Check stepMismatch results for type=week. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Empty values PASS stepMismatchFor("", null, null) is false PASS stepMismatchFor("", "2", "1970-W02") is false Normal step values PASS stepMismatchFor("2010-W03", "2", "2010-W02") is true PASS stepMismatchFor("2010-W02", "2", "2010-W02") is false PASS stepMismatchFor("2010-W04", "2", "2010-W02") is false PASS stepMismatchFor("1800-W11", "3", "1800-W09") is true PASS stepMismatchFor("1800-W09", "3", "1800-W09") is false PASS stepMismatchFor("1800-W12", "3", "1800-W09") is false PASS stepMismatchFor("275760-W35", "3", "275760-W33") is true PASS stepMismatchFor("275760-W35", "2", "275760-W33") is false Implicit step base PASS stepMismatchFor("1970-W01", "2", null) is false PASS stepMismatchFor("1970-W02", "2", null) is true PASS stepMismatchFor("1970-W03", "2", null) is false PASS stepMismatchFor("1970-W04", "2", null) is true Fractional step values PASS stepMismatchFor("2010-W03", "0.1", "2010-W02") is false PASS stepMismatchFor("2010-W03", "1.1", "2010-W02") is false PASS stepMismatchFor("2010-W03", "1.9", "2010-W02") is true Invalid or no step values PASS stepMismatchFor("2010-W03", null, "2010-W02") is false PASS stepMismatchFor("2010-W03", "-1", "2010-W02") is false PASS stepMismatchFor("2010-W03", "foo", "2010-W02") is false Special step value PASS stepMismatchFor("2010-W03", "any", "2010-W02") is false Disabled PASS stepMismatchFor("2010-W03", "2", "2010-W02", true) is true PASS successfullyParsed is true TEST COMPLETE