fun createAndAddAssertionToPlant(subType: KClass<TSub>, subjectPlant: BaseAssertionPlant<T?, *>, failingAssertion: Assertion, assertionCreator: AssertionPlant<TSub>.() -> Unit): Unit
Wraps the assertions which might be created by assertionCreator into an ExplanatoryAssertionGroup and adds it to the given subjectPlant.
subType - The type to which the subjectPlant's subject should have been
down-casted.
subjectPlant - The plant to which additional assertions would have been added.
assertionCreator - The lambda which could have created subsequent assertions for the down-casted
AssertionPlant.subject.
AssertionError - Might throw an AssertionError depending on the subjectPlant.