import org.jmock.Expectations; import org.jmock.Mockery; import org.junit.Test; public class JMockExampleTest { @Test public void testJMockExample() { Mockery context = new Mockery(); final DatabaseConnection mockedConnection = context.mock(DatabaseConnection.class); context.checking(new Expectations() {{ \tallowing(mockedConnection).connect(); will(returnValue(true)); \tallowing(mockedConnection).executeQuery("SELECT * FROM users"); will(returnValue("User1, User2, User3")); }}); DatabaseService databaseService = new DatabaseService(); databaseService.setConnection(mockedConnection); boolean isConnected = databaseService.connectToDatabase(); String queryResult = databaseService.executeQuery("SELECT * FROM users"); context.assertIsSatisfied(); assertEquals(true, isConnected); assertEquals("User1, User2, User3", queryResult); } }