### Question:
LoincLabOrderValues { public static boolean isValid(String loincNumber) { return values.containsKey(loincNumber); }  static List<LoincLabOrderValue> getAllValues(); static boolean isValid(String loincNumber); static LoincLabOrderValue get(String loincNumber);  }### Answer:
@Test public void should_determine_that_loinc_number_is_available() { assertTrue(LoincLabOrderValues.isValid("49054-0")); }
@Test public void should_determine_that_loinc_number_is_unavailable() { assertFalse(LoincLabOrderValues.isValid("XXXXXXX")); assertFalse(LoincLabOrderValues.isValid("")); assertFalse(LoincLabOrderValues.isValid(null)); }