java.lang.IllegalArgumentException: Could not find the specified Constructor: genmocks.***.***.***DelegateSubclass([])

[Billybear]

Hi,When I use the AndroidMock,I got this error.
The class I want to mock is like this below:
public B extends A{
public B(Context ctx){
super(ctx);
}
other functions....
}
public A {
protected final Context context;

public A(Context ctx){
this.context = ctx;
}
}

when I want to Mock the class B ,I got the above error.
Is it because that the Variable ‘context’ is final and it needs the
Constructor to initializ？

thank you for you reply.

[Andrey Fedorov]

Hello.

It seems you are trying to create mock using parameterless constructor.

You have to specify papameter. In this case AndroidMock search for parametised constructor.
Try this:

B b = AndroidMock.CreateMock(B.class, ctx);

the ctx variable is a variable of type Context and is not null.

[Billybear]

Thank you very much ! I have resolved the problem.
There is another problem,I don't know whether the object can be
mocked.
for example:
Class A{
private B b;
public int fun1(){
return b.fun2();
}
}

Class B{
public int fun2(){
return 100;
}
}
I want to test the function fun1() in class A.And there is a 'b' in
the function and it's type is "B".
So My idea is that I mock a object of B,and set the expected value of
fun2 in "B",and then set the b in A with the mocked object,But the b
in A is private.
Is there a solution? Thanks~

[Andrey Fedorov]

Hello.

You have to use a dependency injection framework.
I use the RoboGuice one.

But beware to put mocked instances into injection container. The dalvik crashes this case.
I had written about this here:
https://groups.google.com/forum/#!searchin/roboguice/androidmock/roboguice/2t08KAbI_Ok/4booEhqvm60J
but I still have not got any solution. I've found how to avoid this problem, but it requres to create an intermediate mocable class and injection provider.

I can write it more granulary if you want to use RoboGiuce

[Stephen Woodward]

As an alternative you could do some manual dependency injection by:

1) create a constructor for A that takes parameter B
2) in your test create mock B and use it when instantiating A

You may find this easier than adding new framework components (eg RoboGuice) if you only have a few classes that match your A B example.

Steve