Assumptions

Assumptions provide support for conditional test execution, if the assumptions are met the test is executed normally, if they don’t the test is aborted and marked as ignored.

Assumptions are typically used whenever it does not make sense to continue execution of a given test method — a typical usage is running tests depending on a given OS/environment.

All AssertJ assumptions are static methods in the Assumptions class, they match the assertion API but are names assumeThat instead of assertThat. You can also get assumptions through the WithAssumptions interface.

Example resulting in the test to be ignored:

@Test
public void when_an_assumption_is_not_met_the_test_is_ignored() {
  // since this assumption is obviously false ...
  assumeThat(frodo.getRace()).isEqualTo(ORC);
  // ... this assertion is not performed
  assertThat(fellowshipOfTheRing).contains(sauron);
}

Example resulting in the test to be executed normally:

@Test
public void when_all_assumptions_are_met_the_test_is_run_normally() {
  // since this assumption is true ...
  assumeThat(frodo.getRace()).isEqualTo(HOBBIT);
  // ... this assertion is performed
  assertThat(fellowshipOfTheRing).doesNotContain(sauron);
}