Use JUnit expected exception feature to test a unit that might throw an exception in given situation or for a given input.
package com.ourownjava.unit.under.test; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertNotNull; import static org.junit.Assert.assertTrue; import static org.junit.Assert.fail; import java.util.List; import org.junit.Before; import org.junit.Test; import com.ourownjava.exception.NoAppleException; import com.ourownjava.model.Apple; /** * * @author Sanju Thomas * */ public class AppleServiceTest { private AppleService appleService; @Before public void setUp(){ appleService = new AppleService(); } //This one is not a good practice @Test public void shouldGetNoAppleException_(){ try { final Listapples = appleService.getApple(101); } catch (Exception e) { assertTrue(e instanceof NoAppleException); } } //This one is a good practice @Test(expected = NoAppleException.class) public void shouldGetNoAppleException() throws NoAppleException{ final List apples = appleService.getApple(101); fail("Expected NoAppleException"); } } package com.ourownjava.unit.under.test; import java.util.ArrayList; import java.util.List; import com.ourownjava.exception.NoAppleException; import com.ourownjava.model.Apple; /** * * @author Sanju Thomas * */ public class AppleService { private static final Integer MAX_APPLE_LOT = 100; public List getApple(final Integer numberOfApples) throws NoAppleException{ if(numberOfApples> MAX_APPLE_LOT){ throw new NoAppleException(); } final List apples = new ArrayList (); for(int i = 0; i < numberOfApples; i++){ final Apple apple = new Apple(); apples.add(apple); } return apples; } } package com.ourownjava.exception; /** * * @author Sanju Thomas * */ public class NoAppleException extends Exception { private static final long serialVersionUID = 1L; public NoAppleException(){ super("Your eyes doesn't meet the stomach"); } } package com.ourownjava.model; /** * * @author Sanju Thomas * */ public class Apple {}
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