// Copyright 2023 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package templates import (	"errors"	"html/template"	"os"	"strings"	"testing" 	"forgejo.org/modules/assetfs" 	"github.com/stretchr/testify/assert"	"github.com/stretchr/testify/require") func TestExtractErrorLine(t *testing.T) {	cases := []struct {		code   string		line   int		pos    int		target string		expect string	}{		{"hello world\nfoo bar foo bar\ntest", 2, -1, "bar", `foo bar foo bar    ^^^     ^^^`}, 		{"hello world\nfoo bar foo bar\ntest", 2, 4, "bar", `foo bar foo bar    ^`}, 		{			"hello world\nfoo bar foo bar\ntest", 2, 4, "",			`foo bar foo bar    ^`,		}, 		{			"hello world\nfoo bar foo bar\ntest", 5, 0, "",			`unable to find target line 5`,		},	} 	for _, c := range cases {		actual := extractErrorLine([]byte(c.code), c.line, c.pos, c.target)		assert.Equal(t, strings.TrimSpace(c.expect), strings.TrimSpace(actual))	}} func TestHandleError(t *testing.T) {	dir := t.TempDir() 	p := &templateErrorPrettier{assets: assetfs.Layered(assetfs.Local("tmp", dir))} 	test := func(s string, h func(error) string, expect string) {		err := os.WriteFile(dir+"/test.tmpl", []byte(s), 0o644)		require.NoError(t, err)		tmpl := template.New("test")		_, err = tmpl.Parse(s)		require.Error(t, err)		msg := h(err)		assert.Equal(t, strings.TrimSpace(expect), strings.TrimSpace(msg))	} 	test("{{", p.handleGenericTemplateError, `template error: tmp:test:1 : unclosed action----------------------------------------------------------------------{{----------------------------------------------------------------------`) 	test("{{Func}}", p.handleFuncNotDefinedError, `template error: tmp:test:1 : function "Func" not defined----------------------------------------------------------------------{{Func}}  ^^^^----------------------------------------------------------------------`) 	test("{{'x'3}}", p.handleUnexpectedOperandError, `template error: tmp:test:1 : unexpected "3" in operand----------------------------------------------------------------------{{'x'3}}     ^----------------------------------------------------------------------`) 	// no idea about how to trigger such strange error, so mock an error to test it	err := os.WriteFile(dir+"/test.tmpl", []byte("god knows XXX"), 0o644)	require.NoError(t, err)	expectedMsg := `template error: tmp:test:1 : expected end; found XXX----------------------------------------------------------------------god knows XXX          ^^^----------------------------------------------------------------------`	actualMsg := p.handleExpectedEndError(errors.New("template: test:1: expected end; found XXX"))	assert.Equal(t, strings.TrimSpace(expectedMsg), strings.TrimSpace(actualMsg))}