Mocking.java

class A
{
	B b;
	
	public B getB()
	{
		return b;
	}



	public setB(B b)
	{
		this.b=b;
	}

	public String  method(parameter)     //method of class A
	{
		String str = b.method2();
		return str;

	}

}

class YourTest
{
   public void testMethodShouldReturnExpectedString()
 {
     
     A a = new A();
     B b = mock(B.class);
     a.setB(b);
     a.method(parameter);
 }

}

When is instance of B created here ?