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。

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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。

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/**
 * 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);
	}
	
}