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[英]How to create a mock spring bean for a class having autowired dependencies
[英]How to mock a spring bean and also its autowired ctor arguments?
我想模拟一个对象及其自动装配的构造函数依赖项之一。
例如:
class MyTest {
@MockBean A a;
@Test myTest() {
assertTrue(when(a.some()).thenCallRealMethod());
}
}
@Component
class A {
private B b;
A(B dependency) {
this.b = dependency;
}
boolean some() {
return b.value();
}
}
@Configuration
class B {
boolean value() { return true; }
}
当在MyTest::myTest
调用a::some
时,这将引发NPE。 如何模拟模拟依赖项?
首先,您必须选择跑步者
SpringRunner或Mockito Runner
在这种情况下,我选择了SpringRunner:Docs: https ://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/test/context/junit4/SpringRunner.html
然后创建一个A的MockBean,并且必须定义模拟行为
when(a.some()).thenReturn(true);
@RunWith(SpringRunner.class)
public class MyTest {
@MockBean A a;
@Test
public void myTest() {
when(a.some()).thenReturn(true);
assertTrue(a.some());
}
@Component
class A {
private B b;
A(B dependency) {
this.b = dependency;
}
boolean some() {
return b.value();
}
}
@Configuration
class B {
boolean value() { return true; }
}
}
使用@SpyBean测试Real方法:
@RunWith(SpringRunner.class)
@SpringBootTest(classes={MyTest.class,MyTest.B.class,MyTest.A.class})
public class MyTest {
@SpyBean A a;
@Test
public void myTest() {
assertTrue(a.some());
}
@Component
class A {
private B b;
A(B dependency) {
this.b = dependency;
}
boolean some() {
return b.value();
}
}
@Configuration
class B {
boolean value() { return true; }
}
}
监视A并嘲笑B如下所示:
@RunWith(SpringRunner.class)
@SpringBootTest(classes={MyTest.class,MyTest.B.class,MyTest.A.class})
public class MyTest {
@SpyBean A a;
@MockBean B b;
@Test
public void myTest() {
when(b.value()).thenReturn(false);
assertTrue(a.some());
}
@Component
class A {
private B b;
A(B dependency) {
this.b = dependency;
}
boolean some() {
return b.value();
}
}
@Configuration
class B {
boolean value() { return true; }
}
}
结果 :断言失败,因为B的模拟行为为假。
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