### Question:
PredefinedFields { public static boolean isFieldObjectType(String fieldName){ return OBJECTTYPE_FIELD.equalsIgnoreCase(fieldName); } private  PredefinedFields(); static void ensurePredefinedFields(EntityMetadata md); static void updateArraySizes(EntityMetadata md, JsonNodeFactory factory, JsonDoc doc); static boolean isFieldObjectType(String fieldName); static boolean isFieldAnArrayCount(String fieldName, Fields metadataFields); static boolean isPredefinedField(String fieldName, Fields fields); static String createArrayFieldNameFromCountField(String countField); static String createArrayCountFieldName(String arrayFieldName); static final String OBJECTTYPE_FIELD; static final String FIELD_ARRAY_COUNT_POSTFIX; static final Path OBJECTTYPE_PATH; }### Answer:
@Test public void testIsFieldObjectType_True(){ assertTrue(PredefinedFields.isFieldObjectType(PredefinedFields.OBJECTTYPE_FIELD)); }
@Test public void testIsFieldObjectType_False(){ assertFalse(PredefinedFields.isFieldObjectType("NOT " + PredefinedFields.OBJECTTYPE_FIELD)); }
@Test public void testIsFieldObjectType_NullValue(){ assertFalse(PredefinedFields.isFieldObjectType(null)); }