Ref/auto test runner (#11)

This PR:
- fixes the testfiles (previously it tried to find the root of the
project by `.git`, which isn't available under nix
- simplifies the implementation a bit (before we mapped each path to a
requirable and requried them, now we just `dofile`)
- adds auto test runner tests as well

lua/cpp-tools/auto_test_runner.lua → lua/cpp-tools/auto_test_runner/auto_test_runner.lua

@@ -3,18 +3,14 @@
 --- and runs their __test functions with busted test context.
 
 local current_filename = debug.getinfo(1).source:match('([%w_%.]+)$')
-local testfiles_dir = vim.fs.root(0, '.git') .. '/testfiles'
+local testfiles_dir = vim.fs.root(0, 'testfiles') .. '/testfiles'
 
 local function project_lua_files(path, type)
 	return type == 'file' and vim.endswith(path, 'lua') and not vim.endswith(path, current_filename)
 end
 
-local function path_to_requirable(path)
-	return path:match('lua/(.*)'):gsub('/init%.lua', ''):gsub('%.lua', ''):gsub('/', '.')
-end
-
 local function run_module_test(name)
-	local ok, module = pcall(require, name)
+	local ok, module = pcall(dofile, name)
 	if not ok then
 		describe(name, function()
 			it('Has an error!', function()
@@ -39,8 +35,4 @@ local function is_lua_dir(dir)
 	return vim.startswith(dir, 'lua')
 end
 
-vim
-	.iter(vim.fs.dir('.', { depth = 10, skip = is_lua_dir }))
-	:filter(project_lua_files)
-	:map(path_to_requirable)
-	:each(run_module_test)
+vim.iter(vim.fs.dir('.', { depth = 10, skip = is_lua_dir })):filter(project_lua_files):each(run_module_test)

lua/cpp-tools/auto_test_runner/test.lua

@@ -0,0 +1,23 @@
+--- For some reason when I define the tests in the main runner the busted context cannot be found,
+--- so I just created another file for that.
+
+local M = {}
+
+---@package
+function M.__test(testfiles_dir)
+	describe('auto test runner', function()
+		it('returns a proper testfiles dir', function()
+			local file = testfiles_dir .. '/auto_test_runner/test.txt'
+			print(file)
+			local f, msg = io.open(file)
+
+			if not f then
+				assert.message(('Kurwa nie dziala: %s'):format(msg)).falsy(true)
+			end
+
+			assert.are.equal(vim.trim(f:read('*a')), 'works')
+		end)
+	end)
+end
+
+return M

testfiles/README.md

@@ -3,3 +3,5 @@
 A special directory with all kinds of test files categorized by modules that use them in their tests.
 
 Tests use these files by requiring them like so: `require('testfiles.lib.modules')`, `require('testfiles.modules.foo')`, etc.
+
+Or simply opened by doing `io.open(testfile_dir .. 'lib/modules/foo.txt')`

testfiles/auto_test_runner/test.txt

@@ -0,0 +1 @@
+works