Hi, when an assert on elements of large collections fails, it would be very helpful to only see "bad" items, not those that were expected. Currently, all elements in the collection are shown.

For instance, with containsExactly / contains.inOrder.only.entries, a section is dedicated to every single element, the encountered element is equal to the expected one or not. A correct element is annotated using a ✔️. A wrong element at the index, it is marked with an ✘.

When dealing with a large number of elements, it can be tedious to find the bad elements. The test author should be able to indicate which elements should be displayed, all elements or only the differences between good and bad elements.

This could be achieved using an optional boolean flag showAll, defaulting to true, or an optional displayFlags object or enumeration, for example. The option could be selected individually for every assertion or through a global property.

See also this discussion on Slack:
https://kotlinlang.slack.com/archives/C887ZKGCQ/p1578313112006400