Added tests for template-method pattern

template-method/src/test/java/com/iluwatar/templatemethod/HalflingThiefTest.java

@@ -0,0 +1,50 @@
+package com.iluwatar.templatemethod;
+
+import org.junit.Test;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+/**
+ * Date: 12/29/15 - 18:15 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class HalflingThiefTest {
+
+  /**
+   * Verify if the thief uses the provided stealing method
+   */
+  @Test
+  public void testSteal() {
+    final StealingMethod method = mock(StealingMethod.class);
+    final HalflingThief thief = new HalflingThief(method);
+
+    thief.steal();
+    verify(method).steal();
+
+    verifyNoMoreInteractions(method);
+  }
+
+  /**
+   * Verify if the thief uses the provided stealing method, and the new method after changing it
+   */
+  @Test
+  public void testChangeMethod() {
+    final StealingMethod initialMethod = mock(StealingMethod.class);
+    final HalflingThief thief = new HalflingThief(initialMethod);
+
+    thief.steal();
+    verify(initialMethod).steal();
+
+    final StealingMethod newMethod = mock(StealingMethod.class);
+    thief.changeMethod(newMethod);
+
+    thief.steal();
+    verify(newMethod).steal();
+
+    verifyNoMoreInteractions(initialMethod, newMethod);
+
+  }
+}