Added tests for resource-acquisition-is-initialization pattern

resource-acquisition-is-initialization/pom.xml

@@ -14,5 +14,10 @@
       <artifactId>junit</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>

resource-acquisition-is-initialization/src/test/java/com/iluwatar/resource/acquisition/is/initialization/ClosableTest.java

+package com.iluwatar.resource.acquisition.is.initialization;
+
+import org.junit.Test;
+import org.mockito.InOrder;
+
+import static org.mockito.Mockito.inOrder;
+
+/**
+ * Date: 12/28/15 - 9:31 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public class ClosableTest extends StdOutTest {
+
+  @Test
+  public void testOpenClose() throws Exception {
+    final InOrder inOrder = inOrder(getStdOutMock());
+    try (final SlidingDoor door = new SlidingDoor(); final TreasureChest chest = new TreasureChest()) {
+      inOrder.verify(getStdOutMock()).println("Sliding door opens.");
+      inOrder.verify(getStdOutMock()).println("Treasure chest opens.");
+    }
+    inOrder.verify(getStdOutMock()).println("Treasure chest closes.");
+    inOrder.verify(getStdOutMock()).println("Sliding door closes.");
+    inOrder.verifyNoMoreInteractions();
+  }
+
+}
\ No newline at end of file

resource-acquisition-is-initialization/src/test/java/com/iluwatar/resource/acquisition/is/initialization/StdOutTest.java

+package com.iluwatar.resource.acquisition.is.initialization;
+
+import org.junit.After;
+import org.junit.Before;
+
+import java.io.PrintStream;
+
+import static org.mockito.Mockito.mock;
+
+/**
+ * Date: 12/10/15 - 8:37 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public abstract class StdOutTest {
+
+  /**
+   * The mocked standard out {@link PrintStream}, required since some actions don't have any
+   * influence on accessible objects, except for writing to std-out using {@link System#out}
+   */
+  private final PrintStream stdOutMock = mock(PrintStream.class);
+
+  /**
+   * Keep the original std-out so it can be restored after the test
+   */
+  private final PrintStream stdOutOrig = System.out;
+
+  /**
+   * Inject the mocked std-out {@link PrintStream} into the {@link System} class before each test
+   */
+  @Before
+  public void setUp() {
+    System.setOut(this.stdOutMock);
+  }
+
+  /**
+   * Removed the mocked std-out {@link PrintStream} again from the {@link System} class
+   */
+  @After
+  public void tearDown() {
+    System.setOut(this.stdOutOrig);
+  }
+
+  /**
+   * Get the mocked stdOut {@link PrintStream}
+   *
+   * @return The stdOut print stream mock, renewed before each test
+   */
+  final PrintStream getStdOutMock() {
+    return this.stdOutMock;
+  }
+
+}