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testutil.go
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testutil.go
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package testutil
import (
"context"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/jalavosus/gopromise"
)
const ctxTimeout = 2 * time.Second
type TestCase struct {
name string
wantErr bool
fnWait time.Duration
}
var testCases = []TestCase{
{
name: "timeout-occurs=false",
fnWait: 1500 * time.Millisecond,
wantErr: false,
},
{
name: "timeout-occurs=true",
fnWait: 2050 * time.Millisecond,
wantErr: true,
},
}
type (
PromiseMaker func(*testing.T, promise.Func[uint]) promise.Promise[uint]
PromiseTestRunner func(*testing.T, promise.Func[uint], promise.Promise[uint])
PromiseResolver func(*testing.T, promise.Promise[uint]) promise.Result[uint]
)
func newContext(ctx context.Context) (context.Context, context.CancelFunc) {
return context.WithTimeout(ctx, ctxTimeout)
}
func makePromiseResolver(ctx context.Context, fnWait time.Duration) promise.Func[uint] {
const res uint = 42
return func(resolve promise.ResolveFunc[uint], reject promise.RejectFunc) {
ticker := time.NewTicker(fnWait)
defer func() {
ticker.Stop()
}()
for {
select {
case <-ctx.Done():
if err := ctx.Err(); err != nil {
reject(err)
} else {
resolve(res)
}
return
case <-ticker.C:
resolve(res)
return
}
}
}
}
func TestResolve(
t *testing.T,
newProm PromiseMaker,
runProm PromiseTestRunner,
resolveAsync bool,
) {
testCtx := context.Background()
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
ctx, cancel := newContext(testCtx)
defer cancel()
var res promise.Result[uint]
promFn := makePromiseResolver(ctx, tc.fnWait)
prom := newProm(t, promFn)
runProm(t, promFn, prom)
if resolveAsync {
ResolveAsyncLoop:
for {
select {
case val := <-prom.ResolveAsync():
res = val
break ResolveAsyncLoop
}
}
} else {
res = prom.Resolve()
}
assertPromiseResolveTests(t, tc, prom, res)
})
}
}
func assertPromiseResolveTests(t *testing.T, tc TestCase, prom promise.Promise[uint], res promise.Result[uint]) {
t.Helper()
if tc.wantErr {
assert.True(t, prom.Rejected())
assert.False(t, prom.Fulfilled())
assert.Nil(t, res.Result())
assert.Error(t, res.Err())
} else {
assert.True(t, prom.Fulfilled())
assert.False(t, prom.Rejected())
assert.NotNil(t, res.Result())
assert.NoError(t, res.Err())
}
}