@Test
public void testToString_containsKey() throws Exception {

	// given
	Date date = new Date();
	Contributor contributor = new Contributor(123456789, 987654321, date);
	// when
	String str = contributor.toString();
	// then
	assertThat(str, stringContainsInOrder(asList("id", ":", "123456789")));
	assertThat(str, stringContainsInOrder(asList("organizationId", ":", "987654321")));
	assertThat(str, stringContainsInOrder(asList("snapshotDate", ":", "" + date)));
}