/**
* Asserts the use case of specifying null on construction for the detail type of the detail list.
*
* @throws Exception
*/
public void testElementTypeNull() throws Exception {
WritableValue observableValue =
new WritableValue(new WritableList(new ArrayList(), Object.class), null);
WritableListFactory factory = new WritableListFactory();
DetailObservableList detailObservable =
new DetailObservableList(factory, observableValue, null);
assertNull(detailObservable.getElementType());
// change the type returned from the factory
factory.type = String.class;
observableValue.setValue(new WritableList(new ArrayList(), String.class));
assertNull("element type not null", detailObservable.getElementType());
}
/**
* Asserts that you can't change the type across multiple inner observables.
*
* @throws Exception
*/
public void testElementTypeNotNull() throws Exception {
WritableValue observableValue =
new WritableValue(new WritableList(new ArrayList(), Object.class), null);
WritableListFactory factory = new WritableListFactory();
DetailObservableList detailObservable =
new DetailObservableList(factory, observableValue, Object.class);
assertEquals(factory.type, detailObservable.getElementType());
try {
factory.type = String.class;
observableValue.setValue(
new WritableList(Arrays.asList(new Object[] {new Object()}), String.class));
fail("if an element type is set this cannot be changed");
} catch (AssertionFailedException e) {
}
}
