@Test
public void testDiffDefinitions() {

    List<IPattern> definition1 = Arrays.asList(new FactPattern("Mock1"));
    column1.setDefinition(definition1);
    List<IPattern> definition2 = Arrays.asList(new FactPattern("Mock2"));
    column2.setDefinition(definition2);
    checkSingleDiff(FIELD_DEFINITION, definition1, definition2, column1, column2);
    assertNotEquals(column1, column2);
}