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下载地址：https://github.com/jayway/powermock/wiki/Downloads。下载" Mockito and JUnit including dependencies"版本。当前版本为”powermock-mockito-junit-1.6.3.zip"。
IntelliJ IDEA的设置如下：
右击工程，选择“Open Module Settings”
按下“ALT + Insert”，选择“Jars or directories...", 插入jar包：
点击OK。
在”Module Settings”对话框中点击“Sources”标签，右击右边底部面板，选择“New Folder...", 命名为test。
在”Module Settings”对话框中选择test，标识为Test Sources，关闭”Module Settings”对话框。
Eclipse中只需要上述jar包放在工程下的lib目录即可。
Maven在pom.xml添加如下内容：
下面创建EmployeeController类用于给Employee类执行Create, Read, Update, and Delete (CRUD)。实际工作由EmployeeService完成。getProjectedEmployeeCount方法预计公司员工每年增加20%，并返回近似取整。
public class EmployeeController { private EmployeeService employeeService; public EmployeeController(EmployeeService employeeService) { this.employeeService = employeeService; } public int getProjectedEmployeeCount() { final int actualEmployeeCount = employeeService.getEmployeeCount(); return (int) Math.ceil(actualEmployeeCount * 1.2); } public void saveEmployee(Employee employee) { employeeService.save(employee); } }
public class EmployeeService { public int getEmployeeCount() { throw new UnsupportedOperationException(); } public void save(Employee employee) { throw new UnsupportedOperationException(); } }
由于getEmployeeCount等方法没有真正实现，我们需要mock：
public class Employee { }
import static org.junit.Assert.*; import org.junit.Test; import org.mockito.Mockito; import org.powermock.api.mockito.PowerMockito; public class EmployeeControllerTest { @Test public void shouldReturnProjectedCountOfEmployeesFromTheService() { EmployeeService mock = PowerMockito.mock(EmployeeService.class); PowerMockito.when(mock.getEmployeeCount()).thenReturn(8); EmployeeController employeeController = new EmployeeController(mock); assertEquals(10, employeeController.getProjectedEmployeeCount()); } @Test public void shouldInvokeSaveEmployeeOnTheServiceWhileSavingTheEmployee() { EmployeeService mock = PowerMockito.mock(EmployeeService.class); EmployeeController employeeController = new EmployeeController(mock); Employee employee = new Employee(); employeeController.saveEmployee(employee); Mockito.verify(mock).saveEmployee(employee); } }
上面的saveEmployee(Employee)没有返回值，我们只需要用verify确认有调用即可。
另外有个非常用的MockSettings功能，用于设置mock名、实现额外接口(参见https://groups.google.com/forum/?fromgroups=#!topic/mockito/YM5EF0x90_4)、开启详细日志、注册listener用于mock时通知消息调用。比如：
EmployeeService mock = PowerMockito.mock(EmployeeService.class, Mockito.withSettings() .name("EmployeeServiceMock").verboseLogging());
修改类Employee:
public class Employee { public static int count() { throw new UnsupportedOperationException(); } }
新建EmployeeServiceTest类：
import static org.junit.Assert.*; import org.junit.Test; import org.junit.runner.RunWith; import org.powermock.api.mockito.PowerMockito; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; @RunWith(PowerMockRunner.class) @PrepareForTest(Employee.class) public class EmployeeServiceTest { @Test public void shouldReturnTheCountOfEmployeesUsingTheDomainClass() { PowerMockito.mockStatic(Employee.class); PowerMockito.when(Employee.count()).thenReturn(900); EmployeeService employeeService = new EmployeeService(); assertEquals(900, employeeService.getEmployeeCount()); } }
@RunWith(PowerMockRunner.class)语句告诉JUnit用PowerMockRunner来执行测试。
@PrepareForTest(Employee.class)语句告诉PowerMock准备Employee类进行测试。适用于模拟final类或有final, private, static, native
方法的类。
注意这里使用的是mockStatic而不是上面的mock。
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原文地址：http://www.cnblogs.com/pythontesting/p/4963813.html
