Mockit是一个开源mock框架,官网:http://mockito.org/,源码:https://github.com/mockito/mockito
要使用Mockit,首先需要在我们工程中引入对应的jar包,对于maven工程而言,需要添加如下依赖项即可:
<dependency> <groupId>org.mockito</groupId> <artifactId>mockito-core</artifactId> <version>2.0.5-beta</version> </dependency>而在我们实际使用时,为了组织测试case的需要,我们可能还需要testng:
<dependency> <groupId>org.testng</groupId> <artifactId>testng</artifactId> <version>6.8.8</version> <scope>test</scope> </dependency>
Demo.java:
package com.anlegor.test; public class Demo { private String name ="laowang"; private int age; public Demo(String name, int age) { this.name = name; this.age = age; } public String speak(String str) { return str; } public String talk(String str) { return str; } public String methodNoParameters() { return name; } public String methodCustomParameters(ParameterClass parameter,String str) { return str; } public String methodHaveChildObj(ParameterClass parameter,String str) { parameter.childTalk(str); return str; } }
package com.anlegor.test; public class ParameterClass { public ParameterClass() { } public String childTalk(String str) { return str; } }
1、 构造无参函数的返回
/** * 测试无参数函数mock */ @Test(priority=0) public void testReturnDirect() { String mocked = "mocked Return"; Demo demo = Mockito.mock(Demo.class); Mockito.when(demo.methodNoParameters()).thenReturn(mocked); Assert.assertEquals(demo.methodNoParameters(), mocked); }
/** * 测试任意基本类型参数函数mock */ @Test(priority=1) public void testMethodWithParameter() { String word= "mocked Return"; Demo demo = Mockito.mock(Demo.class); Mockito.when(demo.speak(Mockito.anyString())).thenReturn(word); Assert.assertEquals(demo.speak("你好"), word); }
/** * 测试特定参数mock */ @Test(priority=2) public void testMethodWithSpecificParameter() { String word= "mocked Return"; Demo demo = Mockito.mock(Demo.class); Mockito.when(demo.speak(Mockito.matches(".*大爷$"))).thenReturn(word); Assert.assertEquals(demo.speak("隔壁李大爷"), word); }
/** * 测试自定义类型参数的mock */ @Test(priority=3) public void testMethodWithCustomParameter() { String word= "mocked Return"; Demo demo = Mockito.mock(Demo.class); Mockito.when(demo.methodCustomParameters(Mockito.argThat(new IsParameterClass()), Mockito.anyString())).thenReturn(word); Assert.assertEquals(demo.methodCustomParameters(new ParameterClass(), "你猜"), word); } //自定义一个与之匹配的matcher类 class IsParameterClass extends ArgumentMatcher<ParameterClass> { public boolean matches(Object para) { return para.getClass() == ParameterClass.class; } }
/** * 测试mock的函数返回null */ @Test(priority=4) public void testMethodWithReturnNull() { String word= "mocked Return"; Demo demo = Mockito.mock(Demo.class); Mockito.when(demo.speak(Mockito.anyString())).thenReturn(null); Assert.assertNotEquals(demo.speak("你猜"), word); }
/** * 测试mock的函数抛出异常 */ @Test(expectedExceptions=org.mockito.exceptions.base.MockitoException.class,priority=5) public void testMethodReturnException() { String word= "mocked Return"; Demo demo = Mockito.mock(Demo.class); Mockito.when(demo.speak(Mockito.anyString())).thenThrow(new Exception()); demo.speak("你猜"); }
/** * 测试mock的不同次调用返回不同的值 */ @Test(priority=6) public void testMethodMultiDiffReturn() { String word= "mocked Return 0"; String word1= "mocked Return 1"; Demo demo = Mockito.mock(Demo.class); Mockito.when(demo.speak(Mockito.anyString())).thenReturn(word).thenReturn(word1); Assert.assertEquals(demo.speak("你猜"), word); Assert.assertEquals(demo.speak("你猜"), word1); }
/** * 验证方法是否被mock且是否为所执行的参数调用 */ @Test(expectedExceptions= org.mockito.exceptions.misusing.NotAMockException.class,priority=7) public void testMockedMethodRun() { String word= "mocked Return"; Demo demo = Mockito.mock(Demo.class); Mockito.when(demo.speak(Mockito.anyString())).thenReturn(word); Assert.assertEquals(demo.speak("你猜"), word); Mockito.verify(demo.speak("你猜")); //下面这个参数的方法调用并没有被执行过,所以会抛出NotAMockException的异常 Mockito.verify(demo.speak("nicai")); }
当然,mockito的作用也不仅仅如上面,更详细的使用可以 参考它很详细的帮助文档:
http://site.mockito.org/mockito/docs/current/org/mockito/Mockito.html