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// Copyright 2018 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.
//go:build js && wasm
// +build js,wasm
// To run these tests:
//
// - Install Node
// - Add /path/to/go/misc/wasm to your $PATH (so that "go test" can find
// "go_js_wasm_exec").
// - GOOS=js GOARCH=wasm go test
//
// See -exec in "go help test", and "go help run" for details.
package js_test
import (
"fmt"
"math"
"runtime"
"syscall/js"
"testing"
)
var dummys = js.Global().Call("eval", `({
someBool: true,
someString: "abc\u1234",
someInt: 42,
someFloat: 42.123,
someArray: [41, 42, 43],
someDate: new Date(),
add: function(a, b) {
return a + b;
},
zero: 0,
stringZero: "0",
NaN: NaN,
emptyObj: {},
emptyArray: [],
Infinity: Infinity,
NegInfinity: -Infinity,
objNumber0: new Number(0),
objBooleanFalse: new Boolean(false),
})`)
func TestBool(t *testing.T) {
want := true
o := dummys.Get("someBool")
if got := o.Bool(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
dummys.Set("otherBool", want)
if got := dummys.Get("otherBool").Bool(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if !dummys.Get("someBool").Equal(dummys.Get("someBool")) {
t.Errorf("same value not equal")
}
}
func TestString(t *testing.T) {
want := "abc\u1234"
o := dummys.Get("someString")
if got := o.String(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
dummys.Set("otherString", want)
if got := dummys.Get("otherString").String(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if !dummys.Get("someString").Equal(dummys.Get("someString")) {
t.Errorf("same value not equal")
}
if got, want := js.Undefined().String(), "<undefined>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.Null().String(), "<null>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.ValueOf(true).String(), "<boolean: true>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.ValueOf(42.5).String(), "<number: 42.5>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.Global().Call("Symbol").String(), "<symbol>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.Global().String(), "<object>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := js.Global().Get("setTimeout").String(), "<function>"; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
}
func TestInt(t *testing.T) {
want := 42
o := dummys.Get("someInt")
if got := o.Int(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
dummys.Set("otherInt", want)
if got := dummys.Get("otherInt").Int(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if !dummys.Get("someInt").Equal(dummys.Get("someInt")) {
t.Errorf("same value not equal")
}
if got := dummys.Get("zero").Int(); got != 0 {
t.Errorf("got %#v, want %#v", got, 0)
}
}
func TestIntConversion(t *testing.T) {
testIntConversion(t, 0)
testIntConversion(t, 1)
testIntConversion(t, -1)
testIntConversion(t, 1<<20)
testIntConversion(t, -1<<20)
testIntConversion(t, 1<<40)
testIntConversion(t, -1<<40)
testIntConversion(t, 1<<60)
testIntConversion(t, -1<<60)
}
func testIntConversion(t *testing.T, want int) {
if got := js.ValueOf(want).Int(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
}
func TestFloat(t *testing.T) {
want := 42.123
o := dummys.Get("someFloat")
if got := o.Float(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
dummys.Set("otherFloat", want)
if got := dummys.Get("otherFloat").Float(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if !dummys.Get("someFloat").Equal(dummys.Get("someFloat")) {
t.Errorf("same value not equal")
}
}
func TestObject(t *testing.T) {
if !dummys.Get("someArray").Equal(dummys.Get("someArray")) {
t.Errorf("same value not equal")
}
// An object and its prototype should not be equal.
proto := js.Global().Get("Object").Get("prototype")
o := js.Global().Call("eval", "new Object()")
if proto.Equal(o) {
t.Errorf("object equals to its prototype")
}
}
func TestFrozenObject(t *testing.T) {
o := js.Global().Call("eval", "(function () { let o = new Object(); o.field = 5; Object.freeze(o); return o; })()")
want := 5
if got := o.Get("field").Int(); want != got {
t.Errorf("got %#v, want %#v", got, want)
}
}
func TestEqual(t *testing.T) {
if !dummys.Get("someFloat").Equal(dummys.Get("someFloat")) {
t.Errorf("same float is not equal")
}
if !dummys.Get("emptyObj").Equal(dummys.Get("emptyObj")) {
t.Errorf("same object is not equal")
}
if dummys.Get("someFloat").Equal(dummys.Get("someInt")) {
t.Errorf("different values are not unequal")
}
}
func TestNaN(t *testing.T) {
if !dummys.Get("NaN").IsNaN() {
t.Errorf("JS NaN is not NaN")
}
if !js.ValueOf(math.NaN()).IsNaN() {
t.Errorf("Go NaN is not NaN")
}
if dummys.Get("NaN").Equal(dummys.Get("NaN")) {
t.Errorf("NaN is equal to NaN")
}
}
func TestUndefined(t *testing.T) {
if !js.Undefined().IsUndefined() {
t.Errorf("undefined is not undefined")
}
if !js.Undefined().Equal(js.Undefined()) {
t.Errorf("undefined is not equal to undefined")
}
if dummys.IsUndefined() {
t.Errorf("object is undefined")
}
if js.Undefined().IsNull() {
t.Errorf("undefined is null")
}
if dummys.Set("test", js.Undefined()); !dummys.Get("test").IsUndefined() {
t.Errorf("could not set undefined")
}
}
func TestNull(t *testing.T) {
if !js.Null().IsNull() {
t.Errorf("null is not null")
}
if !js.Null().Equal(js.Null()) {
t.Errorf("null is not equal to null")
}
if dummys.IsNull() {
t.Errorf("object is null")
}
if js.Null().IsUndefined() {
t.Errorf("null is undefined")
}
if dummys.Set("test", js.Null()); !dummys.Get("test").IsNull() {
t.Errorf("could not set null")
}
if dummys.Set("test", nil); !dummys.Get("test").IsNull() {
t.Errorf("could not set nil")
}
}
func TestLength(t *testing.T) {
if got := dummys.Get("someArray").Length(); got != 3 {
t.Errorf("got %#v, want %#v", got, 3)
}
}
func TestGet(t *testing.T) {
// positive cases get tested per type
expectValueError(t, func() {
dummys.Get("zero").Get("badField")
})
}
func TestSet(t *testing.T) {
// positive cases get tested per type
expectValueError(t, func() {
dummys.Get("zero").Set("badField", 42)
})
}
func TestDelete(t *testing.T) {
dummys.Set("test", 42)
dummys.Delete("test")
if dummys.Call("hasOwnProperty", "test").Bool() {
t.Errorf("property still exists")
}
expectValueError(t, func() {
dummys.Get("zero").Delete("badField")
})
}
func TestIndex(t *testing.T) {
if got := dummys.Get("someArray").Index(1).Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
expectValueError(t, func() {
dummys.Get("zero").Index(1)
})
}
func TestSetIndex(t *testing.T) {
dummys.Get("someArray").SetIndex(2, 99)
if got := dummys.Get("someArray").Index(2).Int(); got != 99 {
t.Errorf("got %#v, want %#v", got, 99)
}
expectValueError(t, func() {
dummys.Get("zero").SetIndex(2, 99)
})
}
func TestCall(t *testing.T) {
var i int64 = 40
if got := dummys.Call("add", i, 2).Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
if got := dummys.Call("add", js.Global().Call("eval", "40"), 2).Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
expectPanic(t, func() {
dummys.Call("zero")
})
expectValueError(t, func() {
dummys.Get("zero").Call("badMethod")
})
}
func TestInvoke(t *testing.T) {
var i int64 = 40
if got := dummys.Get("add").Invoke(i, 2).Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
expectValueError(t, func() {
dummys.Get("zero").Invoke()
})
}
func TestNew(t *testing.T) {
if got := js.Global().Get("Array").New(42).Length(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
expectValueError(t, func() {
dummys.Get("zero").New()
})
}
func TestInstanceOf(t *testing.T) {
someArray := js.Global().Get("Array").New()
if got, want := someArray.InstanceOf(js.Global().Get("Array")), true; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got, want := someArray.InstanceOf(js.Global().Get("Function")), false; got != want {
t.Errorf("got %#v, want %#v", got, want)
}
}
func TestType(t *testing.T) {
if got, want := js.Undefined().Type(), js.TypeUndefined; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.Null().Type(), js.TypeNull; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.ValueOf(true).Type(), js.TypeBoolean; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.ValueOf(0).Type(), js.TypeNumber; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.ValueOf(42).Type(), js.TypeNumber; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.ValueOf("test").Type(), js.TypeString; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.Global().Get("Symbol").Invoke("test").Type(), js.TypeSymbol; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.Global().Get("Array").New().Type(), js.TypeObject; got != want {
t.Errorf("got %s, want %s", got, want)
}
if got, want := js.Global().Get("Array").Type(), js.TypeFunction; got != want {
t.Errorf("got %s, want %s", got, want)
}
}
type object = map[string]interface{}
type array = []interface{}
func TestValueOf(t *testing.T) {
a := js.ValueOf(array{0, array{0, 42, 0}, 0})
if got := a.Index(1).Index(1).Int(); got != 42 {
t.Errorf("got %v, want %v", got, 42)
}
o := js.ValueOf(object{"x": object{"y": 42}})
if got := o.Get("x").Get("y").Int(); got != 42 {
t.Errorf("got %v, want %v", got, 42)
}
}
func TestZeroValue(t *testing.T) {
var v js.Value
if !v.IsUndefined() {
t.Error("zero js.Value is not js.Undefined()")
}
}
func TestFuncOf(t *testing.T) {
c := make(chan struct{})
cb := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
if got := args[0].Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
c <- struct{}{}
return nil
})
defer cb.Release()
js.Global().Call("setTimeout", cb, 0, 42)
<-c
}
func TestInvokeFunction(t *testing.T) {
called := false
cb := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
cb2 := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
called = true
return 42
})
defer cb2.Release()
return cb2.Invoke()
})
defer cb.Release()
if got := cb.Invoke().Int(); got != 42 {
t.Errorf("got %#v, want %#v", got, 42)
}
if !called {
t.Error("function not called")
}
}
func TestInterleavedFunctions(t *testing.T) {
c1 := make(chan struct{})
c2 := make(chan struct{})
js.Global().Get("setTimeout").Invoke(js.FuncOf(func(this js.Value, args []js.Value) interface{} {
c1 <- struct{}{}
<-c2
return nil
}), 0)
<-c1
c2 <- struct{}{}
// this goroutine is running, but the callback of setTimeout did not return yet, invoke another function now
f := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
return nil
})
f.Invoke()
}
func ExampleFuncOf() {
var cb js.Func
cb = js.FuncOf(func(this js.Value, args []js.Value) interface{} {
fmt.Println("button clicked")
cb.Release() // release the function if the button will not be clicked again
return nil
})
js.Global().Get("document").Call("getElementById", "myButton").Call("addEventListener", "click", cb)
}
// See
// - https://developer.mozilla.org/en-US/docs/Glossary/Truthy
// - https://stackoverflow.com/questions/19839952/all-falsey-values-in-javascript/19839953#19839953
// - http://www.ecma-international.org/ecma-262/5.1/#sec-9.2
func TestTruthy(t *testing.T) {
want := true
for _, key := range []string{
"someBool", "someString", "someInt", "someFloat", "someArray", "someDate",
"stringZero", // "0" is truthy
"add", // functions are truthy
"emptyObj", "emptyArray", "Infinity", "NegInfinity",
// All objects are truthy, even if they're Number(0) or Boolean(false).
"objNumber0", "objBooleanFalse",
} {
if got := dummys.Get(key).Truthy(); got != want {
t.Errorf("%s: got %#v, want %#v", key, got, want)
}
}
want = false
if got := dummys.Get("zero").Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got := dummys.Get("NaN").Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got := js.ValueOf("").Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got := js.Null().Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
if got := js.Undefined().Truthy(); got != want {
t.Errorf("got %#v, want %#v", got, want)
}
}
func expectValueError(t *testing.T, fn func()) {
defer func() {
err := recover()
if _, ok := err.(*js.ValueError); !ok {
t.Errorf("expected *js.ValueError, got %T", err)
}
}()
fn()
}
func expectPanic(t *testing.T, fn func()) {
defer func() {
err := recover()
if err == nil {
t.Errorf("expected panic")
}
}()
fn()
}
var copyTests = []struct {
srcLen int
dstLen int
copyLen int
}{
{5, 3, 3},
{3, 5, 3},
{0, 0, 0},
}
func TestCopyBytesToGo(t *testing.T) {
for _, tt := range copyTests {
t.Run(fmt.Sprintf("%d-to-%d", tt.srcLen, tt.dstLen), func(t *testing.T) {
src := js.Global().Get("Uint8Array").New(tt.srcLen)
if tt.srcLen >= 2 {
src.SetIndex(1, 42)
}
dst := make([]byte, tt.dstLen)
if got, want := js.CopyBytesToGo(dst, src), tt.copyLen; got != want {
t.Errorf("copied %d, want %d", got, want)
}
if tt.dstLen >= 2 {
if got, want := int(dst[1]), 42; got != want {
t.Errorf("got %d, want %d", got, want)
}
}
})
}
}
func TestCopyBytesToJS(t *testing.T) {
for _, tt := range copyTests {
t.Run(fmt.Sprintf("%d-to-%d", tt.srcLen, tt.dstLen), func(t *testing.T) {
src := make([]byte, tt.srcLen)
if tt.srcLen >= 2 {
src[1] = 42
}
dst := js.Global().Get("Uint8Array").New(tt.dstLen)
if got, want := js.CopyBytesToJS(dst, src), tt.copyLen; got != want {
t.Errorf("copied %d, want %d", got, want)
}
if tt.dstLen >= 2 {
if got, want := dst.Index(1).Int(), 42; got != want {
t.Errorf("got %d, want %d", got, want)
}
}
})
}
}
func TestGarbageCollection(t *testing.T) {
before := js.JSGo.Get("_values").Length()
for i := 0; i < 1000; i++ {
_ = js.Global().Get("Object").New().Call("toString").String()
runtime.GC()
}
after := js.JSGo.Get("_values").Length()
if after-before > 500 {
t.Errorf("garbage collection ineffective")
}
}
// BenchmarkDOM is a simple benchmark which emulates a webapp making DOM operations.
// It creates a div, and sets its id. Then searches by that id and sets some data.
// Finally it removes that div.
func BenchmarkDOM(b *testing.B) {
document := js.Global().Get("document")
if document.IsUndefined() {
b.Skip("Not a browser environment. Skipping.")
}
const data = "someString"
for i := 0; i < b.N; i++ {
div := document.Call("createElement", "div")
div.Call("setAttribute", "id", "myDiv")
document.Get("body").Call("appendChild", div)
myDiv := document.Call("getElementById", "myDiv")
myDiv.Set("innerHTML", data)
if got, want := myDiv.Get("innerHTML").String(), data; got != want {
b.Errorf("got %s, want %s", got, want)
}
document.Get("body").Call("removeChild", div)
}
}
func TestGlobal(t *testing.T) {
ident := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
return args[0]
})
defer ident.Release()
if got := ident.Invoke(js.Global()); !got.Equal(js.Global()) {
t.Errorf("got %#v, want %#v", got, js.Global())
}
}