How to mock system date with joda time

Question

I am writing a UI test for a flow that makes use of the current date to do some processing. Here's how I get the current date in my fragment:

val today = dateFormat.format(Date())

In my test, I want to use a fixed date. To this end, I decided to use Joda time. Here's how I implemented it in my test:

@Test
fun testAFlow() {

    // setting date to fixed value
    DateTimeUtils.setCurrentMillisFixed(1610248674000)

    // launching activity
    activityRule.launchActivity(Intent())

    // remainder flow
    ...
}

The test runs fine without breaking but the actual date is still being used instead of the mocked date. How can I fix this?

score 1 · Accepted Answer · answered Feb 23 '21 at 14:01

1

You will get fixed date by calling of currentTimeMillis from DateTimeUtils

Log.d(BuildConfig.app_tag,"time " + DateTimeUtils.currentTimeMillis()); // output: current time millis

DateTimeUtils.setCurrentMillisFixed(1610248674000L);
    
Log.d(BuildConfig.app_tag,"time " + DateTimeUtils.currentTimeMillis()); // output: 1610248674000

the behavior of System.currentTimeMillis() will not be changed

answered Feb 23 '21 at 14:01

anatoli

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Alright, thanks. How do I go about changing/mocking System.currentTimeMillis() then? – Taslim Oseni Feb 23 '21 at 14:25
@TaslimOseni, [this](https://stackoverflow.com/questions/24491260/mocking-time-in-java-8s-java-time-api) could be helpful – anatoli Feb 24 '21 at 09:45

How to mock system date with joda time

1 Answers1