[JS TESTS] Rewrite js tests using new test infrastructure

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/services/ModuleStructureExtractor.kt

@@ -17,4 +17,8 @@ abstract class ModuleStructureExtractor @OptIn(TestInfrastructureInternals::clas
         testDataFileName: String,
         directivesContainer: DirectivesContainer,
     ): TestModuleStructure
+
+    companion object {
+        const val DEFAULT_MODULE_NAME = "main"
+    }
 }

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/services/SourceFileProvider.kt

@@ -100,3 +100,6 @@ val TestFile.isKtsFile: Boolean
 
 val TestFile.isJavaFile: Boolean
     get() = name.endsWith(".java")
+
+val TestFile.isJsFile: Boolean
+    get() = name.endsWith(".js")