fix unit test with latest busted

.travis.yml

@@ -14,14 +14,13 @@ before_install:
 
 install:
     - sudo apt-get install libsdl1.2-dev luarocks nasm
-    - git clone https://github.com/Olivine-Labs/busted/
-    - cd busted && git checkout v1.10.0 && sudo luarocks make && cd ..
-    - sudo luarocks install luacov
+    - sudo luarocks install busted luacov
     - sudo luarocks install luacov-coveralls --server=http://rocks.moonscript.org/dev
 
 script:
     - make fetchthirdparty all
     - sudo cp base/build/*/luajit /usr/bin/
+    - sudo ln -sf /usr/bin/luajit /usr/bin/lua
     - make testfront
 
 after_success:

Makefile

@@ -93,14 +93,14 @@ $(INSTALL_DIR)/koreader/.luacov:
 		ln -sf ../../.luacov $(INSTALL_DIR)/koreader
 
 testfront: $(INSTALL_DIR)/koreader/.busted
-	cd $(INSTALL_DIR)/koreader && busted -l ./luajit
+	cd $(INSTALL_DIR)/koreader && busted
 
 test:
 	$(MAKE) -C $(KOR_BASE) test
 	$(MAKE) testfront
 
 coverage: $(INSTALL_DIR)/koreader/.luacov
-	cd $(INSTALL_DIR)/koreader && busted -c -l ./luajit --exclude-tags=nocov
+	cd $(INSTALL_DIR)/koreader && busted -c --exclude-tags=nocov
 	# coverage report summary
 	cd $(INSTALL_DIR)/koreader && tail -n \
 		+$$(($$(grep -nm1 Summary luacov.report.out|cut -d: -f1)-1)) \

spec/unit/document_spec.lua

@@ -3,6 +3,7 @@ local DocumentRegistry = require("document/documentregistry")
 
 describe("PDF document module", function()
     local sample_pdf = "spec/front/unit/data/tall.pdf"
+    local doc
     it("should open document", function()
         doc = DocumentRegistry:openDocument(sample_pdf)
         assert.truthy(doc)
@@ -38,6 +39,7 @@ end)
 
 describe("EPUB document module", function()
     local sample_epub = "spec/front/unit/data/leaves.epub"
+    local doc
     it("should open document", function()
         doc = DocumentRegistry:openDocument(sample_epub)
         assert.truthy(doc)