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promise_test.go
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promise_test.go
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// Copyright 2021 Roger Chapman and the v8go contributors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package v8go_test
import (
"errors"
"testing"
v8 "github.com/tommie/v8go"
)
func TestPromiseFulfilled(t *testing.T) {
t.Parallel()
iso := v8.NewIsolate()
defer iso.Dispose()
ctx := v8.NewContext(iso)
defer ctx.Close()
if _, err := v8.NewPromiseResolver(nil); err == nil {
t.Error("expected error with <nil> Context")
}
res1, _ := v8.NewPromiseResolver(ctx)
prom1 := res1.GetPromise()
if s := prom1.State(); s != v8.Pending {
t.Errorf("unexpected state for Promise, want Pending (0) got: %v", s)
}
var thenInfo *v8.FunctionCallbackInfo
prom1thenVal := prom1.Then(func(info *v8.FunctionCallbackInfo) *v8.Value {
thenInfo = info
return nil
})
prom1then, _ := prom1thenVal.AsPromise()
if prom1then.State() != v8.Pending {
t.Errorf("unexpected state for dependent Promise, want Pending got: %v", prom1then.State())
}
if thenInfo != nil {
t.Error("unexpected call of Then prior to resolving the promise")
}
val1, _ := v8.NewValue(iso, "foo")
res1.Resolve(val1)
if s := prom1.State(); s != v8.Fulfilled {
t.Fatalf("unexpected state for Promise, want Fulfilled (1) got: %v", s)
}
if result := prom1.Result(); result.String() != val1.String() {
t.Errorf("expected the Promise result to match the resolve value, but got: %s", result)
}
if thenInfo == nil {
t.Errorf("expected Then to be called, was not")
}
if len(thenInfo.Args()) != 1 || thenInfo.Args()[0].String() != "foo" {
t.Errorf("expected promise to be called with [foo] args, was: %+v", thenInfo.Args())
}
}
func TestPromiseRejected(t *testing.T) {
t.Parallel()
iso := v8.NewIsolate()
defer iso.Dispose()
ctx := v8.NewContext(iso)
defer ctx.Close()
res2, _ := v8.NewPromiseResolver(ctx)
val2, _ := v8.NewValue(iso, "Bad Foo")
res2.Reject(val2)
prom2 := res2.GetPromise()
if s := prom2.State(); s != v8.Rejected {
t.Fatalf("unexpected state for Promise, want Rejected (2) got: %v", s)
}
var thenInfo *v8.FunctionCallbackInfo
var then2Fulfilled, then2Rejected bool
prom2.
Catch(func(info *v8.FunctionCallbackInfo) *v8.Value {
thenInfo = info
return nil
}).
Then(
func(_ *v8.FunctionCallbackInfo) *v8.Value {
then2Fulfilled = true
return nil
},
func(_ *v8.FunctionCallbackInfo) *v8.Value {
then2Rejected = true
return nil
},
)
ctx.PerformMicrotaskCheckpoint()
if thenInfo == nil {
t.Fatalf("expected Then to be called on already-resolved promise, but was not")
}
if len(thenInfo.Args()) != 1 || thenInfo.Args()[0].String() != val2.String() {
t.Fatalf("expected [%v], was: %+v", val2, thenInfo.Args())
}
if !then2Fulfilled {
t.Fatalf("expected call to onFulfilled, got none")
}
if then2Rejected {
t.Fatalf("unexpectedly called onRejected")
}
}
func TestPromiseThenCanThrow(t *testing.T) {
t.Parallel()
iso := v8.NewIsolate()
defer iso.Dispose()
ctx := v8.NewContext(iso)
defer ctx.Close()
res, _ := v8.NewPromiseResolver(ctx)
promThenVal := res.GetPromise().ThenWithError(func(info *v8.FunctionCallbackInfo) (*v8.Value, error) {
return nil, errors.New("faked error")
})
promThen, err := promThenVal.AsPromise()
if err != nil {
t.Fatalf("AsPromise failed: %v", err)
}
val, _ := v8.NewValue(iso, "foo")
res.Resolve(val)
if s := promThen.State(); s != v8.Rejected {
t.Fatalf("unexpected state for Promise, want Rejected (%v) got: %v", v8.Rejected, s)
}
if result := promThen.Result(); result.String() != "faked error" {
t.Errorf("expected the Promise result to match the resolve value, but got: %s", result)
}
}
func TestPromiseThenPanic(t *testing.T) {
t.Parallel()
iso := v8.NewIsolate()
defer iso.Dispose()
ctx := v8.NewContext(iso)
defer ctx.Close()
res, _ := v8.NewPromiseResolver(ctx)
prom := res.GetPromise()
t.Run("no callbacks", func(t *testing.T) {
defer func() { recover() }()
prom.Then()
t.Errorf("expected a panic")
})
t.Run("3 callbacks", func(t *testing.T) {
defer func() { recover() }()
fn := func(_ *v8.FunctionCallbackInfo) *v8.Value { return nil }
prom.Then(fn, fn, fn)
t.Errorf("expected a panic")
})
}