In Kotlin how do you test equivalence between two Lists? i.e content is the same but not necessarily the same order?

If order is not important then what you describe is Set equivalence.

list1.toSet() == list2.toSet()

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Thank you!

Another consideration being

listOf("a","a").size == setOf("a", "a").size // is false

Using a set and size would still fail for listOf("a", "a", "b") vs listOf("a", "b", "b")

If sort is to slow, you can make a hashmap with item counts