我想模拟一个对象及其自动连接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; }
}
这将在MyTest::myTest
中调用a::some
时抛出 NPE。 如何模拟模拟依赖项?
首先,你必须选择跑步者,
SpringRunner 或 Mockito Runner
在这种情况下,我选择了SpringRunner: 文档 : https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/test/context/junit4/SpringRunner.html
然后你创建了一个 A 的模拟豆,你必须定义模拟行为
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:断言失败作为 B 的模拟行为是错误的。