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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package template_test
import (
"bytes"
. "html/template"
"strings"
"testing"
)
func TestTemplateClone(t *testing.T) {
// https://golang.org/issue/12996
orig := New("name")
clone, err := orig.Clone()
if err != nil {
t.Fatal(err)
}
if len(clone.Templates()) != len(orig.Templates()) {
t.Fatalf("Invalid length of t.Clone().Templates()")
}
const want = "stuff"
parsed := Must(clone.Parse(want))
var buf bytes.Buffer
err = parsed.Execute(&buf, nil)
if err != nil {
t.Fatal(err)
}
if got := buf.String(); got != want {
t.Fatalf("got %q; want %q", got, want)
}
}
func TestRedefineNonEmptyAfterExecution(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, `foo`)
c.mustExecute(c.root, nil, "foo")
c.mustNotParse(c.root, `bar`)
}
func TestRedefineEmptyAfterExecution(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, ``)
c.mustExecute(c.root, nil, "")
c.mustNotParse(c.root, `foo`)
c.mustExecute(c.root, nil, "")
}
func TestRedefineAfterNonExecution(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, `{{if .}}<{{template "X"}}>{{end}}{{define "X"}}foo{{end}}`)
c.mustExecute(c.root, 0, "")
c.mustNotParse(c.root, `{{define "X"}}bar{{end}}`)
c.mustExecute(c.root, 1, "<foo>")
}
func TestRedefineAfterNamedExecution(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, `<{{template "X" .}}>{{define "X"}}foo{{end}}`)
c.mustExecute(c.root, nil, "<foo>")
c.mustNotParse(c.root, `{{define "X"}}bar{{end}}`)
c.mustExecute(c.root, nil, "<foo>")
}
func TestRedefineNestedByNameAfterExecution(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, `{{define "X"}}foo{{end}}`)
c.mustExecute(c.lookup("X"), nil, "foo")
c.mustNotParse(c.root, `{{define "X"}}bar{{end}}`)
c.mustExecute(c.lookup("X"), nil, "foo")
}
func TestRedefineNestedByTemplateAfterExecution(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, `{{define "X"}}foo{{end}}`)
c.mustExecute(c.lookup("X"), nil, "foo")
c.mustNotParse(c.lookup("X"), `bar`)
c.mustExecute(c.lookup("X"), nil, "foo")
}
func TestRedefineSafety(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, `<html><a href="{{template "X"}}">{{define "X"}}{{end}}`)
c.mustExecute(c.root, nil, `<html><a href="">`)
// Note: Every version of Go prior to Go 1.8 accepted the redefinition of "X"
// on the next line, but luckily kept it from being used in the outer template.
// Now we reject it, which makes clearer that we're not going to use it.
c.mustNotParse(c.root, `{{define "X"}}" bar="baz{{end}}`)
c.mustExecute(c.root, nil, `<html><a href="">`)
}
func TestRedefineTopUse(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, `{{template "X"}}{{.}}{{define "X"}}{{end}}`)
c.mustExecute(c.root, 42, `42`)
c.mustNotParse(c.root, `{{define "X"}}<script>{{end}}`)
c.mustExecute(c.root, 42, `42`)
}
func TestRedefineOtherParsers(t *testing.T) {
c := newTestCase(t)
c.mustParse(c.root, ``)
c.mustExecute(c.root, nil, ``)
if _, err := c.root.ParseFiles("no.template"); err == nil || !strings.Contains(err.Error(), "Execute") {
t.Errorf("ParseFiles: %v\nwanted error about already having Executed", err)
}
if _, err := c.root.ParseGlob("*.no.template"); err == nil || !strings.Contains(err.Error(), "Execute") {
t.Errorf("ParseGlob: %v\nwanted error about already having Executed", err)
}
if _, err := c.root.AddParseTree("t1", c.root.Tree); err == nil || !strings.Contains(err.Error(), "Execute") {
t.Errorf("AddParseTree: %v\nwanted error about already having Executed", err)
}
}
type testCase struct {
t *testing.T
root *Template
}
func newTestCase(t *testing.T) *testCase {
return &testCase{
t: t,
root: New("root"),
}
}
func (c *testCase) lookup(name string) *Template {
return c.root.Lookup(name)
}
func (c *testCase) mustParse(t *Template, text string) {
_, err := t.Parse(text)
if err != nil {
c.t.Fatalf("parse: %v", err)
}
}
func (c *testCase) mustNotParse(t *Template, text string) {
_, err := t.Parse(text)
if err == nil {
c.t.Fatalf("parse: unexpected success")
}
}
func (c *testCase) mustExecute(t *Template, val interface{}, want string) {
var buf bytes.Buffer
err := t.Execute(&buf, val)
if err != nil {
c.t.Fatalf("execute: %v", err)
}
if buf.String() != want {
c.t.Fatalf("template output:\n%s\nwant:\n%s", buf.String(), want)
}
}