how to mock class in java without creating interface
First, I am not Java developer, I am using php.
I am curious in Java, for example if I have structure like this:
interface Ainterface {
public String method();
}
public class A implements Ainterface {
public String method() {
//do something
}
}
public class B {
public String method(Ainterface a) {
a.method();
//do something
}
}
Now if I want to test B's method I can mock a
public class Amock implements Ainterface {
public String method() {
//do something
}
}
And inject it into B's method.
But, if I don't want to create interface and I have situation like this:
public class A {
public String method() {
//do something
}
}
public class B {
public String method(A a) {
a.method();
//do something
}
}
Is there any way to mock a or test B's method in other way?
java testing mocking
asked Nov 22 at 22:38
Nika Khurashvili
71712
add a comment |
First, I am not Java developer, I am using php.
I am curious in Java, for example if I have structure like this:
interface Ainterface {
public String method();
}
public class A implements Ainterface {
public String method() {
//do something
}
}
public class B {
public String method(Ainterface a) {
a.method();
//do something
}
}
Now if I want to test B's method I can mock a
public class Amock implements Ainterface {
public String method() {
//do something
}
}
And inject it into B's method.
But, if I don't want to create interface and I have situation like this:
public class A {
public String method() {
//do something
}
}
public class B {
public String method(A a) {
a.method();
//do something
}
}
Is there any way to mock a or test B's method in other way?
java testing mocking
asked Nov 22 at 22:38
Nika Khurashvili
71712
add a comment |
First, I am not Java developer, I am using php.
I am curious in Java, for example if I have structure like this:
interface Ainterface {
public String method();
}
public class A implements Ainterface {
public String method() {
//do something
}
}
public class B {
public String method(Ainterface a) {
a.method();
//do something
}
}
Now if I want to test B's method I can mock a
public class Amock implements Ainterface {
public String method() {
//do something
}
}
And inject it into B's method.
But, if I don't want to create interface and I have situation like this:
public class A {
public String method() {
//do something
}
}
public class B {
public String method(A a) {
a.method();
//do something
}
}
Is there any way to mock a or test B's method in other way?
java testing mocking
asked Nov 22 at 22:38
Nika Khurashvili
71712
First, I am not Java developer, I am using php.
I am curious in Java, for example if I have structure like this:
interface Ainterface {
public String method();
}
public class A implements Ainterface {
public String method() {
//do something
}
}
public class B {
public String method(Ainterface a) {
a.method();
//do something
}
}
Now if I want to test B's method I can mock a
public class Amock implements Ainterface {
public String method() {
//do something
}
}
And inject it into B's method.
But, if I don't want to create interface and I have situation like this:
public class A {
public String method() {
//do something
}
}
public class B {
public String method(A a) {
a.method();
//do something
}
}
Is there any way to mock a or test B's method in other way?
java testing mocking
java testing mocking
asked Nov 22 at 22:38
Nika Khurashvili
71712
asked Nov 22 at 22:38
Nika Khurashvili
71712
asked Nov 22 at 22:38
Nika Khurashvili
71712
asked Nov 22 at 22:38
Nika Khurashvili
71712
asked Nov 22 at 22:38
Nika Khurashvili
71712
71712
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
In Java you can use specific mocking framework like Mockito and use it's specific method - for example
A aMock = Mockito.mock(A.class);
Of course this way you can only create a really simple mock that will do literally nothing but the framework allows you to define what specific method should return with providing when/then mechanism. The example of such can be
when(aMock.method()).thenReturn("I am just a fake");
The mockito is really powerfull and I cannot explain you whole framework in this answer so please visit Mockito home and reference page to get familiar with this
Also Mockito is one of solutions - it's kind of popular but not only the one so you can look for the solution that fits your requirements best
answered Nov 22 at 22:40
m.antkowicz
8,542928
1
Thanks for answer, I get that, but if I don't want to use some framework is there any native way?
– Nika Khurashvili
Nov 22 at 22:45
1
nooooooooope :)
– m.antkowicz
Nov 22 at 22:47
Yes, but that would be reinventing the wheel, producing code to do something similar that mockito does. (Building your own mocking framework, for example with Proxies)
– Pascal Ludwig
Nov 22 at 23:17
Building your own mocking framework is not a native way
– m.antkowicz
Nov 23 at 7:37
add a comment |
@m.antkowicz's answer shows the correct way of doing it, by using a mocking framework. In the comments you asked for a way without using external framework, so this answer tries to address that.
Just like you created Amock by implementing Ainterface, you can create a child class that extends A.
So you would have a class like class AmockClassBased extends A and then you can override method() to make it do what you were doing in Amock class's method().
So your Amock will be changed to:-
public class AmockClassBased extends A {
@Override
public String method() {
//do something
}
}
Then you can pass an instance of this class to B's method(A a).
answered Nov 22 at 23:21
Kartik
2,51731331
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
In Java you can use specific mocking framework like Mockito and use it's specific method - for example
A aMock = Mockito.mock(A.class);
Of course this way you can only create a really simple mock that will do literally nothing but the framework allows you to define what specific method should return with providing when/then mechanism. The example of such can be
when(aMock.method()).thenReturn("I am just a fake");
The mockito is really powerfull and I cannot explain you whole framework in this answer so please visit Mockito home and reference page to get familiar with this
Also Mockito is one of solutions - it's kind of popular but not only the one so you can look for the solution that fits your requirements best
answered Nov 22 at 22:40
m.antkowicz
8,542928
1
Thanks for answer, I get that, but if I don't want to use some framework is there any native way?
– Nika Khurashvili
Nov 22 at 22:45
1
nooooooooope :)
– m.antkowicz
Nov 22 at 22:47
Yes, but that would be reinventing the wheel, producing code to do something similar that mockito does. (Building your own mocking framework, for example with Proxies)
– Pascal Ludwig
Nov 22 at 23:17
Building your own mocking framework is not a native way
– m.antkowicz
Nov 23 at 7:37
add a comment |
In Java you can use specific mocking framework like Mockito and use it's specific method - for example
A aMock = Mockito.mock(A.class);
Of course this way you can only create a really simple mock that will do literally nothing but the framework allows you to define what specific method should return with providing when/then mechanism. The example of such can be
when(aMock.method()).thenReturn("I am just a fake");
The mockito is really powerfull and I cannot explain you whole framework in this answer so please visit Mockito home and reference page to get familiar with this
Also Mockito is one of solutions - it's kind of popular but not only the one so you can look for the solution that fits your requirements best
answered Nov 22 at 22:40
m.antkowicz
8,542928
1
Thanks for answer, I get that, but if I don't want to use some framework is there any native way?
– Nika Khurashvili
Nov 22 at 22:45
1
nooooooooope :)
– m.antkowicz
Nov 22 at 22:47
Yes, but that would be reinventing the wheel, producing code to do something similar that mockito does. (Building your own mocking framework, for example with Proxies)
– Pascal Ludwig
Nov 22 at 23:17
Building your own mocking framework is not a native way
– m.antkowicz
Nov 23 at 7:37
add a comment |
In Java you can use specific mocking framework like Mockito and use it's specific method - for example
A aMock = Mockito.mock(A.class);
Of course this way you can only create a really simple mock that will do literally nothing but the framework allows you to define what specific method should return with providing when/then mechanism. The example of such can be
when(aMock.method()).thenReturn("I am just a fake");
The mockito is really powerfull and I cannot explain you whole framework in this answer so please visit Mockito home and reference page to get familiar with this
Also Mockito is one of solutions - it's kind of popular but not only the one so you can look for the solution that fits your requirements best
answered Nov 22 at 22:40
m.antkowicz
8,542928
In Java you can use specific mocking framework like Mockito and use it's specific method - for example
A aMock = Mockito.mock(A.class);
Of course this way you can only create a really simple mock that will do literally nothing but the framework allows you to define what specific method should return with providing when/then mechanism. The example of such can be
when(aMock.method()).thenReturn("I am just a fake");
The mockito is really powerfull and I cannot explain you whole framework in this answer so please visit Mockito home and reference page to get familiar with this
Also Mockito is one of solutions - it's kind of popular but not only the one so you can look for the solution that fits your requirements best
answered Nov 22 at 22:40
m.antkowicz
8,542928
edited Nov 22 at 22:48
answered Nov 22 at 22:40
m.antkowicz
8,542928
answered Nov 22 at 22:40
m.antkowicz
8,542928
answered Nov 22 at 22:40
m.antkowicz
8,542928
8,542928
1
Thanks for answer, I get that, but if I don't want to use some framework is there any native way?
– Nika Khurashvili
Nov 22 at 22:45
1
nooooooooope :)
– m.antkowicz
Nov 22 at 22:47
Yes, but that would be reinventing the wheel, producing code to do something similar that mockito does. (Building your own mocking framework, for example with Proxies)
– Pascal Ludwig
Nov 22 at 23:17
Building your own mocking framework is not a native way
– m.antkowicz
Nov 23 at 7:37
add a comment |
1
Thanks for answer, I get that, but if I don't want to use some framework is there any native way?
– Nika Khurashvili
Nov 22 at 22:45
1
nooooooooope :)
– m.antkowicz
Nov 22 at 22:47
Yes, but that would be reinventing the wheel, producing code to do something similar that mockito does. (Building your own mocking framework, for example with Proxies)
– Pascal Ludwig
Nov 22 at 23:17
Building your own mocking framework is not a native way
– m.antkowicz
Nov 23 at 7:37
1
1
Thanks for answer, I get that, but if I don't want to use some framework is there any native way?
– Nika Khurashvili
Nov 22 at 22:45
Thanks for answer, I get that, but if I don't want to use some framework is there any native way?
– Nika Khurashvili
Nov 22 at 22:45
1
1
nooooooooope :)
– m.antkowicz
Nov 22 at 22:47
nooooooooope :)
– m.antkowicz
Nov 22 at 22:47
Yes, but that would be reinventing the wheel, producing code to do something similar that mockito does. (Building your own mocking framework, for example with Proxies)
– Pascal Ludwig
Nov 22 at 23:17
Yes, but that would be reinventing the wheel, producing code to do something similar that mockito does. (Building your own mocking framework, for example with Proxies)
– Pascal Ludwig
Nov 22 at 23:17
Building your own mocking framework is not a native way
– m.antkowicz
Nov 23 at 7:37
Building your own mocking framework is not a native way
– m.antkowicz
Nov 23 at 7:37
add a comment |
@m.antkowicz's answer shows the correct way of doing it, by using a mocking framework. In the comments you asked for a way without using external framework, so this answer tries to address that.
Just like you created Amock by implementing Ainterface, you can create a child class that extends A.
So you would have a class like class AmockClassBased extends A and then you can override method() to make it do what you were doing in Amock class's method().
So your Amock will be changed to:-
public class AmockClassBased extends A {
@Override
public String method() {
//do something
}
}
Then you can pass an instance of this class to B's method(A a).
answered Nov 22 at 23:21
Kartik
2,51731331
add a comment |
@m.antkowicz's answer shows the correct way of doing it, by using a mocking framework. In the comments you asked for a way without using external framework, so this answer tries to address that.
Just like you created Amock by implementing Ainterface, you can create a child class that extends A.
So you would have a class like class AmockClassBased extends A and then you can override method() to make it do what you were doing in Amock class's method().
So your Amock will be changed to:-
public class AmockClassBased extends A {
@Override
public String method() {
//do something
}
}
Then you can pass an instance of this class to B's method(A a).
answered Nov 22 at 23:21
Kartik
2,51731331
add a comment |
@m.antkowicz's answer shows the correct way of doing it, by using a mocking framework. In the comments you asked for a way without using external framework, so this answer tries to address that.
Just like you created Amock by implementing Ainterface, you can create a child class that extends A.
So you would have a class like class AmockClassBased extends A and then you can override method() to make it do what you were doing in Amock class's method().
So your Amock will be changed to:-
public class AmockClassBased extends A {
@Override
public String method() {
//do something
}
}
Then you can pass an instance of this class to B's method(A a).
answered Nov 22 at 23:21
Kartik
2,51731331
@m.antkowicz's answer shows the correct way of doing it, by using a mocking framework. In the comments you asked for a way without using external framework, so this answer tries to address that.
Just like you created Amock by implementing Ainterface, you can create a child class that extends A.
So you would have a class like class AmockClassBased extends A and then you can override method() to make it do what you were doing in Amock class's method().
So your Amock will be changed to:-
public class AmockClassBased extends A {
@Override
public String method() {
//do something
}
}
Then you can pass an instance of this class to B's method(A a).
answered Nov 22 at 23:21
Kartik
2,51731331
answered Nov 22 at 23:21
Kartik
2,51731331
answered Nov 22 at 23:21
Kartik
2,51731331
answered Nov 22 at 23:21
Kartik
2,51731331
2,51731331
add a comment |
add a comment |
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