Add basic infrastructure for unit testing

Tests will be written using the [moonscript](http://moonscript.org/) language,
a lua 'dialect' that is whitespace-significant and has a syntax similar to
coffeescript. The test framework used is [busted](http://olivinelabs.com/busted/),
a bdd framework for lua/moonscript.

Luajit has a nice ffi module, which lets lua programs link shared libraries and
call it's functions without writing any C code.

To take advantage of this fact for testing C functions, a new target was added
to CMakeLists.txt, which compiles neovim as a shared library that is loaded by
the process running the tests.

This commit adds necessary code for downloading and installing a lua package
manager(luarocks) locally. It wasn't added as a subtree because there are quite
a few blobs in its source tree.

8 files changed, 139 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index 128b1b1481..aa5c6380e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,5 +25,22 @@ src/testdir/*.failed
 src/testdir/X*
 src/testdir/valgrind.*
 
+# luarocks, not added as a subtree because of the large number of blobs
+third-party/luarocks
+
+# luajit files
+third-party/luajit/src/host/buildvm
+third-party/luajit/src/host/buildvm_arch.h
+third-party/luajit/src/host/minilua
+third-party/luajit/src/jit/vmdef.lua
+third-party/luajit/src/libluajit.a
+third-party/luajit/src/lj_bcdef.h
+third-party/luajit/src/lj_ffdef.h
+third-party/luajit/src/lj_folddef.h
+third-party/luajit/src/lj_libdef.h
+third-party/luajit/src/lj_recdef.h
+third-party/luajit/src/lj_vm.s
+third-party/luajit/src/luajit
+
 # local make targets
 local.mk
diff --git a/Makefile b/Makefile
index dcc8cc71ff..88c1364961 100644
--- a/Makefile
+++ b/Makefile
@@ -11,11 +11,20 @@ build/bin/nvim: deps
 test: build/bin/nvim
 	cd src/testdir && make
 
-deps: .deps/usr/lib/libuv.a
+unittest: build/bin/nvim
+	sh -e scripts/unittest.sh
+
+deps: .deps/usr/lib/libuv.a .deps/usr/lib/libluajit-5.1.a .deps/usr/bin/busted
 
 .deps/usr/lib/libuv.a:
 	sh -e scripts/compile-libuv.sh
 
+.deps/usr/lib/libluajit-5.1.a:
+	sh -e scripts/compile-lua.sh
+
+.deps/usr/bin/busted:
+	sh -e scripts/setup-test-tools.sh
+
 cmake: clean deps
 	mkdir build
 	cd build && cmake $(CMAKE_FLAGS) $(CMAKE_EXTRA_FLAGS) ../
diff --git a/scripts/compile-lua.sh b/scripts/compile-lua.sh
new file mode 100644
index 0000000000..9187c07877
--- /dev/null
+++ b/scripts/compile-lua.sh
@@ -0,0 +1,6 @@
+. scripts/common.sh
+
+lua_dir="$pkgroot/third-party/luajit"
+
+cd "$lua_dir"
+make PREFIX="$prefix" install
diff --git a/scripts/setup-test-tools.sh b/scripts/setup-test-tools.sh
new file mode 100644
index 0000000000..3e4a274f59
--- /dev/null
+++ b/scripts/setup-test-tools.sh
@@ -0,0 +1,22 @@
+. scripts/common.sh
+
+luarocks_ver=v2.1.2
+luarocks_repo=keplerproject/luarocks
+luarocks_sha1=69ea9b641a5066b1f316847494d8c63a4693977d
+luarocks_dir="$pkgroot/third-party/luarocks"
+
+github_download "$luarocks_repo" "$luarocks_ver" "$luarocks_dir" \
+	"$luarocks_sha1"
+
+cd "$luarocks_dir"
+
+./configure --prefix="$prefix" --force-config --with-lua="$prefix" \
+	--with-lua-include="$prefix/include/luajit-2.0" \
+	--lua-suffix="jit"
+
+make bootstrap
+
+# install tools for testing
+luarocks install moonrocks --server=http://rocks.moonscript.org
+moonrocks install moonscript
+moonrocks install busted
diff --git a/scripts/unittest.sh b/scripts/unittest.sh
new file mode 100644
index 0000000000..f792308275
--- /dev/null
+++ b/scripts/unittest.sh
@@ -0,0 +1,6 @@
+. scripts/common.sh
+
+(cd "$pkgroot/build" && make) || exit 1
+eval "$(luarocks path)"
+
+busted --pattern=.moon ./test
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8c19098f1e..aa1100032a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -13,6 +13,7 @@ list(APPEND NEOVIM_SOURCES "${PROJECT_BINARY_DIR}/config/auto/pathdef.c")
 file( GLOB OS_SOURCES os/*.c )
 
 add_executable (nvim ${NEOVIM_SOURCES} ${OS_SOURCES})
+add_library (nvim-test SHARED ${NEOVIM_SOURCES} ${OS_SOURCES}) 
 
 # The libraries we link against for nvim
 set(NVIM_LINK_LIBRARIES m ${LibUV_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
@@ -28,19 +29,23 @@ if (LibIntl_FOUND)
 endif()
 
 target_link_libraries (nvim ${NVIM_LINK_LIBRARIES})
+target_link_libraries (nvim-test ${NVIM_LINK_LIBRARIES})
 
 include(CheckLibraryExists)
 check_library_exists(termcap tgetent "" HAVE_LIBTERMCAP)
 
 if (HAVE_LIBTERMCAP)
   target_link_libraries(nvim termcap)
+  target_link_libraries(nvim-test termcap)
 else()
   check_library_exists(curses tgetent "" HAVE_LIBCURSES)
   if (HAVE_LIBCURSES)
     target_link_libraries(nvim curses)
+    target_link_libraries(nvim-test curses)
   else()
     find_package(Curses REQUIRED)
     target_link_libraries(nvim ${CURSES_LIBRARIES})
+    target_link_libraries(nvim-test ${CURSES_LIBRARIES})
   endif()
 endif()
 
diff --git a/test/unit/helpers.moon b/test/unit/helpers.moon
new file mode 100644
index 0000000000..5705db88a6
--- /dev/null
+++ b/test/unit/helpers.moon
@@ -0,0 +1,35 @@
+ffi = require 'ffi'
+
+-- load neovim shared library
+libnvim = ffi.load './build/src/libnvim-test.so'
+
+-- Luajit ffi parser only understands function signatures.
+-- This helper function normalizes headers, passes to ffi and returns the
+-- library pointer
+cimport = (path) ->
+  -- Can't parse some of vim types, perhaps need to define those before
+  -- automatically importing to ffi
+
+  -- header_file = io.open path, 'rb'
+  -- header = header_file\read '*a'
+  -- header_file.close!
+  -- header = string.gsub header, '#include[^\n]*\n', ''
+  -- header = string.gsub header, '#ifndef[^\n]*\n', ''
+  -- header = string.gsub header, '#define[^\n]*\n', ''
+  -- header = string.gsub header, '#endif[^\n]*\n', ''
+  -- ffi.cdef header
+
+  return libnvim
+
+-- take a pointer to a C-allocated string and return an interned
+-- version while also freeing the memory
+internalize = (cdata) ->
+  ffi.gc cdata, ffi.C.free
+  return ffi.string cdata
+
+return {
+  cimport: cimport
+  internalize: internalize
+  eq: (expected, actual) -> assert.are.same expected, actual
+  ffi: ffi
+}
diff --git a/test/unit/misc1.moon b/test/unit/misc1.moon
new file mode 100644
index 0000000000..dbcd192262
--- /dev/null
+++ b/test/unit/misc1.moon
@@ -0,0 +1,38 @@
+{:cimport, :internalize, :eq, :ffi} = require 'test.unit.helpers'
+
+misc1 = cimport './src/misc1.h'
+cstr = ffi.typeof 'char[?]'
+
+-- TODO extract constants from vim.h
+
+describe 'misc1 function', ->
+  describe 'fullpathcmp', ->
+    ffi.cdef 'int fullpathcmp(char *s1, char *s2, int checkname);'
+    fullpathcmp = (s1, s2, cn) ->
+      s1 = cstr (string.len s1) + 1, s1
+      s2 = cstr (string.len s2) + 1, s2
+      misc1.fullpathcmp s1, s2, cn or 0
+
+    f1 = 'f1.o'
+    f2 = 'f2.o'
+    f3 = 'test/f1.o'
+    FPC_SAME = 1
+    FPC_DIFF = 2
+    FPC_NOTX = 4
+    FPC_DIFFX = 6
+    FPC_SAMEX = 7
+
+    before_each ->
+      -- create the three files that will be used in this spec
+      (io.open f1, 'w').close!
+      (io.open f2, 'w').close!
+      (io.open f3, 'w').close!
+
+    after_each ->
+      os.remove f1
+      os.remove f2
+      os.remove f3
+    
+    it 'returns FPC_SAME when passed the same file', ->
+      eq FPC_SAME, (fullpathcmp f1, f1)
+