(kotlin related) with.is with default value instead of null

[mgenov]

Kotlin has semantic for nullable types which causes issues with using of with.is as it always returns null value and forces requirement for the param to be defined as nullable type.

Given the following method definition:

fun getTasks(employee: Employee): Tasks

When expection is set for the parameter:

oneOf(tasks).getTasks(with.`is`(anything<Employee>()))

Then test fails with:

java.lang.IllegalStateException: with.`is`(anything<Employee>()) must not be null

[racingDeveloper]

It looks like the problem is the return null in:
public <T> T with(Matcher<T> matcher) { addParameterMatcher(matcher); return null; }

What about returning a new Object?

[mgenov]

The result should be the generic type and It should throw typecast I suppose as you will have to return something like (T)Any().