最强Mock框架介绍: Mockito

Mockito是现在java领域中,用java语言编写的测试代码保持最简洁的一个mock框架(不与groovy等比较)。相比easymock,jmock,编写出来的代码更加容易阅读。无需录制mock方法调用就返回默认值是很大一个优势。

 

以下为实际的精简测试用例使用，相比较其它mock框架，更加容易阅读。更加符合DSL。

 

 

/** 
 * Mockito测试使用实例 
 *  
 * 
 */  
public class MockitoListTest extends Assert{  
      
    List<String> mockList = mock(List.class);  
      
    @Test //标准测试  
    public void test_3A() {  
	
        //arrange  
        when(mockList.get(0)).thenReturn("one");  
        when(mockList.get(1)).thenReturn("two");  
          
        //action  
        String result1 = mockList.get(0);  
          
        //assert  
        assertEquals(result1,"one");  
        verify(mockList).get(0);  
    }  
      
    @Test //返回默认值，无需录制动作  
    public void test_default_value_return_by_mockito() {  
        //action  
        String result1 = mockList.get(0);  
          
        //assert  
        assertEquals(result1,null);  
        verify(mockList).get(0);  
    }  
      
    @Test //参数的精确匹配及模糊匹配any()  
    public void test_arguments_matche() {  
        // 参数匹配,使用的eq()等参数匹配，则必须全部使用匹配符,不使用则不用  
        // eq() any() anyInt() anyObject() anyMap() anyCollection()  
        when(mockList.get(anyInt())).thenReturn("return me by anyInt()");  
          
        for(int i = 0; i < 100; i++) {  
            assertEquals("return me by anyInt()",mockList.get(i));  
        }  
    }  
      
    @Test //调用次数不同，返回值也不同  
    public void test_return_different_values_by_call_times() {  
        when(mockList.get(0)).thenReturn("1").thenReturn("2");  
        System.out.println();  
        assertEquals(mockList.get(0),"1");  
        assertEquals(mockList.get(0),"2");  
    }  
      
    @Test //验证方法调用次数  
    public void verify_how_many_times_a_method_is_called() {  
          
        mockList.get(0);  
        mockList.get(2);  
        mockList.get(2);  
        mockList.get(2);  
          
        //方法调用次数验证  
        verify(mockList,atLeastOnce()).get(0);  
        verify(mockList,never()).get(1);  
        verify(mockList,times(3)).get(2);  
    }  
      
    // 没有返回值的方法 exception 抛出  
    @Test(expected=IllegalStateException.class)  
    public void test_throw_exception_with_not_return_value_method() {  
          
        doThrow(new IllegalStateException("please not invocke clear() ")).when(mockList).clear();  
          
        mockList.clear();  
    }  
      
    // 有返回值的方法 exception 抛出  
    @Test(expected=IllegalStateException.class)  
    public void test_throw_exception_with_has_return_value_method() {  
        when(mockList.remove(1)).thenThrow(new IllegalStateException("I has return value"));  
          
        mockList.remove(1);  
    }  
      
}

作者: "唐山"