I have a class that calls method from another class to get the report status.
Class A {
private classb b = new classb();
method x() {
String xyz =b.method1( parm1, parm2)
}
}
So, when for Junit test for method x getting null pointer on b.method(). I have created mock for class b and did following
Mockito.doReturn(val).when(classbMock).method1(parm1,parm2);
Please help how can I mock the class b and get pass it.
Thanks
In order to mock b you'll need to give it to the instance of class A.
There's at least several ways of doing this:
A a constructor that allows you to inject the dependency into AA.x and assume that b works (because that has it's own unit test)I'd prefer option 3 (assuming that A is a dependent of the thing under test and not the thing being tested). For a unit test I only want to mock the immediate dependencies, not all of the transient dependencies.
Instead of ClassA instantiating it's own instance of ClassB, pass the instance of B in via A's constructor (or a setter):
public class ClassA {
public ClassA(ClassB b) {
this.b = b;
}
public void x() {
String blah = b.method1(parm1, parm2);
}
}
Then in your test, you can pass the mock version of B to the instance of A being tested:
ClassB classBMock = mock(ClassB.class);
ClassA a = new ClassA(classBMock);
And your real code can pass in the non-mock version of ClassB to A.
