iframe-proxy | Sunbelt Computer Software

56 lines (50 loc) · 1.44 KB

package testutil
	"github.com/stretchr/testify/assert"
// Eventually is like require.Eventually except it allows passing
// a context into the condition. It is safe to use with `require.*`.
// If ctx times out, the test will fail, but not immediately.
// It is the caller's responsibility to exit early if required.
// It is the caller's responsibility to ensure that ctx has a
// deadline or timeout set. Eventually will panic if this is not
// the case in order to avoid potentially waiting forever.
// condition is not run in a goroutine; use the provided
// context argument for cancellation if required.
func Eventually(ctx context.Context, t testing.TB, condition func(ctx context.Context) (done bool), tick time.Duration, msgAndArgs ...interface{}) (done bool) {
	t.Helper()
	if _, ok := ctx.Deadline(); !ok {
		panic("developer error: must set deadline or timeout on ctx")
	msg := "Eventually timed out"
	if len(msgAndArgs) > 0 {
		m, ok := msgAndArgs[0].(string)
			panic("developer error: first argument of msgAndArgs must be a string")
		msg = fmt.Sprintf(m, msgAndArgs[1:]...)
	ticker := time.NewTicker(tick)
	defer ticker.Stop()
	for tick := ticker.C; ; {
		case <-ctx.Done():
			assert.NoError(t, ctx.Err(), msg)
			return false
		case <-tick:
			if !assert.NoError(t, ctx.Err(), msg) {
				return false
			if condition(ctx) {
				return true

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eventually.go

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