tests: Update external tests (1.1.2-dev-393)

backend.native/tests/external/codegen/box/casts/lambdaToUnitCast.kt

@@ -0,0 +1,9 @@
+// IGNORE_BACKEND: JS
+// JS backend does not support Unit well. See KT-13932
+
+val foo: () -> Unit = {}
+
+fun box(): String {
+    foo() as Unit
+    return "OK"
+}