[K/JS] Rework kotlin tests compilation to make it works with per-file granularity ^KT-61525 Fixed

js/js.translator/testData/box/esModules/kotlin.test/mpp.kt

@@ -0,0 +1,32 @@
+// EXPECTED_REACHABLE_NODES: 1697
+// !LANGUAGE: +MultiPlatformProjects
+// TARGET_FRONTEND: ClassicFrontend
+// FIR status: expect/actual in one module
+// KJS_WITH_FULL_RUNTIME
+// SKIP_DCE_DRIVEN
+// RUN_UNIT_TESTS
+// ES_MODULES
+
+// FILE: lib.kt
+import kotlin.test.Test
+
+expect class PlatformTest {
+    @Test fun platformTest()
+}
+
+// FILE: main.kt
+import common.*
+import kotlin.test.Test
+
+actual class PlatformTest {
+    @Test actual fun platformTest() {}
+
+    @Test fun someOtherTest() {}
+}
+
+fun box() = checkLog {
+    suite("PlatformTest") {
+        test("platformTest")
+        test("someOtherTest")
+    }
+}