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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?
我想模擬一個對象及其自動裝配的構造函數依賴項之一。
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; }
}
當在MyTest::myTest
調用a::some
時,這將引發NPE。 如何模擬模擬依賴項?
首先,您必須選擇跑步者
SpringRunner或Mockito Runner
在這種情況下,我選擇了SpringRunner:Docs: https ://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/test/context/junit4/SpringRunner.html
然后創建一個A的MockBean,並且必須定義模擬行為
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測試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; }
}
}
監視A並嘲笑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; }
}
}
結果 :斷言失敗,因為B的模擬行為為假。
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