fun createAssertion(container: AssertionContainer<T>, descriptiveAssertion: Assertion, maybeAssertionCreator: Option<Expect<R>.() -> Unit>): Assertion
Overrides FailureHandler.createAssertion
Creates the failing assertion most likely based on the given descriptiveAssertion -- which in turn is based on the previously specified description, representation etc. -- and should incorporate the assertions maybeAssertionCreator would have created for the new subject as explanatory assertions.
Return
A failing assertion.