code review 4808089: exp/template/html: New package with a toy template tran...

src/pkg/exp/template/html/reverse_test.go

+// Copyright 2011 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 html
+
+import (
+        "bytes"
+        "exp/template"
+        "testing"
+)
+
+type data struct {
+        World  string
+        Coming bool
+}
+
+func TestReverse(t *testing.T) {
+        templateSource :=
+                "{{if .Coming}}Hello{{else}}Goodbye{{end}}, {{.World}}!"
+        templateData := data{
+                World:  "Cincinatti",
+                Coming: true,
+        }
+
+        tmpl := template.New("test")
+        tmpl, err := tmpl.Parse(templateSource)
+        if err != nil {
+                t.Errorf("failed to parse template: %s", err)
+                return
+        }
+
+        Reverse(tmpl)
+
+        buffer := new(bytes.Buffer)
+
+        err = tmpl.Execute(buffer, templateData)
+        if err != nil {
+                t.Errorf("failed to execute reversed template: %s", err)
+                return
+        }
+
+        golden := "!ittanicniC ,olleH"
+        actual := buffer.String()
+        if golden != actual {
+                t.Errorf("reversed output: %q != %q", golden, actual)
+        }
+}