### Question:
GuiceFxmlLoader implements IFxmlLoaderProvider { @Inject public GuiceFxmlLoader(Injector injector) { if (injector == null) { throw new IllegalArgumentException("Injector must not be null."); } this.injector = injector; } @Inject  GuiceFxmlLoader(Injector injector);  GuiceFxmlLoader(); @Override FXMLLoader create(final String fxmlFile); @Override FXMLLoader create(final String fxmlFile, Injector injector);  }### Answer:
@Test(expected = IllegalArgumentException.class) public void testGuiceFxmlLoader() { new GuiceFxmlLoader(null); }