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copied!<p>This should help-> Mocking a private static method on a class</p> <p><a href="http://avricot.com/blog/index.php?post/2011/01/25/powermock-%3A-mocking-a-private-static-method-on-a-class" rel="nofollow">http://avricot.com/blog/index.php?post/2011/01/25/powermock-%3A-mocking-a-private-static-method-on-a-class</a></p> <p>Here's my code for your class. I modified your CUT too.</p> <p>TEST CLASS:</p> <pre><code>import org.easymock.EasyMock; import org.junit.Assert; import org.junit.Before; import org.junit.Test; import org.junit.runner.RunWith; import org.powermock.api.easymock.PowerMock; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; @RunWith(PowerMockRunner.class) @PrepareForTest({ NumberUtility.class }) public class NumberUtilityTest { // Class Under Test NumberUtility cut; @Before public void setUp() { // Create a new instance of the service under test (SUT). cut = new NumberUtility(); // Common Setup // TODO } /** * Partial mocking of a private method. * * @throws Exception * */ @Test public void testGetNumberPlusOne1() throws Exception { /* Initialization */ PowerMock.mockStaticPartial(NumberUtility.class, "doSomethingFancyInternally"); NumberUtility partialMockCUT = PowerMock.createPartialMock( NumberUtility.class, "doSomethingFancyInternally"); Integer doSomethingFancyInternallyOutput = 1; Integer input = 0; /* Mock Setup */ PowerMock .expectPrivate(partialMockCUT, "doSomethingFancyInternally", EasyMock.isA(Integer.class)) .andReturn(doSomethingFancyInternallyOutput).anyTimes(); /* Activate the Mocks */ PowerMock.replayAll(); /* Test Method */ Integer result = NumberUtility.getNumberPlusOne(input); /* Asserts */ Assert.assertEquals(doSomethingFancyInternallyOutput, result); PowerMock.verifyAll(); } } </code></pre> <p>CUT: public final class NumberUtility{</p> <pre><code>public static Integer getNumberPlusOne(Integer num){ return doSomethingFancyInternally(num);} private static Integer doSomethingFancyInternally(Integer num){ //Fancy code here... return num;} } </code></pre>

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