AppTest.java

hmkcode · hmkcode · commit d325b9737a48 · 2013-05-20T11:13:23.000+03:00
AppTest.java
diff --git a/junit-exception/src/test/java/com/hmkcode/AppTest.java b/junit-exception/src/test/java/com/hmkcode/AppTest.java
@@ -0,0 +1,59 @@
+package com.hmkcode;
+
+import java.util.LinkedList;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.fail;
+import static org.hamcrest.CoreMatchers.is;
+
+
+
+@RunWith(JUnit4.class)
+public class AppTest 
+{
+  
+	 // ( 1 ) Simple way to test exception
+	 @Test(expected= NullPointerException.class) 
+	  public void testNull() { 
+	       String str = null;
+	       str.toUpperCase();
+	  }
+	 
+	 // ( 2 ) Test by tyr/catch (test exception message)
+	 @Test
+	 public void testExceptionMessage(){
+		 try{
+			 new LinkedList<Object>().get(0);
+
+			 //if no exception thrown the test will fail with the below message.
+			 fail("Expected an IndexOutOfBoundsException to be thrown");
+			 
+	      } catch (IndexOutOfBoundsException anIndexOutOfBoundsException) {
+	    	 
+	    	  //if no exception message is not the same the test will fail with the below message.
+	          assertThat(anIndexOutOfBoundsException.getMessage(), is("Index: 0, Size: 0"));
+	      }
+
+	 }
+	 
+	 //( 3 ) Test by @Rule & ExpectedException.expect() | ExpectedException.expectMessage()
+	  @Rule
+	  public ExpectedException thrown = ExpectedException.none();
+
+	  @Test
+	  public void testExceptionByRule() throws ArithmeticException {
+		  
+	        thrown.expect(ArithmeticException.class);
+	        thrown.expectMessage("/ by zero");
+	        
+	    	double d = 1 / 0;
+	   }
+
+
+}
