fun <T : Any, B : Contains.Builder<T, *>> Contains.CheckerOption<T, *, *, B>.addAssertionForAssert(assertion: Assertion): Assert<T>fun <E, T : Iterable<E>, S : IterableContains.SearchBehaviour> IterableContains.Builder<E, T, S>.addAssertionForAssert(assertion: Assertion): Assert<T>Helper method which simplifies adding assertions to the assertion container which itself is stored in Contains.CheckerOption.containsBuilder.
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The plant to support a fluent API.