How to call mock method instead of real method in mockito/Junit - unit-testing

Question

I want to call ClassA.mockMethod() whenever objOfClassB.realMethod() method is invoked.
public class ClassA{
public static int mockMethod(String url, MySql sql){
int res=0
// do work
return ;
}
}
Definition of executeUpdate1()
class Veps{
protected synchronized int realMethod(String url, MySql sql){
----
-----
}
}
public class VepsTest {
public void setUp() throws Exception {
veps = mock(Veps.class);
when(objOfClassA.realMethod(any(String.class), any())).thenReturn(objOfClassB.mockMethod(any(String.class),any()));
}
}
org.mockito.exceptions.misusing.InvalidUseOfMatchersException:
Invalid use of argument matchers!
2 matchers expected, 4 recorded.
This exception may occur if matchers are combined with raw values:
//incorrect:
someMethod(anyObject(), "raw String");
When using matchers, all arguments have to be provided by matchers.
For example:
//correct:
someMethod(anyObject(), eq("String by matcher"));

Answer 1

the mockito reports the errors clearly:
Invalid use of argument matchers! 2 matchers expected, 4 recorded.
you shouldn't using Matchers in any then* clause. your problem can be fixed as:
when(veps.executeQuery1(any(String.class), any(MySql.class)))
.thenReturn(DBConnection.mockExecuteQuery("??","??"));
when(veps.executeUpdate1(any(String.class), any()))
.thenReturn(DBConnection.mockExecuteUpdate("??","??"));
but another problem appears: why did you need query the result from the database? you can simply take a constant value to fake the result:
when(veps.executeQuery1(any(String.class), any(MySql.class)))
.thenReturn(1);
// ^--- replace the constant 1 with yours
when(veps.executeUpdate1(any(String.class), any()))
.thenReturn(1);
// ^--- replace the constant 1 with yours
you need to see mockito documentation as further before using it in your test.