dart-lang/clock

Name: clock

Owner: Dart

Description: null

Created: 2018-03-06 04:05:56.0

Updated: 2018-05-02 20:01:55.0

Pushed: 2018-05-02 20:01:57.0

Homepage: https://pub.dartlang.org/packages/clock

Size: 55

Language: Dart

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README

This package provides a Clock class which encapsulates the notion of the “current time” and provides easy access to points relative to the current time. Different Clocks can have a different notion of the current time, and the default top-level clock's notion can be swapped out to reliably test timing-dependent code.

For example, you can use clock in your libraries like this:

un_with_timing.dart
rt 'package:clock/clock.dart';

Runs [callback] and prints how long it took.
nWithTiming<T>(T callback()) {
r stopwatch = clock.stopwatch()..start();
r result = callback();
int("It took ${stopwatch.elapsed}!");
turn result;

…and then test your code using the fake_async package, which automatically overrides the current clock:

un_with_timing_test.dart
rt 'run_with_timing.dart';

rt 'package:fake_async/fake_async.dart';
rt 'package:test/test.dart';

 main() {
st("runWithTiming() prints the elapsed time", () {
new FakeAsync().run((async) {
  expect(() {
    runWithTiming(() {
      async.elapse(new Duration(seconds: 10));
    });
  }, prints("It took 0:00:10.000000!"));
});
;