Mockito：一个强大的用于Java开发的模拟测试框架 - 51Testing软件测试论坛

[java] view plain copyimport java.util.ArrayList; public class Counter { public Counter() { } public int count(ArrayList items) { int results = 0; for(Object curItem : items) { results ++; } return results; } }

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步骤 2: 添加java源码
类Person.java：
[java] view plain copypackage mockitodemo; public class Person { private final Integer personID; private final String personName; public Person( Integer personID, String personName ) { this.personID = personID; this.personName = personName; } public Integer getPersonID() { return personID; } public String getPersonName() { return personName; } } 　　接口PersonDAO.java：[java] view plain copypackage mockitodemo; public interface PersonDao { public Person fetchPerson( Integer personID ); public void update( Person person ); } 　　类PersonService.java：[java] view plain copypackage mockitodemo; public class PersonService { private final PersonDao personDao; public PersonService( PersonDao personDao ) { this.personDao = personDao; } public boolean update( Integer personId, String name ) { Person person = personDao.fetchPerson( personId ); if( person != null ) { Person updatedPerson = new Person( person.getPersonID(), name ); personDao.update( updatedPerson ); return true; } else { return false; } } }

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[java] view plain copypackage mockitodemo; import org.junit.After; import org.junit.AfterClass; import org.junit.Before; import org.junit.BeforeClass; import org.junit.Test; import static org.junit.Assert.*; import org.mockito.Mock; import org.mockito.MockitoAnnotations; import org.mockito.ArgumentCaptor; import static org.mockito.Mockito.*; /** * PersonService的单元测试用例 * * @author jackzhou */ public class PersonServiceTest { @Mock private PersonDao personDAO; // 模拟对象 private PersonService personService; // 被测类 public PersonServiceTest() { } @BeforeClass public static void setUpClass() { } @AfterClass public static void tearDownClass() { } // 在@Test标注的测试方法之前运行 @Before public void setUp() throws Exception { // 初始化测试用例类中由Mockito的注解标注的所有模拟对象 MockitoAnnotations.initMocks(this); // 用模拟对象创建被测类对象 personService = new PersonService(personDAO); } @After public void tearDown() { } @Test public void shouldUpdatePersonName() { Person person = new Person(1, "Phillip"); // 设置模拟对象的返回预期值 when(personDAO.fetchPerson(1)).thenReturn(person); // 执行测试 boolean updated = personService.update(1, "David"); // 验证更新是否成功 assertTrue(updated); // 验证模拟对象的fetchPerson(1)方法是否被调用了一次 verify(personDAO).fetchPerson(1); // 得到一个抓取器 ArgumentCaptor<Person> personCaptor = ArgumentCaptor.forClass(Person.class); // 验证模拟对象的update()是否被调用一次，并抓取调用时传入的参数值 verify(personDAO).update(personCaptor.capture()); // 获取抓取到的参数值 Person updatePerson = personCaptor.getValue(); // 验证调用时的参数值 assertEquals("David", updatePerson.getPersonName()); // asserts that during the test, there are no other calls to the mock object. // 检查模拟对象上是否还有未验证的交互 verifyNoMoreInteractions(personDAO); } @Test public void shouldNotUpdateIfPersonNotFound() { // 设置模拟对象的返回预期值 when(personDAO.fetchPerson(1)).thenReturn(null); // 执行测试 boolean updated = personService.update(1, "David"); // 验证更新是否失败 assertFalse(updated); // 验证模拟对象的fetchPerson(1)方法是否被调用了一次 verify(personDAO).fetchPerson(1); // 验证模拟对象是否没有发生任何交互 verifyZeroInteractions(personDAO); // 检查模拟对象上是否还有未验证的交互 verifyNoMoreInteractions(personDAO); } /** * Test of update method, of class PersonService. */ @Test public void testUpdate() { System.out.println("update"); Integer personId = null; String name = "Phillip"; PersonService instance = new PersonService(new PersonDao() { @Override public Person fetchPerson(Integer personID) { System.out.println("Not supported yet."); return null; } @Override public void update(Person person) { System.out.println("Not supported yet."); } }); boolean expResult = false; boolean result = instance.update(personId, name); assertEquals(expResult, result); // TODO review the generated test code and remove the default call to fail. fail("The test case is a prototype."); } }

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