我用Java编写了2个类。它们是Developer
和GroupManager
。开发人员的字段private GroupManager supervisor
(带有getter和setter)描述了谁雇用他。而且,GroupManager
具有以下方法:
public class GroupManager {
//...
private List<Developer> employees;
public void hire(Developer e) {
if(canHire()) {
if(employees.contains(e)) {
System.out.println(e.getName() + " is already hired");
}
else {
e.setSupervisor(this);
employees.add(e);
System.out.println(getName() + " is now hiring " + e.getName());
}
}
else {
System.out.println(getName() + "cannot hire more employees.");
}
}
}
此类公开方法
hire
,该方法在给定的开发人员上设置主管。我想为类
Developer
编写测试。我这样做是这样的:
@Test
public void hiringWorksAsItShould() throws Exception {
GroupManager gm = new GroupManager("John Doe", "manager", 1);
gm.hire(developer);
assertThat(developer.getSupervisor()).isInstanceOf(GroupManager.class);
}
我正在使用FEST测试框架,但是由于它非常直观,所以我相信每个人都可以理解它的含义。该测试通过了,但是因为我希望它成为单元测试,所以决定用
= new GroupManager
替换= mock(GroupManager.class)
。问题是现在该测试失败了。我如何更正此Mockito功能以检查开发人员的主管是GroupManager
的实例。编辑
我得到的错误:
java.lang.AssertionError: expecting actual value not to be null
at org.fest.assertions.Fail.failure(Fail.java:228)
at org.fest.assertions.Fail.fail(Fail.java:167)
at org.fest.assertions.Fail.failIfActualIsNull(Fail.java:100)
at org.fest.assertions.GenericAssert.isNotNull(GenericAssert.java:238)
at org.fest.assertions.ObjectAssert.isInstanceOf(ObjectAssert.java:52)
at DeveloperTest.hiringWorksAsItShould(DeveloperTest.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
开发人员类:
public class Developer {
private final String name;
private String role;
private Manager supervisor;
public Manager getSupervisor() {
return supervisor;
}
public void setSupervisor(Manager supervisor) {
this.supervisor = supervisor;
}
}
DeveloperTest类:
import org.junit.Test;
import static org.fest.assertions.Assertions.*;
import static org.mockito.Mockito.mock;
public class DeveloperTest {
static final Developer developer = new Developer("John Doe", "developer");
@Test
public void hiringWorksAsItShould() throws Exception {
GroupManager gm = mock(GroupManager.class);
gm.hire(developer);
assertThat(developer.getSupervisor()).isInstanceOf(GroupManager.class);
}
提前致谢。
最佳答案
您确定要用模拟而不是员工替换GroupManager吗?
如果你有...
@Test
public void hiringWorksAsItShould() throws Exception {
GroupManager gm = mock(GroupManager.class);
gm.hire(developer); // YOU ARE CALLING THE MOCK HERE THEN!!
assertThat(developer.getSupervisor()).isInstanceOf(GroupManager.class);
}
您不是要这样吗?
@Test
public void hiringWorksAsItShould() throws Exception {
// CLASS UNDER TEST \/
GroupManager gm = new GroupManager("John Doe", "manager", 1);
// Mock "developer"...
Developer developer = mock(Developer.class);
gm.hire(developer);
verify(developer).setSupervisor(gm);
}
因此,当您测试GroupManager时,这应该是一个可靠的实现,并且应该模仿与之交互的事物(即Developer)。