How to mock current date?

Question

I have a method in my code which verifies that current day is business. it checks database calendar for this.

method looks like this:

public boolean iBusinessDayToday() {
      LocalDate today = LocalDate.now();
      //logic with today
}

I need to write unit tests for this.

I want that unit test doesn't depends in week day.

What do you think need this issue to use powerMockito to mock LocalDate.now() ?

As the Javadoc of `LocalDate.now()` warns: `Using this method will prevent the ability to use an alternate clock for testing because the clock is hard-coded.` — biziclop, Mar 03 '16 at 14:21

score 6 · Accepted Answer · answered Mar 03 '16 at 14:16

6

An alternative would be to pass the clock to the method:

public boolean iBusinessDayToday() {
  return iBusinessDayToday(Clock.systemDefaultZone());
}

@VisibleForTesting
boolean iBusinessDayToday(Clock clock) {
      LocalDate today = LocalDate.now(clock);
      //logic with today
}

Now you can test the second method and pass a a fixed clock - no need to use a mocking framework.

answered Mar 03 '16 at 14:16

assylias

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2

It might be better to make the `Clock` a member of the class, passed to its constructor. Or to change the method to `isBusinessDay(LocalDate day)`. The question is what class is responsible for defining "today"? That's the class which should own the `Clock`. – aro_tech Mar 04 '16 at 05:00

How to mock current date?

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