#502 Adjusted tests for logger introduction

model-view-controller/src/test/java/com/iluwatar/model/view/controller/GiantViewTest.java

@@ -22,15 +22,19 @@
  */
 package com.iluwatar.model.view.controller;
 
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.AppenderBase;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
+import org.slf4j.LoggerFactory;
 
-import java.io.PrintStream;
+import java.util.LinkedList;
+import java.util.List;
 
+import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.verifyNoMoreInteractions;
 
 /**
  * Date: 12/20/15 - 2:04 PM
@@ -39,32 +43,16 @@ import static org.mockito.Mockito.verifyNoMoreInteractions;
  */
 public class GiantViewTest {
 
-  /**
-   * The mocked standard out {@link PrintStream}, required since the actions of the views don't have
-   * any influence on any other accessible objects, except for writing to std-out using {@link
-   * System#out}
-   */
-  private final PrintStream stdOutMock = mock(PrintStream.class);
+  private InMemoryAppender appender;
 
-  /**
-   * 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);
+    appender = new InMemoryAppender(GiantView.class);
   }
 
-  /**
-   * Removed the mocked std-out {@link PrintStream} again from the {@link System} class
-   */
   @After
   public void tearDown() {
-    System.setOut(this.stdOutOrig);
+    appender.stop();
   }
 
   /**
@@ -78,9 +66,29 @@ public class GiantViewTest {
     final GiantModel model = mock(GiantModel.class);
     view.displayGiant(model);
 
-    verify(this.stdOutMock).println(model);
-    verifyNoMoreInteractions(model, this.stdOutMock);
-
+    assertEquals(model.toString(), appender.getLastMessage());
+    assertEquals(1, appender.getLogSize());
   }
 
-}
+  public class InMemoryAppender extends AppenderBase<ILoggingEvent> {
+    private List<ILoggingEvent> log = new LinkedList<>();
+
+    public InMemoryAppender(Class clazz) {
+      ((Logger) LoggerFactory.getLogger(clazz)).addAppender(this);
+      start();
+    }
+
+    @Override
+    protected void append(ILoggingEvent eventObject) {
+      log.add(eventObject);
+    }
+
+    public String getLastMessage() {
+      return log.get(log.size() - 1).getMessage();
+    }
+
+    public int getLogSize() {
+      return log.size();
+    }
+  }
+}