Fix test failure.

src/test/java/org/leumasjaffe/recipe/view/ElementPanelTest.java

@@ -12,6 +12,7 @@ import org.junit.runner.RunWith;
 import org.leumasjaffe.mock.MockObserverListener;
 import org.leumasjaffe.observer.ObserverDispatch;
 import org.leumasjaffe.recipe.model.Phase;
+import org.leumasjaffe.recipe.model.CollatedDuration;
 import org.leumasjaffe.recipe.model.Element;
 import org.mockito.Mock;
 import org.mockito.Spy;
@@ -29,6 +30,7 @@ class ElementPanelTest extends SwingTestCase {
 	@BeforeEach
 	void setUp() {
 		doReturn(Arrays.asList(stub)).when(stuff).getPhases();
+		doReturn(CollatedDuration.ZERO).when(stuff).getCollatedDuration();
 		panel = new ElementPanel(stuff);
 		
 		listener.setObserved(stuff);