junit in eclipse
DESCRIPTION
JUNIT in Eclipse. Pepper Credit to Eclipse Documentation http://help.eclipse.org/juno/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2FgettingStarted%2Fqs-junit.htm. Purpose. Create test case classes to test individual classes or small groups - PowerPoint PPT PresentationTRANSCRIPT
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JUNIT in Eclipse
PepperCredit to Eclipse Documentation
http://help.eclipse.org/juno/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2FgettingStarted%2Fqs-junit.htm
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Purpose
• Create test case classes to test individual classes or small groups– Easy to hook test classes to the classes being
tested
• Test building tools inside Junit class• Easy to rerun one set of tests or all tests in the
entire system.• Easy to supress tests in production
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Startup
• Create a project if you do not have one (file -> New -> Project)
• Create a folder for your test cases (optional) • Create a test case for a class you intend to
write (file -> new -> Junit Test Case)• Choose the type (new junit4 test) and name
your test class• You can indicate the name of the class being
tested, but only after it is created
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Test Case Creation Screen
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How to Create a Test Method
• Type @Test to override the test method• Type test method header -> public void
test2() • Code the test to just invoke the fail method
public void testFailure() throws Exception { fail();}
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Running a test method
• Hit the run button. – Or Run as -> Junit test on
project or class• Junit Test runs• See results in JUnitView– Failure tab– Tab for all tests as a tree– * = changed code after running
test
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Test Result Checking
http://www.vogella.com/tutorials/JUnit/article.html•assertEquals() : object comparison using equals method•assertTrue() / assertFalse() : compare to boolean value•assertNull() / assertNotNull() : is the variable null•assertSame() / assertNotSame(): reference same object address•assertThat - uses matcher
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Let's Try• Write a simple class to be tested:package testProject;
public class aprogram {int x = 1;public int myfun (int y){x = x + 1; return x;}
}
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Now code a few testspackage JUnitTest;import static org.junit.Assert.*;import org.junit.Test;import testProject.aprogram;
public class TestFailure {
@Testpublic void test1() {
aprogram a = new aprogram();aprogram b = new aprogram(); assertTrue( b.myfun(3) == 2 );assertTrue( a.myfun(3) == 3 );
}@Testpublic void test2() {
//fail("Not yet implemented");aprogram a = new aprogram();aprogram b = new aprogram();assertTrue( b.myfun(3) == 4 );//assertTrue( a.myfun(3) == 1 );
}}
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Run the Tests
• See how it points to problem test• See how one failure in a test class stops the
running of the next one• Make both succeed• Make both fail
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Create a Test Suite
• File -> New -> Java -> Junit -> Junit Test Suite • Name the suite (AllTests)• Select test classes to run