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I thought assertFailsWith should fail when wrong exception is caught, but this seems to be successful:

val block: () -&gt; Unit = *{*
    “a string”._toInt_()
*}*

_assertFailsWith_&lt;IllegalArgumentException&gt;(block = block)

What am I missing?

`NumberFormatException` inherits from  `IllegalArgumentException`

<https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-number-format-exception/>

Which likely is why the test passes