feat(testutil): add testutils

lua/gopher/_utils/testutil/init.lua

@@ -0,0 +1,35 @@
+local fixtures_dir = (vim.fn.expand "%:p:h") .. "/tests/fixtures/"
+
+---@class gopher.TestUtil
+local testutil = {}
+
+---@return string
+function testutil.tmp_file()
+  return vim.fn.tempname() .. ".go"
+end
+
+---@param path string
+---@return string
+function testutil.readfile(path)
+  return vim.fn.join(vim.fn.readfile(path), "\n")
+end
+
+---@param name string
+---@return {input: string, output: string}
+function testutil.read_fixture(name)
+  return {
+    input = testutil.readfile(fixtures_dir .. name .. "_input.go"),
+    output = testutil.readfile(fixtures_dir .. name .. "_output.go"),
+  }
+end
+
+function testutil.write_fixture(fpath, fixture)
+  vim.fn.writefile(vim.split(fixture, "\n"), fpath)
+end
+
+function testutil.cleanup(testfile)
+  vim.fn.delete(testfile)
+  vim.cmd.bd(testfile)
+end
+
+return testutil