Mockito测试实例

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。

Java代码


/**

* Mockito测试使用实例

*

* @author badqiu

* @email badqiu(a)gmail.com

*

*/

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");

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);

}

}