blob: 1737cb702aed78b0da5a64dce45a697df2670dd8 [file] [log] [blame]
// Copyright 2015 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package render
import (
func init() {
// For testing purposes, pointers will render as "PTR" so that they are
// deterministic.
renderPointer = func(buf *bytes.Buffer, p uintptr) {
func assertRendersLike(t *testing.T, name string, v interface{}, exp string) {
act := Render(v)
if act != exp {
_, _, line, _ := runtime.Caller(1)
t.Errorf("On line #%d, [%s] did not match expectations:\nExpected: %s\nActual : %s\n", line, name, exp, act)
func TestRenderList(t *testing.T) {
// Note that we make some of the fields exportable. This is to avoid a fun case
// where the first reflect.Value has a read-only bit set, but follow-on values
// do not, so recursion tests are off by one.
type testStruct struct {
Name string
I interface{}
m string
type myStringSlice []string
type myStringMap map[string]string
type myIntType int
type myStringType string
s0 := "string0"
s0P := &s0
mit := myIntType(42)
stringer := fmt.Stringer(nil)
for i, tc := range []struct {
a interface{}
s string
{nil, `nil`},
{make(chan int), `(chan int)(PTR)`},
{&stringer, `(*fmt.Stringer)(nil)`},
{123, `123`},
{"hello", `"hello"`},
{(*testStruct)(nil), `(*render.testStruct)(nil)`},
{(**testStruct)(nil), `(**render.testStruct)(nil)`},
{[]***testStruct(nil), `[]***render.testStruct(nil)`},
{testStruct{Name: "foo", I: &testStruct{Name: "baz"}},
`render.testStruct{Name:"foo", I:(*render.testStruct){Name:"baz", I:interface{}(nil), m:""}, m:""}`},
{[]byte(nil), `[]uint8(nil)`},
{[]byte{}, `[]uint8{}`},
{map[string]string(nil), `map[string]string(nil)`},
{Name: "foo"},
{Name: "bar"},
}, `[]*render.testStruct{(*render.testStruct){Name:"foo", I:interface{}(nil), m:""}, ` +
`(*render.testStruct){Name:"bar", I:interface{}(nil), m:""}}`},
{myStringSlice{"foo", "bar"}, `render.myStringSlice{"foo", "bar"}`},
{myStringMap{"foo": "bar"}, `render.myStringMap{"foo":"bar"}`},
{myIntType(12), `render.myIntType(12)`},
{&mit, `(*render.myIntType)(42)`},
{myStringType("foo"), `render.myStringType("foo")`},
{struct {
a int
b string
}{123, "foo"}, `struct { a int; b string }{a:123, b:"foo"}`},
{[]string{"foo", "foo", "bar", "baz", "qux", "qux"},
`[]string{"foo", "foo", "bar", "baz", "qux", "qux"}`},
{[...]int{1, 2, 3}, `[3]int{1, 2, 3}`},
"foo": true,
"bar": false,
}, `map[string]bool{"bar":false, "foo":true}`},
{map[int]string{1: "foo", 2: "bar"}, `map[int]string{1:"foo", 2:"bar"}`},
{uint32(1337), `1337`},
{3.14, `3.14`},
{complex(3, 0.14), `(3+0.14i)`},
{&s0, `(*string)("string0")`},
{&s0P, `(**string)("string0")`},
{[]interface{}{nil, 1, 2, nil}, `[]interface{}{interface{}(nil), 1, 2, interface{}(nil)}`},
} {
assertRendersLike(t, fmt.Sprintf("Input #%d", i), tc.a, tc.s)
func TestRenderRecursiveStruct(t *testing.T) {
type testStruct struct {
Name string
I interface{}
s := &testStruct{
Name: "recursive",
s.I = s
assertRendersLike(t, "Recursive struct", s,
`(*render.testStruct){Name:"recursive", I:<REC(*render.testStruct)>}`)
func TestRenderRecursiveArray(t *testing.T) {
a := [2]interface{}{}
a[0] = &a
a[1] = &a
assertRendersLike(t, "Recursive array", &a,
`(*[2]interface{}){<REC(*[2]interface{})>, <REC(*[2]interface{})>}`)
func TestRenderRecursiveMap(t *testing.T) {
m := map[string]interface{}{}
foo := "foo"
m["foo"] = m
m["bar"] = [](*string){&foo, &foo}
v := []map[string]interface{}{m, m}
assertRendersLike(t, "Recursive map", v,
`"bar":[]*string{(*string)("foo"), (*string)("foo")}, `+
`"foo":<REC(map[string]interface{})>}, `+
`"bar":[]*string{(*string)("foo"), (*string)("foo")}, `+
func ExampleInReadme() {
type customType int
type testStruct struct {
S string
V *map[string]int
I interface{}
a := testStruct{
S: "hello",
V: &map[string]int{"foo": 0, "bar": 1},
I: customType(42),
fmt.Println("Render test:")
fmt.Printf("fmt.Printf: %s\n", sanitizePointer(fmt.Sprintf("%#v", a)))
fmt.Printf("render.Render: %s\n", Render(a))
// Output: Render test:
// fmt.Printf: render.testStruct{S:"hello", V:(*map[string]int)(0x600dd065), I:42}
// render.Render: render.testStruct{S:"hello", V:(*map[string]int){"bar":1, "foo":0}, I:render.customType(42)}
var pointerRE = regexp.MustCompile(`\(0x[a-f0-9]+\)`)
func sanitizePointer(s string) string {
return pointerRE.ReplaceAllString(s, "(0x600dd065)")