Work on #385, created project and provided two mute methods

mute-idiom/src/test/java/com/iluwatar/mute/AppTest.java

@@ -0,0 +1,15 @@
+package com.iluwatar.mute;
+
+import org.junit.Test;
+
+/**
+ * Tests that Mute idiom example runs without errors.
+ *
+ */
+public class AppTest {
+
+  @Test
+  public void test() {
+    App.main(null);
+  }
+}

mute-idiom/src/test/java/com/iluwatar/mute/MuteTest.java

@@ -0,0 +1,62 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.mute;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+public class MuteTest {
+
+  private static final String MESSAGE = "should not occur";
+  
+  @Rule public ExpectedException exception = ExpectedException.none();
+  
+  @Test
+  public void muteShouldRethrowUnexpectedExceptionAsAssertionError() throws Exception {
+    exception.expect(AssertionError.class);
+    exception.expectMessage(MESSAGE);
+    
+    Mute.mute(() -> methodThrowingException());
+  }
+  
+  private void methodThrowingException() throws Exception {
+    throw new Exception(MESSAGE);
+  }
+  
+  @Test
+  public void loggedMuteShouldLogExceptionTraceBeforeSwallowingIt() throws IOException {
+    ByteArrayOutputStream stream = new ByteArrayOutputStream();
+    System.setErr(new PrintStream(stream));
+    
+    Mute.loggedMute(() -> methodThrowingException());
+    
+    assertTrue(new String(stream.toByteArray()).contains(MESSAGE));
+  }
+}