无法使用java类实例化名为exception的@InjectMocks字段
我有一个具有用户定义构造函数的类无法使用java类实例化名为exception的@InjectMocks字段,java,mockito,junit4,Java,Mockito,Junit4,我有一个具有用户定义构造函数的类 public class Employee { @Inject private MyBean myBean; private String abcd; protected Employee(Parameter1 param1, Parameter2 param2) { //some operations on method params //some operation on mybean
public class Employee
{
@Inject
private MyBean myBean;
private String abcd;
protected Employee(Parameter1 param1, Parameter2 param2)
{ //some operations on method params
//some operation on mybean
this.abcd = "some value";
}
protected String getAbcd()
{
return nrOfAccesses;
}
protected void setAbcd(String abcd)
{
this.abcd = abcd;
}
}
测试类
@RunWith(MockitoJUnitRunner.class)
public class TestEmployee
{
@Mock
private MyBean myBean;
private Parameter1 param1;
private Parameter2 param2;
@InjectMocks
private Employee employee;
@Before
public void prepare()
throws Exception
{
//some intialization
param1 = some value;
param2 = some value;
when(myBean.get(eq("ID"))).thenReturn("1075");
}
@Test
public void testEmployeeID()
{
employee = new Employee(param1, param2);
assertThat(employee.getAbcd(), is("XYZC"));
}
我也有例外
org.mockito.exceptions.base.MockitoException:
Cannot instantiate @InjectMocks field named 'employee' of type 'class com.xyz.Employee'.
You haven't provided the instance at field declaration so I tried to construct the instance.
However the constructor or the initialization block threw an exception : null
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl$1.withBefores(JUnit45AndHigherRunnerImpl.java:27)
at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:254)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.NullPointerException
如果执行
employee=新员工(param1,param2)
您也可以跳过@injectmock
它应该执行以下操作:
@InjectMocks
ClassUnderTest cut;
@Mock
Dependency1 dep1;
@Mock
Dependency2 dep2;
@Before
public void setup() {
initMocks(this);
}
省略@InjectMocks
可以使用以下代码实现相同的行为:
ClassUnderTest cut;
@Mock
Dependency1 dep1;
@Mock
Dependency2 dep2;
@Before
public void setup() {
initMocks(this);
cut = new ClassUnderTest(dep1, dep2);
}
在您的特定情况下,应该模拟
param1
和param2
。使用@InjectMocks
测试具有依赖项对象的服务类时,切勿手动调用构造函数,您可以执行以下操作:
@InjectMocks
ClassUnderTest cut;
@Mock
Dependency1 dep1;
@Mock
Dependency2 dep2;
@Before
public void setup() {
initMocks(this);
}
- 在测试类上放置@ExtendWith(SpringExtension.class)注释,而不是@ExtendWith(MockitoExtension.class)
- 将@SpringBootTest放在测试类上
- 将@Autowired注释放在任何依赖对象上,而不是放在@Mock上