mockito return value based on property of a parameter

Question

Normally when using mockito I will do something like

Mockito.when(myObject.myFunction(myParameter)).thenReturn(myResult);

Is it possible to do

Answer 1

You can do this with Mockito 3.6.0:

when(mockObject.myMethod(anyString()))
    .thenAnswer(invocation -> myStringMethod(invocation.getArgument(0)));

This answer is based on Sven's answer and Martijn Hiemstra's comment, with getArgumentAt() changed to getArgument().