Add proper unit tests for dependency-injection pattern

dependency-injection/src/test/java/com/iluwatar/dependency/injection/AdvancedWizardTest.java

@@ -0,0 +1,40 @@
+package com.iluwatar.dependency.injection;
+
+import org.junit.Test;
+
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+/**
+ * Date: 12/10/15 - 8:40 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class AdvancedWizardTest extends StdOutTest {
+
+  /**
+   * Test if the {@link AdvancedWizard} smokes whatever instance of {@link Tobacco} is passed to him
+   * through the constructor parameter
+   */
+  @Test
+  public void testSmokeEveryThing() throws Exception {
+
+    final Tobacco[] tobaccos = {
+        new OldTobyTobacco(), new RivendellTobacco(), new SecondBreakfastTobacco()
+    };
+
+    for (final Tobacco tobacco : tobaccos) {
+      final AdvancedWizard advancedWizard = new AdvancedWizard(tobacco);
+      advancedWizard.smoke();
+
+      // Verify if the wizard is smoking the correct tobacco ...
+      verify(getStdOutMock(), times(1)).println("AdvancedWizard smoking " + tobacco.getClass().getSimpleName());
+
+      // ... and nothing else is happening.
+      verifyNoMoreInteractions(getStdOutMock());
+    }
+
+  }
+
+}