Add test for hitting max open files

tests/20_basic_read.tst

@@ -0,0 +1,25 @@
+#!/usr/bin/env testrunner.sh
+
+source "$(dirname "$0")/testhelpers.sh"
+
+mount_options="-o noreadbuf"
+
+function setup() {
+    read -r mount_dir dmg_file < <(mount_sparsebundle $mount_options)
+}
+
+function test_dmg_has_correct_number_of_blocks() {
+    _test_dmg_has_correct_number_of_blocks
+}
+
+function test_dmg_contents_is_same_as_testdata() {
+	_test_dmg_contents_is_same_as_testdata
+}
+
+function test_can_handle_ulimit() {
+	_test_can_handle_ulimit
+}
+
+function teardown() {
+    umount $mount_dir && rm -Rf $mount_dir
+}

tests/30_noreadbuf.tst

@@ -1,22 +0,0 @@
-#!/usr/bin/env testrunner.sh
-
-source "$(dirname "$0")/testhelpers.sh"
-
-function setup() {
-    read -r mount_dir dmg_file < <(mount_sparsebundle -o noreadbuf)
-}
-
-function test_dmg_has_correct_number_of_blocks() {
-    hfsdump $dmg_file | grep "total_blocks: 268435456"
-}
-
-function test_dmg_contents_is_same_as_testdata() {
-    for f in $(ls $HFSFUSE_DIR/src); do
-        echo "Diffing $HFSFUSE_DIR/src/$f"
-        diff $HFSFUSE_DIR/src/$f <(hfsdump $dmg_file read "/src/$f")
-    done
-}
-
-function teardown() {
-    umount $mount_dir && rm -Rf $mount_dir
-}

tests/30_zerocopy_read.tst

@@ -7,16 +7,17 @@ function setup() {
 }
 
 function test_dmg_has_correct_number_of_blocks() {
-    hfsdump $dmg_file | grep "total_blocks: 268435456"
+    _test_dmg_has_correct_number_of_blocks
 }
 
 function test_dmg_contents_is_same_as_testdata() {
-	for f in $(ls $HFSFUSE_DIR/src); do
-		echo "Diffing $HFSFUSE_DIR/src/$f"
-		diff $HFSFUSE_DIR/src/$f <(hfsdump $dmg_file read "/src/$f")
-	done
+    _test_dmg_contents_is_same_as_testdata
+}
+
+function test_can_handle_ulimit() {
+    _test_can_handle_ulimit
 }
 
 function teardown() {
     umount $mount_dir && rm -Rf $mount_dir
-}
+}

tests/testhelpers.sh

@@ -1,9 +1,16 @@
 
+sparsebundlefs_ulimit=
+
 function mount_sparsebundle() {
     test ! -z "$TEST_BUNDLE"
     local mount_dir=$(mktemp -d)
     local dmg_file="$mount_dir/sparsebundle.dmg"
-    sparsebundlefs -s -f -D $* $TEST_BUNDLE $mount_dir &
+    (
+        if [[ ! -z "${sparsebundlefs_ulimit}" ]]; then
+            ulimit -n $sparsebundlefs_ulimit
+        fi
+        sparsebundlefs -s -f -D $* $TEST_BUNDLE $mount_dir
+    ) &
     local pid=$!
     for i in {0..50}; do
         kill -0 $pid >/dev/null 2>&1
@@ -12,3 +19,40 @@ function mount_sparsebundle() {
 
     echo $mount_dir "$mount_dir/sparsebundle.dmg"
 }
+
+function _test_dmg_has_correct_number_of_blocks() {
+    hfsdump $dmg_file | grep "total_blocks: 268435456"
+}
+
+function _test_dmg_contents_is_same_as_testdata() {
+    for f in $(ls $HFSFUSE_DIR/src); do
+        echo "Diffing $HFSFUSE_DIR/src/$f"
+        diff $HFSFUSE_DIR/src/$f <(hfsdump $dmg_file read "/src/$f")
+    done
+}
+
+function _test_can_handle_ulimit() {
+    local mount_dir
+    local dmg_file
+
+
+    sparsebundlefs_ulimit=12
+    read -r mount_dir dmg_file < <(mount_sparsebundle $mount_options)
+    sparsebundlefs_ulimit=
+
+    hfs_dir=$(mktemp -d)
+    hfsfuse -f $dmg_file $hfs_dir &
+    local hfs_pid=$!
+    for i in {0..50}; do
+        kill -0 $hfs_pid >/dev/null 2>&1
+        test -f $hfs_dir/Makefile && break || sleep 0.1
+    done
+
+    for f in $(find $hfs_dir -type f); do
+        echo "Reading $f"
+        cat $f > /dev/null
+    done
+
+    umount $hfs_dir && rm -Rf $hfs_dir
+    umount $mount_dir && rm -Rf $mount_dir
+}