@Test
public void testCalculateExperimentEstimatedDaysDurationWithInvalidResult() {

	Mockito.when(
		_jsonWebServiceClient.doPost(
			Mockito.eq(String.class), Mockito.anyString(),
			Mockito.anyString(), Mockito.any(ExperimentSettings.class),
			Mockito.anyMapOf(String.class, String.class))
	).thenReturn(
		RandomTestUtil.randomString()
	);
	Assert.assertNull(
		_asahFaroBackendClient.calculateExperimentEstimatedDaysDuration(
			RandomTestUtil.randomLong(), RandomTestUtil.randomString(),
			new ExperimentSettings()));
}