Use @Spy for the MockObserverListener.

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

@@ -5,12 +5,20 @@ import static org.mockito.Mockito.*;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
 import org.leumasjaffe.mock.MockObserverListener;
 import org.leumasjaffe.observer.ObserverDispatch;
 import org.leumasjaffe.recipe.model.Amount;
 import org.leumasjaffe.recipe.model.Ingredient;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
 
+@ExtendWith(MockitoExtension.class)
+@RunWith(JUnitPlatform.class)
 class IngredientPanelTest extends SwingTestCase {
+	@Spy MockObserverListener listener;
 	Ingredient stuff;
 	IngredientPanel panel;
 	
@@ -18,6 +26,9 @@ class IngredientPanelTest extends SwingTestCase {
 	void setUp() {
 		stuff = new Ingredient("Onions", "Sliced", new Amount("100 g"));
 		panel = new IngredientPanel(stuff);
+		listener.setObserved(stuff);
+		// setObserved invokes our callback.
+		clearInvocations(listener);
 	}
 
 	@Test
@@ -46,13 +57,9 @@ class IngredientPanelTest extends SwingTestCase {
 	// TODO: I need to add hook-ups for the rest of the fields, too
 	@Test
 	void testViewUpdateSendsNotify() {
-		final MockObserverListener mock = spy(MockObserverListener.class);
-		mock.setObserved(stuff);
-		verify(mock, times(1)).updateWasSignalled();
-
 		panel.getTxtName().setText("Bacon");
 		waitForSwing();
-		verify(mock, times(2)).updateWasSignalled();
+		verify(listener).updateWasSignalled();
 	}
 
 }