[Test] Move KotlinAgainstKotlin tests under BlackBoxCodegen tests

compiler/testData/codegen/box/compileKotlinAgainstKotlin/sealedClass.kt

@@ -0,0 +1,40 @@
+// MODULE: lib
+// FILE: A.kt
+
+package a
+
+sealed class Empty
+
+sealed class OnlyNested {
+    class Nested : OnlyNested()
+}
+
+sealed class NestedAndTopLevel {
+    class Nested : NestedAndTopLevel()
+}
+class TopLevel : NestedAndTopLevel()
+
+// MODULE: main(lib)
+// FILE: B.kt
+
+import a.*
+
+// This test checks that we correctly load subclasses of a compiled sealed class from binaries.
+// It's not a diagnostic test because there are no diagnostic tests where resolution is performed against compiled Kotlin binaries
+
+fun empty(e: Empty): String = when (e) {
+    else -> "1"
+}
+
+fun onlyNested(on: OnlyNested): String = when (on) {
+    is OnlyNested.Nested -> "2"
+}
+
+fun nestedAndTopLevel(natl: NestedAndTopLevel): String = when (natl) {
+    is NestedAndTopLevel.Nested -> "3"
+    is TopLevel -> "4"
+}
+
+fun box(): String {
+    return "OK"
+}