[英]Spy an already initialized Java object Mockito
我正在使用Mocktio庫來編寫一些測試用例,因為我有一個精心設計的inhertance結構,我有一些在父類中實例化的對象,我想模擬它的一個函數調用。 Mockito庫是否提供了監視已初始化對象的任何方法?
此外,該對象不能直接實例化。
類似於以下 -
public class A {
protected static MyObject a;
public static void someMethod() {
a = myObjectBuilder.createObj();
}
}
而另一個B類看起來類似於
class B extends A {
@BeforeClass
public static void setUpBeforeClass() {
someMethod();
}
@Test
public void mockTest() {
// now mock behavior of some method of MyObject a
// Missing line to spy object a.
Mockito.doReturn(false).when(a).xyz();
/* Now call some method that triggers a.xyz()
again, it is not a direct call,
there are multiple layer of abstraction
*/
}
}
編輯:我嘗試了以下,但它不起作用
MyObject mock_object = Mockito.spy(a);
Mockito.doReturn(false).when(mock_object).xyz();
基本上,不要在BeforeClass中進行初始化,它只運行一次但是你需要在每次測試中都有新的間諜,或者你必須在每次測試之前“重新初始化”間諜對象。 請檢查此代碼:
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.mockito.Mockito;
import static org.assertj.core.api.Assertions.assertThat;
class MyObject{
public String cos;
public MyObject(String cos) {
this.cos = cos;
}
public boolean xyz() {
return true;
}
}
class A {
protected static MyObject a;
public void someMethod() {
a = new MyObject("cccc");
}
}
public class B extends A {
@Before
public void setUpBeforeTest() {
someMethod();
}
@Test
public void mockTest() {
MyObject mock_object = Mockito.spy(a);
Mockito.doReturn(false).when(mock_object).xyz();
assertThat(mock_object.xyz()).isFalse();
}
@Test
public void mockTest2() {
MyObject mock_object = Mockito.spy(a);
Mockito.doReturn(true).when(mock_object).xyz();
assertThat(mock_object.xyz()).isTrue();
}
}
如果您想按自己的方式使用,請更改:
public void someMethod() {
a = myObjectBuilder.createObj();
}
成:
public static void someMethod() {
a = myObjectBuilder.createObj();
}
您不能從靜態初始化器@BeforeClass調用非靜態方法:
class A {
protected static MyObject a;
public static void someMethod() {
a = new MyObject("cccc");
}
}
public class B extends A {
@BeforeClass
public static void setUpBeforeClass() {
someMethod();
}
@Test
public void mockTest() {
MyObject mock_object = Mockito.spy(a);
Mockito.doReturn(false).when(mock_object).xyz();
assertThat(mock_object.xyz()).isFalse();
}
@Test
public void mockTest2() {
MyObject mock_object = Mockito.spy(a);
// Here we replace original object with our spy
A.a = mock_object;
Mockito.doReturn(false).when(mock_object).xyz();
assertThat(a.xyz()).isFalse();
}
}
另一個例子(在這種情況下,我們用mock替換對象a (不需要spy):
class MyObject{
public String cos;
public MyObject(String cos) {
this.cos = cos;
}
public boolean xyz() {
return true;
}
}
class A {
protected MyObject a;
public A() {
a = new MyObject("ggggg");
}
public String doSomethingWithA(){
if(a.xyz()){
return a.cos;
}
else{
return "aaaa";
}
}
}
@RunWith(MockitoJUnitRunner.class)
public class B {
@Mock
MyObject mock_object;
@InjectMocks
A systemUnderTest = new A();
@Test
public void mockTest1() {
Mockito.doReturn(false).when(mock_object).xyz();
assertThat(systemUnderTest.doSomethingWithA()).isEqualTo("aaaa");
}
@Test
public void mockTest2() {
Mockito.doReturn(true).when(mock_object).xyz();
assertThat(systemUnderTest.doSomethingWithA()).isNull();
}
}
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