fun <K, V : Any, T : Map<out K, V>> Assert<T>.getExisting(key: K): Assert<V>Makes the assertion that the Assert.subject contains the given key, creates a feature assertion plant for the corresponding value and returns the newly created plant.
AssertionError - Might throw an AssertionError if the given key does not exist.
Return
The newly created plant for the feature
fun <K, V : Any, T : Map<out K, V>> Assert<T>.getExisting(key: K, assertionCreator: Assert<V>.() -> Unit): AssertionPlant<T>Makes the assertion that the Assert.subject contains the given key and that the corresponding value holds all assertions the given assertionCreator might create for it.
AssertionError - Might throw an AssertionError if a created Assertions (by calling assertionCreator)
does not hold.
IllegalArgumentException - in case the given assertionCreator did not create a single assertion.
Return
This plant to support a fluent API.