Powermock私有方法

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简单笔记下，如有以下待测方法callSumXX，其调用了private方法sumXX

可以直接mock掉callSumXX，传送门：Mockito在Maven junit测试中的应用

如果方法中还有其他待测逻辑等原因不能直接mock掉的话，这里就需要去mock被调用的private方法。

public class Calculator {    private int sumXX(int a, int b) {return a + b;}        public int callSumXX(int a, int b){    return sumXX(a, b);    }}

1.powermock private method的方法

spy被测类：

Calculator powerMock = PowerMockito.spy(new Calculator());

构造返回：

PowerMockito.when(powerMock, "sumXX", 1, 2).thenReturn(2);

断言：

assertEquals(2, powerMock.callSumXX(1, 2));

完整代码如下：

@RunWith(PowerMockRunner.class)@PrepareForTest({Calculator.class})public class CalculatorTest {private Calculator test;@BeforeClasspublic static void setUpBeforeClass() throws Exception {}@AfterClasspublic static void tearDownAfterClass() throws Exception {}@Beforepublic void setUp() throws Exception {test = new Calculator();}@Afterpublic void tearDown() throws Exception {}@Testpublic void testSumXX() throws Exception {Calculator powerMock = PowerMockito.spy(new Calculator());PowerMockito.when(powerMock, "sumXX", 1, 2).thenReturn(2);assertEquals(2, powerMock.callSumXX(1, 2));}}

测试发现pass了

说明private方法sumXX被成功mock（1+2=2）

2.需要注意的几个问题

a.需要加入@RunWith和@PrepareForTest，见上面的完整代码

b.PowerMockito需要配合Mockito使用，这里版本有对应关系要求：

Mockito                     | PowerMock------------------------------------------------------------------------------2.0.0-beta - 2.0.42-beta    |   1.6.5+------------------------------------------------------------------------------1.10.19                     |   1.6.41.10.8 - 1.10.x             |   1.6.2+1.9.5-rc1 - 1.9.5           |   1.5.0 - 1.5.61.9.0-rc1 & 1.9.0           |   1.4.10 - 1.4.121.8.5                       |   1.3.9 - 1.4.91.8.4                       |   1.3.7 & 1.3.81.8.3                       |   1.3.61.8.1 & 1.8.2               |   1.3.51.8                         |   1.31.7                         |   1.2.5

否则可能出现错误如：
java.lang.NoSuchMethodError:org.mockito.internal.creation.MockSettingsImpl.setMockName(Lorg/mockito/mock/MockName;)Lorg/mockito/internal/creation/settings/CreationSettings

c.maven中powermock的引入：

  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <powermock.version>1.6.4</powermock.version>  </properties><dependency>      <groupId>org.powermock</groupId>      <artifactId>powermock-module-junit4</artifactId>      <version>${powermock.version}</version>      <scope>test</scope>   </dependency>   <dependency>      <groupId>org.powermock</groupId>      <artifactId>powermock-api-mockito</artifactId>      <version>${powermock.version}</version>      <scope>test</scope>   </dependency>

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