public void test_withLatestFixed_nulls() {
   VersionCorrection test = VersionCorrection.of(null, null);
   assertEquals(VersionCorrection.of(INSTANT3, INSTANT3), test.withLatestFixed(INSTANT3));
 }
 // -------------------------------------------------------------------------
 public void test_withLatestFixed_noNulls() {
   VersionCorrection test = VersionCorrection.of(INSTANT1, INSTANT2);
   assertSame(test, test.withLatestFixed(INSTANT3));
 }