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<a name="ch18"></a>
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<h2 class="first-section-title"><a name="586"></a><a name="ch18lev1sec3"></a>Test Case Coding Overview and Examples</h2><a name="587"></a><a name="IDX-246"></a>
<p class="para">The mechanics of setting up a JUnit test case are relatively straightforward. All test cases extend <span class="fixed">junit.framework.TestCase</span>. You need to override the <span class="fixed">runTest()</span> method, which performs pretest processing, the test itself, and posttest processing. I usually code a <span class="fixed">main()</span> so the test case can be run and debugged outside the test suite. <a class="internaljump" href="#ch18list01">Listing 18.1</a> is an example of a test case from a ProjectTrak data access object.</p>
<div class="example">
<span class="example-title"><span class="example-titlelabel">Listing 18.1: </span>Sample Test Case for a Data Access Object</span><a name="588"></a><a name="ch18list01"></a>
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<td bgcolor="000080" class="bluecell"><font size="2" face="Arial" color="010100"><b><img src="_.gif" width="1" height="2" alt="Start example" border="0"></b></font></td>
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<pre class="literallayout">
1:package test.dvt.app.project.dao;
2:
3:import com.dvt.app.project.dao.ProjectTaskDAO;
4:import com.dvt.app.project.vo.ProjectTaskVO;
5:
6:import org.cementj.util.DatabaseUtility;
7:import org.cementj.base.DataNotFoundException;
8:import junit.framework.TestCase;
9:
10:import java.sql.Connection;
11:
12:public class TestProjectTaskDAO extends TestCase
13:{
14:
15: public TestProjectTaskDAO()
16: {
17: super("ProjectTaskDAO unit tests");
18: }
19:
20: protected void setUp() throws java.lang.Exception
21: {
22: super.setUp();
23: _dbConnection =
24: DatabaseUtility.getOracleJDBCConnection
25: ( "localhost", 1521, "ORA92",
26: "scott", "tiger");
27: }
28:
29: protected void runTest() throws java.lang.Throwable
30: {
31: try
32: {
33: this.setUp();
34: ProjectTaskDAO dao =
35: new ProjectTaskDAO(_dbConnection);
36:<a name="589"></a><a name="IDX-247"></a>
37: ProjectTaskVO taskVO = null;
38:
39: // Test for data not found.
40: boolean dataNotFound = false;
41: try {taskVO = dao.getProjectTask(77777);}
42: catch (DataNotFoundException d)
43: {
44: dataNotFound = true;
45: }
46: TestCase.assertTrue("Test 1: Not found test",
47: dataNotFound);
48:
49: // test for data found
50: taskVO = dao.getProjectTask(11111);
51: TestCase.assertTrue("Test 2: Select test",
52: taskVO != null);
53:
54: // test for task save
55: taskVO.setTaskId(77777);
56: dao.saveProjectTask(taskVO);
57: ProjectTaskVO newTaskVO =
58: dao.getProjectTask(77777);
59: TestCase.assertTrue("Test 3: Insert test",
60: newTaskVO.equals(taskVO));
61:
62: // test for delete
63: dao.deleteProjectTask(77777);
64: dataNotFound = false;
65: try {taskVO = dao.getProjectTask(77777);}
66: catch (DataNotFoundException d)
67: {
68: dataNotFound = true;
69: }
70: TestCase.assertTrue("Test 4: Delete test",
71: dataNotFound);
72: }
73: finally
74: {
75: this.tearDown();
76: }
77: }
78:
79: protected void tearDown() throws java.lang.Exception
80: {
81: super.tearDown();
82: DatabaseUtility.close(_dbConnection);
83: }
84:
85: private Connection _dbConnection = null;<a name="590"></a><a name="IDX-248"></a>
86:
87: public static void main(String[] args)
88: {
89: TestProjectTaskDAO test = new TestProjectTaskDAO();
90:
91: try
92: {
93: test.runTest();
94: }
95: catch (Throwable t) {t.printStackTrace();}
96: }
97:}
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<p class="para">I usually put the database connection creation in the setup() method override and the close in the teardown() method override.</p>
<p class="para">Here are a few things to note from the example in <a class="internaljump" href="#ch18list01">listing 18.1</a>:</p>
<ul class="itemizedlist">
<li class="first-listitem">
<p class="first-para">The test is self-contained for the most part.</p>
</li>
<li class="listitem">
<p class="first-para">All assertions and the test case are uniquely labeled so developers can find them easily if they fail in the test suite.</p>
</li>
<li class="listitem">
<p class="first-para">The test case is in a package that only contains test cases and supporting classes.</p>
</li>
<li class="listitem">
<p class="first-para">The test case is named so it's easy for other developers to find.</p>
</li>
</ul>
<div class="section">
<h3 class="sect3-title">
<a name="591"></a><a name="ch18lev2sec1"></a>Combining Test Cases into Suites</h3>
<p class="first-para">I've mentioned that it's fairly easy to combine <span class="fixed">TestCase</span> classes into test suites. JUnit implements this capability via its <span class="fixed">TestSuite</span> class. Once it's instantiated and loaded with <span class="fixed">TestCase</span>, the <span class="fixed">TestSuite</span> class can be run via JUnit's <span class="fixed">TestRunner</span> class, which is a GUI utility. <a class="internaljump" href="#ch18list02">Listing 18.2</a> is a sample test suite from one of my open source products.</p>
<div class="example">
<span class="example-title"><span class="example-titlelabel">Listing 18.2: </span>Sample Test Suite from ThreadWorks</span><a name="592"></a><a name="ch18list02"></a>
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<td bgcolor="000080" class="bluecell"><font size="2" face="Arial" color="010100"><b><img src="_.gif" width="1" height="2" alt="Start example" border="0"></b></font></td>
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<pre class="literallayout">
1:public class ThreadworksTestSuite {
2:
3: public ThreadworksTestSuite() {}
4:
5: public static Test suite()
6: {
7: TestSuite suite= new TestSuite("Threadworks");
8:
9: suite.addTest(new InstantiationTest() );
10: suite.addTest(new SingleTaskWithoutNotification() );
11: suite.addTest(new SingleTaskWithNotification() );<a name="593"></a><a name="IDX-249"></a>
12: suite.addTest(new TerminationTest() );
13: suite.addTest(new GroupTaskWithNotification() );
14: suite.addTest(new GroupTaskWithoutNotification() );
15: suite.addTest(
16: new TaskCollectionWithNotification() );
17: suite.addTest(
18: new TaskCollectionWithoutNotification() );
19: suite.addTest(new SuccessorTasksWithNotification() );
20: suite.addTest(
21: new ScheduleNonRecurringWithoutDependencies() );
22: suite.addTest(
23: new ScheduleNonRecurringWithDependencies() );
24:
25: return suite;
26: }
27:
28: public static void main(String[] argv)
29: {
30: junit.swingui.TestRunner.run(
31: ThreadworksTestSuite.class);
32:
33: }
34:}
</pre>
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