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Mocking new instance creation inside testing class using mockito

Efficiency of Java “Double Brace Initialization”?How to make mock to void methods with MockitoInjecting Mockito mocks into a Spring beanHow to mock an exception when creating an instance of a new class using MockitoMocking static methods with PowerMock and MockitoNeed to mock creation of a object inside a constructor of the class to be testedMockito: inject a class mock into a private interface fieldMocking constructor and static method from same class with Mockito and PowermockMock final class with Mockito 2Mockito cannot mock this class: interface

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0

I am attempting to mock the new instance of an object inside the class I'm testing but I'm struggling to find a way to do this using Mockito.

If I understand this correctly, this might be something that can be achieved using Powermock but I only have Mockito at my disposal I can use.

Here's what I'm trying to do

 private class MyTestClass
 private doSomethingMethod()
 Object obj = new Object();
 obj.getSomething;
 
 

I am currently spying on MyTest class and would like to mock the new Object so that I can manipulate the result of obj.getSomething()

Is this something achievable using Mockito?
Thank you

java initialization mockito spy

share|improve this question

asked Mar 25 at 0:21

SgrSgr

268

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unfortunately, Powermock(ito) is one answer. Mockito doesn't intercept object instantiation :( ** Edit - unless you move the object instantiation to a new package-visible method and then mock the response to that method in your spy. But then your code is written at the whim of your tests.
  
  – Not a JD
  Mar 25 at 0:47
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Without PowerMock you will need to refactor your code to make the instance available for mocking, for example, moving your object creation to a factory or a provider method, and then mock the method/factory return accodingly
  
  – nullptr
  Mar 25 at 1:12
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Check this out. But, as pointed out in the earlier comments, refactoring is required for sure. (though it is easy in PowerMock)
  
  – Aditya Bhardwaj
  Mar 25 at 7:26
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you guys, that's what I was afraid of, sadly refactoring is limited as this is legacy code and I'm trying to achieve some test coverage with minimal refactoring. Powermock seems like the only option. I'm just wondering, so far I'm using mockito, if I add powermock, will it start conflicting with my mockito tests?
  
  – Sgr
  Mar 25 at 8:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Sgr No it won't. We use Powermock along with Mockito and there are no conflicts.
  
  – Aditya Bhardwaj
  Mar 25 at 9:31
  

  
  
  
  

 | 
show 1 more comment

0

I am attempting to mock the new instance of an object inside the class I'm testing but I'm struggling to find a way to do this using Mockito.

If I understand this correctly, this might be something that can be achieved using Powermock but I only have Mockito at my disposal I can use.

Here's what I'm trying to do

 private class MyTestClass
 private doSomethingMethod()
 Object obj = new Object();
 obj.getSomething;
 
 

I am currently spying on MyTest class and would like to mock the new Object so that I can manipulate the result of obj.getSomething()

Is this something achievable using Mockito?
Thank you

java initialization mockito spy

share|improve this question

asked Mar 25 at 0:21

SgrSgr

268

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unfortunately, Powermock(ito) is one answer. Mockito doesn't intercept object instantiation :( ** Edit - unless you move the object instantiation to a new package-visible method and then mock the response to that method in your spy. But then your code is written at the whim of your tests.
  
  – Not a JD
  Mar 25 at 0:47
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Without PowerMock you will need to refactor your code to make the instance available for mocking, for example, moving your object creation to a factory or a provider method, and then mock the method/factory return accodingly
  
  – nullptr
  Mar 25 at 1:12
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Check this out. But, as pointed out in the earlier comments, refactoring is required for sure. (though it is easy in PowerMock)
  
  – Aditya Bhardwaj
  Mar 25 at 7:26
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you guys, that's what I was afraid of, sadly refactoring is limited as this is legacy code and I'm trying to achieve some test coverage with minimal refactoring. Powermock seems like the only option. I'm just wondering, so far I'm using mockito, if I add powermock, will it start conflicting with my mockito tests?
  
  – Sgr
  Mar 25 at 8:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Sgr No it won't. We use Powermock along with Mockito and there are no conflicts.
  
  – Aditya Bhardwaj
  Mar 25 at 9:31
  

  
  
  
  

 | 
show 1 more comment

I am attempting to mock the new instance of an object inside the class I'm testing but I'm struggling to find a way to do this using Mockito.

If I understand this correctly, this might be something that can be achieved using Powermock but I only have Mockito at my disposal I can use.

Here's what I'm trying to do

 private class MyTestClass
 private doSomethingMethod()
 Object obj = new Object();
 obj.getSomething;
 
 

I am currently spying on MyTest class and would like to mock the new Object so that I can manipulate the result of obj.getSomething()

Is this something achievable using Mockito?
Thank you

java initialization mockito spy

share|improve this question

asked Mar 25 at 0:21

SgrSgr

268

 private class MyTestClass
 private doSomethingMethod()
 Object obj = new Object();
 obj.getSomething;
 
 

share|improve this question

asked Mar 25 at 0:21

SgrSgr

268

share|improve this question

asked Mar 25 at 0:21

SgrSgr

268

asked Mar 25 at 0:21

SgrSgr

268

asked Mar 25 at 0:21

SgrSgr

268

1 Answer
1

active

oldest

votes

0

IMHO everything is better in your case than using Powermock, as you already stated.

In similar cases I am using a solution which puts the "unmockable" code in an as-small-as-possible method and @Spy around like:

public class SpyTest 
 @Spy
 private MyTestClass myTestClass;

 @Before
 public void initMocks() 
 MockitoAnnotations.initMocks(this);
 

 @Test
 public void spyInsteadOfPowermock() 
 when(myTestClass.getObject()).thenReturn(Integer.valueOf(3));

 assertThat(myTestClass.doSomethingMethod()).isEqualTo("3");
 

 class MyTestClass
 public String doSomethingMethod()
 return getObject().toString();
 

 Object getObject() 
 return new Object();
 
 

share|improve this answer

answered Mar 25 at 14:17

mlemle

1,4911320

add a comment | 

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0

IMHO everything is better in your case than using Powermock, as you already stated.

In similar cases I am using a solution which puts the "unmockable" code in an as-small-as-possible method and @Spy around like:

public class SpyTest 
 @Spy
 private MyTestClass myTestClass;

 @Before
 public void initMocks() 
 MockitoAnnotations.initMocks(this);
 

 @Test
 public void spyInsteadOfPowermock() 
 when(myTestClass.getObject()).thenReturn(Integer.valueOf(3));

 assertThat(myTestClass.doSomethingMethod()).isEqualTo("3");
 

 class MyTestClass
 public String doSomethingMethod()
 return getObject().toString();
 

 Object getObject() 
 return new Object();
 
 

share|improve this answer

answered Mar 25 at 14:17

mlemle

1,4911320

add a comment | 

0

IMHO everything is better in your case than using Powermock, as you already stated.

In similar cases I am using a solution which puts the "unmockable" code in an as-small-as-possible method and @Spy around like:

public class SpyTest 
 @Spy
 private MyTestClass myTestClass;

 @Before
 public void initMocks() 
 MockitoAnnotations.initMocks(this);
 

 @Test
 public void spyInsteadOfPowermock() 
 when(myTestClass.getObject()).thenReturn(Integer.valueOf(3));

 assertThat(myTestClass.doSomethingMethod()).isEqualTo("3");
 

 class MyTestClass
 public String doSomethingMethod()
 return getObject().toString();
 

 Object getObject() 
 return new Object();
 
 

share|improve this answer

answered Mar 25 at 14:17

mlemle

1,4911320

add a comment | 

IMHO everything is better in your case than using Powermock, as you already stated.

In similar cases I am using a solution which puts the "unmockable" code in an as-small-as-possible method and @Spy around like:

public class SpyTest 
 @Spy
 private MyTestClass myTestClass;

 @Before
 public void initMocks() 
 MockitoAnnotations.initMocks(this);
 

 @Test
 public void spyInsteadOfPowermock() 
 when(myTestClass.getObject()).thenReturn(Integer.valueOf(3));

 assertThat(myTestClass.doSomethingMethod()).isEqualTo("3");
 

 class MyTestClass
 public String doSomethingMethod()
 return getObject().toString();
 

 Object getObject() 
 return new Object();
 
 

share|improve this answer

answered Mar 25 at 14:17

mlemle

1,4911320

public class SpyTest 
 @Spy
 private MyTestClass myTestClass;

 @Before
 public void initMocks() 
 MockitoAnnotations.initMocks(this);
 

 @Test
 public void spyInsteadOfPowermock() 
 when(myTestClass.getObject()).thenReturn(Integer.valueOf(3));

 assertThat(myTestClass.doSomethingMethod()).isEqualTo("3");
 

 class MyTestClass
 public String doSomethingMethod()
 return getObject().toString();
 

 Object getObject() 
 return new Object();
 
 

share|improve this answer

answered Mar 25 at 14:17

mlemle

1,4911320

answered Mar 25 at 14:17

mlemle

1,4911320

answered Mar 25 at 14:17

mlemle

1,4911320