Is there a way to fake DateTime.now() in a Flutter test?

问题

I can pass in a time to my widget, but my widget is supposed to be instantiating the time in itself, not receiving a DateTime from a parent widget.

回答1:

extension CustomizableDateTime on DateTime {
  static DateTime customTime;
  static DateTime get current {
    if (customTime != null)
      return customTime;
    else
      return DateTime.now();
  }
}

Just use CustomizableDateTime.current in the production code. You can modify the returned value in tests like that: CustomizableDateTime.customTime = DateTime.parse("1969-07-20 20:18:04");. There is no need to use third party libraries.

回答2:

The clock package: https://pub.dartlang.org/documentation/clock/latest/clock/clock-library.html lets you inject a fake clock into the test.

来源：https://stackoverflow.com/questions/53674027/is-there-a-way-to-fake-datetime-now-in-a-flutter-test