@Test
public void shouldHaveIdentifierThatIsUnique() {

    // Can't really test this, but we certainly can test that there are no duplicates in many contexts ...
    Set<String> ids = new HashSet<String>();
    for (int i = 0; i != 50; ++i) {
        assertThat(ids.add(new ExecutionContext().getId()), is(true));
    }
}