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I'm trying to fix a JS lowering bug. How can I assert on the generated JS? I see there's CHECK_ comments which assert against function calls, but I want to check whether an `if`/`do`/`while` is present or a `for`

You can find existing directives <https://github.com/JetBrains/kotlin/blob/524c475834152112a3d32aba460f03e74c3d645a/js/js.tests/test/org/jetbrains/kotlin/js/testOld/utils/DirectiveTestUtils.java|here>.
If you miss something you can try to write another one, but before, it might worth sharing what are you trying to fix and how do you want to test it. cc <@U2T92KXP0> <@U02BK8ABTQF>

I'm looking at <https://youtrack.jetbrains.com/issue/KT-62652|https://youtrack.jetbrains.com/issue/KT-62652>

It also seems slightly broken for JVM, at least with steps <https://youtrack.jetbrains.com/issue/KT-59115|https://youtrack.jetbrains.com/issue/KT-59115>

I don't feel we have such comments, but you can easily define it in `DirectiveTestUtils`.
As a reference, you can check how `CHECK_COMMENT_EXISTS` is defined.