os.path.join(this_dir, '..', 'exec'))
-        with libear.temporary_directory() as tmp_dir:
-            expected, result = run(source_dir, tmp_dir)
-            self.assertEqualJson(expected, result)
diff --git a/tests/functional/cases/test_from_cdb.py b/tests/functional/cases/test_from_cdb.py
deleted file mode 100644
index 33f0c34..0000000
--- a/tests/functional/cases/test_from_cdb.py
+++ /dev/null
@@ -1,182 +0,0 @@
-# -*- coding: utf-8 -*-
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-
-import libear
-from . import call_and_report
-import unittest
-
-import os.path
-import string
-import glob
-
-
-def prepare_cdb(name, target_dir):
-    target_file = 'build_{0}.json'.format(name)
-    this_dir, _ = os.path.split(__file__)
-    path = os.path.normpath(os.path.join(this_dir, '..', 'src'))
-    source_dir = os.path.join(path, 'compilation_database')
-    source_file = os.path.join(source_dir, target_file + '.in')
-    target_file = os.path.join(target_dir, 'compile_commands.json')
-    with open(source_file, 'r') as in_handle:
-        with open(target_file, 'w') as out_handle:
-            for line in in_handle:
-                temp = string.Template(line)
-                out_handle.write(temp.substitute(path=path))
-    return target_file
-
-
-def run_analyzer(directory, cdb, args):
-    cmd = ['analyze-build', '--cdb', cdb, '--output', directory] \
-        + args
-    return call_and_report(cmd, [])
-
-
-class OutputDirectoryTest(unittest.TestCase):
-    def test_regular_keeps_report_dir(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('regular', tmpdir)
-            exit_code, reportdir = run_analyzer(tmpdir, cdb, [])
-            self.assertTrue(os.path.isdir(reportdir))
-
-    def test_clear_deletes_report_dir(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('clean', tmpdir)
-            exit_code, reportdir = run_analyzer(tmpdir, cdb, [])
-            self.assertFalse(os.path.isdir(reportdir))
-
-    def test_clear_keeps_report_dir_when_asked(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('clean', tmpdir)
-            exit_code, reportdir = run_analyzer(tmpdir, cdb, ['--keep-empty'])
-            self.assertTrue(os.path.isdir(reportdir))
-
-
-class ExitCodeTest(unittest.TestCase):
-    def test_regular_does_not_set_exit_code(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('regular', tmpdir)
-            exit_code, __ = run_analyzer(tmpdir, cdb, [])
-            self.assertFalse(exit_code)
-
-    def test_clear_does_not_set_exit_code(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('clean', tmpdir)
-            exit_code, __ = run_analyzer(tmpdir, cdb, [])
-            self.assertFalse(exit_code)
-
-    def test_regular_sets_exit_code_if_asked(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('regular', tmpdir)
-            exit_code, __ = run_analyzer(tmpdir, cdb, ['--status-bugs'])
-            self.assertTrue(exit_code)
-
-    def test_clear_does_not_set_exit_code_if_asked(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('clean', tmpdir)
-            exit_code, __ = run_analyzer(tmpdir, cdb, ['--status-bugs'])
-            self.assertFalse(exit_code)
-
-    def test_regular_sets_exit_code_if_asked_from_plist(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('regular', tmpdir)
-            exit_code, __ = run_analyzer(
-                tmpdir, cdb, ['--status-bugs', '--plist'])
-            self.assertTrue(exit_code)
-
-    def test_clear_does_not_set_exit_code_if_asked_from_plist(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('clean', tmpdir)
-            exit_code, __ = run_analyzer(
-                tmpdir, cdb, ['--status-bugs', '--plist'])
-            self.assertFalse(exit_code)
-
-
-class OutputFormatTest(unittest.TestCase):
-    @staticmethod
-    def get_html_count(directory):
-        return len(glob.glob(os.path.join(directory, 'report-*.html')))
-
-    @staticmethod
-    def get_plist_count(directory):
-        return len(glob.glob(os.path.join(directory, 'report-*.plist')))
-
-    def test_default_creates_html_report(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('regular', tmpdir)
-            exit_code, reportdir = run_analyzer(tmpdir, cdb, [])
-            self.assertTrue(
-                os.path.exists(os.path.join(reportdir, 'index.html')))
-            self.assertEqual(self.get_html_count(reportdir), 2)
-            self.assertEqual(self.get_plist_count(reportdir), 0)
-
-    def test_plist_and_html_creates_html_report(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('regular', tmpdir)
-            exit_code, reportdir = run_analyzer(tmpdir, cdb, ['--plist-html'])
-            self.assertTrue(
-                os.path.exists(os.path.join(reportdir, 'index.html')))
-            self.assertEqual(self.get_html_count(reportdir), 2)
-            self.assertEqual(self.get_plist_count(reportdir), 5)
-
-    def test_plist_does_not_creates_html_report(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('regular', tmpdir)
-            exit_code, reportdir = run_analyzer(tmpdir, cdb, ['--plist'])
-            self.assertFalse(
-                os.path.exists(os.path.join(reportdir, 'index.html')))
-            self.assertEqual(self.get_html_count(reportdir), 0)
-            self.assertEqual(self.get_plist_count(reportdir), 5)
-
-
-class FailureReportTest(unittest.TestCase):
-    def test_broken_creates_failure_reports(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('broken', tmpdir)
-            exit_code, reportdir = run_analyzer(tmpdir, cdb, [])
-            self.assertTrue(
-                os.path.isdir(os.path.join(reportdir, 'failures')))
-
-    def test_broken_does_not_creates_failure_reports(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('broken', tmpdir)
-            exit_code, reportdir = run_analyzer(
-                tmpdir, cdb, ['--no-failure-reports'])
-            self.assertFalse(
-                os.path.isdir(os.path.join(reportdir, 'failures')))
-
-
-class TitleTest(unittest.TestCase):
-    def assertTitleEqual(self, directory, expected):
-        import re
-        patterns = [
-            re.compile(r'<title>(?P<page>.*)</title>'),
-            re.compile(r'<h1>(?P<head>.*)</h1>')
-        ]
-        result = dict()
-
-        index = os.path.join(directory, 'index.html')
-        with open(index, 'r') as handler:
-            for line in handler.readlines():
-                for regex in patterns:
-                    match = regex.match(line.strip())
-                    if match:
-                        result.update(match.groupdict())
-                        break
-        self.assertEqual(result['page'], result['head'])
-        self.assertEqual(result['page'], expected)
-
-    def test_default_title_in_report(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('broken', tmpdir)
-            exit_code, reportdir = run_analyzer(tmpdir, cdb, [])
-            self.assertTitleEqual(reportdir, 'src - analyzer results')
-
-    def test_given_title_in_report(self):
-        with libear.temporary_directory() as tmpdir:
-            cdb = prepare_cdb('broken', tmpdir)
-            exit_code, reportdir = run_analyzer(
-                tmpdir, cdb, ['--html-title', 'this is the title'])
-            self.assertTitleEqual(reportdir, 'this is the title')
diff --git a/tests/functional/cases/test_from_cmd.py b/tests/functional/cases/test_from_cmd.py
deleted file mode 100644
index e28461d..0000000
--- a/tests/functional/cases/test_from_cmd.py
+++ /dev/null
@@ -1,118 +0,0 @@
-# -*- coding: utf-8 -*-
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-
-import libear
-from . import make_args, check_call_and_report, create_empty_file
-import unittest
-
-import os
-import os.path
-import glob
-
-
-class OutputDirectoryTest(unittest.TestCase):
-
-    @staticmethod
-    def run_analyzer(outdir, args, cmd):
-        return check_call_and_report(
-            ['scan-build', '--intercept-first', '-o', outdir] + args,
-            cmd)
-
-    def test_regular_keeps_report_dir(self):
-        with libear.temporary_directory() as tmpdir:
-            make = make_args(tmpdir) + ['build_regular']
-            outdir = self.run_analyzer(tmpdir, [], make)
-            self.assertTrue(os.path.isdir(outdir))
-
-    def test_clear_deletes_report_dir(self):
-        with libear.temporary_directory() as tmpdir:
-            make = make_args(tmpdir) + ['build_clean']
-            outdir = self.run_analyzer(tmpdir, [], make)
-            self.assertFalse(os.path.isdir(outdir))
-
-    def test_clear_keeps_report_dir_when_asked(self):
-        with libear.temporary_directory() as tmpdir:
-            make = make_args(tmpdir) + ['build_clean']
-            outdir = self.run_analyzer(tmpdir, ['--keep-empty'], make)
-            self.assertTrue(os.path.isdir(outdir))
-
-
-class RunAnalyzerTest(unittest.TestCase):
-
-    @staticmethod
-    def get_plist_count(directory):
-        return len(glob.glob(os.path.join(directory, 'report-*.plist')))
-
-    def test_interposition_works(self):
-        with libear.temporary_directory() as tmpdir:
-            make = make_args(tmpdir) + ['build_regular']
-            outdir = check_call_and_report(
-                ['scan-build', '--plist', '-o', tmpdir, '--override-compiler'],
-                make)
-
-            self.assertTrue(os.path.isdir(outdir))
-            self.assertEqual(self.get_plist_count(outdir), 5)
-
-    def test_intercept_wrapper_works(self):
-        with libear.temporary_directory() as tmpdir:
-            make = make_args(tmpdir) + ['build_regular']
-            outdir = check_call_and_report(
-                ['scan-build', '--plist', '-o', tmpdir, '--intercept-first',
-                 '--override-compiler'],
-                make)
-
-            self.assertTrue(os.path.isdir(outdir))
-            self.assertEqual(self.get_plist_count(outdir), 5)
-
-    def test_intercept_library_works(self):
-        with libear.temporary_directory() as tmpdir:
-            make = make_args(tmpdir) + ['build_regular']
-            outdir = check_call_and_report(
-                ['scan-build', '--plist', '-o', tmpdir, '--intercept-first'],
-                make)
-
-            self.assertTrue(os.path.isdir(outdir))
-            self.assertEqual(self.get_plist_count(outdir), 5)
-
-    @staticmethod
-    def compile_empty_source_file(target_dir, is_cxx):
-        compiler = '$CXX' if is_cxx else '$CC'
-        src_file_name = 'test.cxx' if is_cxx else 'test.c'
-        src_file = os.path.join(target_dir, src_file_name)
-        obj_file = os.path.join(target_dir, 'test.o')
-        create_empty_file(src_file)
-        command = ' '.join([compiler, '-c', src_file, '-o', obj_file])
-        return ['sh', '-c', command]
-
-    def test_interposition_cc_works(self):
-        with libear.temporary_directory() as tmpdir:
-            outdir = check_call_and_report(
-                ['scan-build', '--plist', '-o', tmpdir, '--override-compiler'],
-                self.compile_empty_source_file(tmpdir, False))
-            self.assertEqual(self.get_plist_count(outdir), 1)
-
-    def test_interposition_cxx_works(self):
-        with libear.temporary_directory() as tmpdir:
-            outdir = check_call_and_report(
-                ['scan-build', '--plist', '-o', tmpdir, '--override-compiler'],
-                self.compile_empty_source_file(tmpdir, True))
-            self.assertEqual(self.get_plist_count(outdir), 1)
-
-    def test_intercept_cc_works(self):
-        with libear.temporary_directory() as tmpdir:
-            outdir = check_call_and_report(
-                ['scan-build', '--plist', '-o', tmpdir, '--override-compiler',
-                 '--intercept-first'],
-                self.compile_empty_source_file(tmpdir, False))
-            self.assertEqual(self.get_plist_count(outdir), 1)
-
-    def test_intercept_cxx_works(self):
-        with libear.temporary_directory() as tmpdir:
-            outdir = check_call_and_report(
-                ['scan-build', '--plist', '-o', tmpdir, '--override-compiler',
-                 '--intercept-first'],
-                self.compile_empty_source_file(tmpdir, True))
-            self.assertEqual(self.get_plist_count(outdir), 1)
diff --git a/tests/functional/lit.local.cfg b/tests/functional/lit.local.cfg
new file mode 100644
index 0000000..d247d41
--- /dev/null
+++ b/tests/functional/lit.local.cfg
@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+
+import os.path
+import lit.util
+
+# test_source_root: The root path where tests are located.
+this_dir = os.path.dirname(__file__)
+bin_dir = os.path.join(this_dir, 'bin')
+
+config.environment['PATH'] = ':'.join([bin_dir, config.environment['PATH']])
+config.environment['CC'] = 'cc'
+config.environment['CXX'] = 'c++'
+config.environment['test_input_dir'] = os.path.join(this_dir, 'Input')
+config.environment['test_output_dir'] = os.path.join(this_dir, 'Output')
diff --git a/tests/functional/src/build/Makefile b/tests/functional/src/build/Makefile
deleted file mode 100644
index a8c0aaf..0000000
--- a/tests/functional/src/build/Makefile
+++ /dev/null
@@ -1,42 +0,0 @@
-SRCDIR := ..
-OBJDIR := .
-
-CFLAGS = -Wall -DDEBUG -Dvariable="value with space" -I $(SRCDIR)/include
-LDFLAGS =
-PROGRAM = $(OBJDIR)/prg
-
-$(OBJDIR)/main.o: $(SRCDIR)/main.c
-	$(CC) $(CFLAGS) -c -o $@ $(SRCDIR)/main.c
-
-$(OBJDIR)/clean-one.o: $(SRCDIR)/clean-one.c
-	$(CC) $(CFLAGS) -c -o $@ $(SRCDIR)/clean-one.c
-
-$(OBJDIR)/clean-two.o: $(SRCDIR)/clean-two.c
-	$(CC) $(CFLAGS) -c -o $@ $(SRCDIR)/clean-two.c
-
-$(OBJDIR)/emit-one.o: $(SRCDIR)/emit-one.c
-	$(CC) $(CFLAGS) -c -o $@ $(SRCDIR)/emit-one.c
-
-$(OBJDIR)/emit-two.o: $(SRCDIR)/emit-two.c
-	$(CC) $(CFLAGS) -c -o $@ $(SRCDIR)/emit-two.c
-
-$(OBJDIR)/broken-one.o: $(SRCDIR)/broken-one.c
-	$(CC) $(CFLAGS) -c -o $@ $(SRCDIR)/broken-one.c
-
-$(OBJDIR)/broken-two.o: $(SRCDIR)/broken-two.c
-	$(CC) $(CFLAGS) -c -o $@ $(SRCDIR)/broken-two.c
-
-$(PROGRAM): $(OBJDIR)/main.o $(OBJDIR)/clean-one.o $(OBJDIR)/clean-two.o $(OBJDIR)/emit-one.o $(OBJDIR)/emit-two.o
-	$(CC) $(LDFLAGS) -o $@ $(OBJDIR)/main.o $(OBJDIR)/clean-one.o $(OBJDIR)/clean-two.o $(OBJDIR)/emit-one.o $(OBJDIR)/emit-two.o
-
-build_regular: $(PROGRAM)
-
-build_clean: $(OBJDIR)/main.o $(OBJDIR)/clean-one.o $(OBJDIR)/clean-two.o
-
-build_broken: $(OBJDIR)/main.o $(OBJDIR)/broken-one.o $(OBJDIR)/broken-two.o
-
-build_all_in_one: $(SRCDIR)/main.c $(SRCDIR)/clean-one.c $(SRCDIR)/clean-two.c $(SRCDIR)/emit-one.c $(SRCDIR)/emit-two.c
-	$(CC) $(CFLAGS) $(LDFLAGS) -o $(PROGRAM) $(SRCDIR)/main.c $(SRCDIR)/clean-one.c $(SRCDIR)/clean-two.c $(SRCDIR)/emit-one.c $(SRCDIR)/emit-two.c
-
-clean:
-	rm -f $(PROGRAM) $(OBJDIR)/*.o
diff --git a/tests/functional/src/compilation_database/build_broken.json.in b/tests/functional/src/compilation_database/build_broken.json.in
deleted file mode 100644
index 104a419..0000000
--- a/tests/functional/src/compilation_database/build_broken.json.in
+++ /dev/null
@@ -1,43 +0,0 @@
-[
-{
-  "directory": "${path}",
-  "command": "g++ -c -o main.o main.c -Wall -DDEBUG -Dvariable=value",
-  "file": "${path}/main.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "cc -c -o broken-one.o broken-one.c -Wall -DDEBUG \"-Dvariable=value with space\"",
-  "file": "${path}/broken-one.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "g++ -c -o broken-two.o broken-two.c -Wall -DDEBUG -Dvariable=value",
-  "file": "${path}/broken-two.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "cc -c -o clean-one.o clean-one.c -Wall -DDEBUG \"-Dvariable=value with space\" -Iinclude",
-  "file": "${path}/clean-one.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "g++ -c -o clean-two.o clean-two.c -Wall -DDEBUG -Dvariable=value -I ./include",
-  "file": "${path}/clean-two.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "cc -c -o emit-one.o emit-one.c -Wall -DDEBUG \"-Dvariable=value with space\"",
-  "file": "${path}/emit-one.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "g++ -c -o emit-two.o emit-two.c -Wall -DDEBUG -Dvariable=value",
-  "file": "${path}/emit-two.c"
-}
-]
diff --git a/tests/functional/src/compilation_database/build_regular.json.in b/tests/functional/src/compilation_database/build_regular.json.in
deleted file mode 100644
index 0200c1d..0000000
--- a/tests/functional/src/compilation_database/build_regular.json.in
+++ /dev/null
@@ -1,31 +0,0 @@
-[
-{
-  "directory": "${path}",
-  "command": "g++ -c -o main.o main.c -Wall -DDEBUG -Dvariable=value",
-  "file": "${path}/main.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "cc -c -o clean-one.o clean-one.c -Wall -DDEBUG \"-Dvariable=value with space\" -Iinclude",
-  "file": "${path}/clean-one.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "g++ -c -o clean-two.o clean-two.c -Wall -DDEBUG -Dvariable=value -I ./include",
-  "file": "${path}/clean-two.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "cc -c -o emit-one.o emit-one.c -Wall -DDEBUG \"-Dvariable=value with space\"",
-  "file": "${path}/emit-one.c"
-}
-,
-{
-  "directory": "${path}",
-  "command": "g++ -c -o emit-two.o emit-two.c -Wall -DDEBUG -Dvariable=value",
-  "file": "${path}/emit-two.c"
-}
-]
diff --git a/tests/lit.cfg b/tests/lit.cfg
new file mode 100644
index 0000000..a2f1b25
--- /dev/null
+++ b/tests/lit.cfg
@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+
+import sys
+import os
+import os.path
+import subprocess
+import lit.util
+
+this_dir = os.path.dirname(__file__)
+project_dir = os.path.dirname(this_dir)
+bin_dir = os.path.join(project_dir, 'bin')
+
+config.name = 'scan-build'
+
+config.test_format = lit.formats.ShTest()
+config.test_exec_root = this_dir
+config.test_source_root = this_dir
+
+config.suffixes = ['.sh', '.py']
+config.excludes = ['Input']
+
+config.substitutions.append(('%{python}', sys.executable))
+
+config.environment['PATH'] = ':'.join([bin_dir, os.environ['PATH']])
+
+
+# check pep8 util is available
+try:
+    subprocess.call(['pep8', '--version'], stdout=subprocess.PIPE)
+except:
+    pass
+else:
+    config.available_features.add('pep8')
+
+# check for library preload is available
+sys.path.append(project_dir)
+from libscanbuild.intercept import is_preload_disabled
+if not is_preload_disabled(sys.platform):
+    config.available_features.add('preload')
\ No newline at end of file
diff --git a/tests/run_pep8.sh b/tests/run_pep8.sh
new file mode 100644
index 0000000..14a0fdb
--- /dev/null
+++ b/tests/run_pep8.sh
@@ -0,0 +1,5 @@
+# REQUIRES: pep8
+# RUN: pep8 --show-source --show-pep8 .
+# RUN: pep8 --show-source --show-pep8 ../bin
+# RUN: pep8 --show-source --show-pep8 ../libscanbuild
+# RUN: pep8 --show-source --show-pep8 ../libear
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
deleted file mode 100644
index dc8bf12..0000000
--- a/tests/unit/__init__.py
+++ /dev/null
@@ -1,26 +0,0 @@
-# -*- coding: utf-8 -*-
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-
-from . import test_libear
-from . import test_compilation
-from . import test_clang
-from . import test_runner
-from . import test_report
-from . import test_analyze
-from . import test_intercept
-from . import test_shell
-
-
-def load_tests(loader, suite, _):
-    suite.addTests(loader.loadTestsFromModule(test_libear))
-    suite.addTests(loader.loadTestsFromModule(test_compilation))
-    suite.addTests(loader.loadTestsFromModule(test_clang))
-    suite.addTests(loader.loadTestsFromModule(test_runner))
-    suite.addTests(loader.loadTestsFromModule(test_report))
-    suite.addTests(loader.loadTestsFromModule(test_analyze))
-    suite.addTests(loader.loadTestsFromModule(test_intercept))
-    suite.addTests(loader.loadTestsFromModule(test_shell))
-    return suite
diff --git a/tests/unit/lit.local.cfg b/tests/unit/lit.local.cfg
new file mode 100644
index 0000000..e92d094
--- /dev/null
+++ b/tests/unit/lit.local.cfg
@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+
+import os.path
+import lit.util
+
+# test_source_root: The root path where tests are located.
+this_dir = os.path.dirname(__file__)
+parent_dir = os.path.dirname(this_dir)
+project_dir = os.path.dirname(parent_dir)
+
+
+config.environment['PYTHONPATH'] = project_dir
diff --git a/tests/unit/test_analyze.py b/tests/unit/test_analyze.py
deleted file mode 100644
index 481cc0c..0000000
--- a/tests/unit/test_analyze.py
+++ /dev/null
@@ -1,7 +0,0 @@
-# -*- coding: utf-8 -*-
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-
-import libscanbuild.analyze as sut
diff --git a/tests/unit/test_clang.py b/tests/unit/test_clang.py
index c1fa040..4ad055a 100644
--- a/tests/unit/test_clang.py
+++ b/tests/unit/test_clang.py
@@ -3,6 +3,8 @@
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
+#
+# RUN: %{python} %s
 
 import libear
 import libscanbuild.clang as sut
@@ -92,3 +94,7 @@ class ClangGetCheckersTest(unittest.TestCase):
         self.assertEqual('Checker One description', result.get('checker.one'))
         self.assertTrue('checker.two' in result)
         self.assertEqual('Checker Two description', result.get('checker.two'))
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/unit/test_compilation.py b/tests/unit/test_compilation.py
index 6e9d7e3..3eeb3aa 100644
--- a/tests/unit/test_compilation.py
+++ b/tests/unit/test_compilation.py
@@ -3,6 +3,8 @@
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
+#
+# RUN: %{python} %s
 
 import libscanbuild.compilation as sut
 import unittest
@@ -158,3 +160,7 @@ class SourceClassifierTest(unittest.TestCase):
         self.assertEqual('c++', sut.classify_source('file.c', False))
         self.assertEqual('c++', sut.classify_source('./file.c', False))
         self.assertEqual('c++', sut.classify_source('/path/file.c', False))
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/unit/test_intercept.py b/tests/unit/test_intercept.py
index 94d67aa..ad24906 100644
--- a/tests/unit/test_intercept.py
+++ b/tests/unit/test_intercept.py
@@ -3,6 +3,8 @@
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
+#
+# RUN: %{python} %s
 
 import libear
 import libscanbuild.intercept as sut
@@ -109,3 +111,7 @@ class InterceptUtilTest(unittest.TestCase):
             self.assertFalse(sut.is_preload_disabled('unix'))
         finally:
             os.environ['PATH'] = saved
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/unit/test_libear.py b/tests/unit/test_libear.py
index 2db00d6..a677b2c 100644
--- a/tests/unit/test_libear.py
+++ b/tests/unit/test_libear.py
@@ -3,6 +3,8 @@
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
+#
+# RUN: %{python} %s
 
 import libear as sut
 import unittest
@@ -28,3 +30,7 @@ class TemporaryDirectoryTest(unittest.TestCase):
         except:
             self.assertIsNotNone(dir_name)
             self.assertFalse(os.path.exists(dir_name))
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/unit/test_report.py b/tests/unit/test_report.py
index 4b19d4c..674187c 100644
--- a/tests/unit/test_report.py
+++ b/tests/unit/test_report.py
@@ -3,6 +3,8 @@
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
+#
+# RUN: %{python} %s
 
 import libear
 import libscanbuild.report as sut
@@ -160,3 +162,7 @@ class ReportDirectoryTest(unittest.TestCase):
              sut.report_directory(tmp_dir, False) as report_dir3:
             self.assertLess(report_dir1, report_dir2)
             self.assertLess(report_dir2, report_dir3)
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/unit/test_runner.py b/tests/unit/test_runner.py
index e0fd89a..d004ebd 100644
--- a/tests/unit/test_runner.py
+++ b/tests/unit/test_runner.py
@@ -3,6 +3,8 @@
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
+#
+# RUN: %{python} %s
 
 import libear
 import libscanbuild.runner as sut
diff --git a/tests/unit/test_shell.py b/tests/unit/test_shell.py
index 2f696e3..5b33537 100644
--- a/tests/unit/test_shell.py
+++ b/tests/unit/test_shell.py
@@ -3,6 +3,8 @@
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
+#
+# RUN: %{python} %s
 
 import libscanbuild.shell as sut
 import unittest