tempfile.c: add tests

test/unit/tempfile_spec.lua

@@ -0,0 +1,61 @@
+local lfs = require 'lfs'
+local helpers = require 'test.unit.helpers'
+
+local os = helpers.cimport './src/nvim/os/os.h'
+local tempfile = helpers.cimport './src/nvim/tempfile.h'
+
+describe('tempfile related functions', function()
+  after_each(function()
+    -- This won't work because vim_deltempdir() uses global buffer
+    -- that is initialized in main() and main() is not called for unit tests.
+    -- But it is not a big problem: all tests can work with or without it.
+    -- tempfile.vim_deltempdir()
+  end)
+
+  local vim_gettempdir = function()
+    return helpers.ffi.string(tempfile.vim_gettempdir())
+  end
+
+  describe('vim_gettempdir', function()
+    it('returns path to Neovim own temp directory', function()
+      local dir = vim_gettempdir()
+      assert.True(dir ~= nil and dir:len() > 0)
+      -- os_file_is_writable returns 2 for a directory which we have rights
+      -- to write into.
+      assert.equals(os.os_file_is_writable(helpers.to_cstr(dir)), 2)
+      for entry in lfs.dir(dir) do
+        assert.True(entry == '.' or entry == '..')
+      end
+    end)
+
+    it('returns the same directory on each call', function()
+      local dir1 = vim_gettempdir()
+      local dir2 = vim_gettempdir()
+      assert.equals(dir1, dir2)
+    end)
+  end)
+
+  describe('vim_tempname', function()
+    local vim_tempname = function()
+      return helpers.ffi.string(tempfile.vim_tempname())
+    end
+
+    it('generate name of non-existing file', function()
+      local file = vim_tempname()
+      assert.truthy(file)
+      assert.False(os.os_file_exists(file))
+    end)
+
+    it('generate different names on each call', function()
+      local fst = vim_tempname()
+      local snd = vim_tempname()
+      assert.not_equals(fst, snd)
+    end)
+
+    it('generate file name in Neovim own temp directory', function()
+      local dir = vim_gettempdir()
+      local file = vim_tempname()
+      assert.truthy(file:find('^' .. dir .. '[^/]*$'))
+    end)
+  end)
+end)