[Tests] Introduce runTest with transformer to old testing framework

js/js.tests/test/org/jetbrains/kotlin/js/testOld/BasicWasmBoxTest.kt

@@ -55,11 +55,12 @@ abstract class BasicWasmBoxTest(
         TODO("TestWithCoroutinesPackageReplacement are not supported")
     }
 
-    fun doTest(filePath: String) {
+    fun doTest(filePath: String) = doTestWithTransformer(filePath) { it }
+    fun doTestWithTransformer(filePath: String, transformer: java.util.function.Function<String, String>) {
         val file = File(filePath)
 
         val outputDir = getOutputDir(file)
-        val fileContent = KtTestUtil.doLoadFile(file)
+        val fileContent = transformer.apply(KtTestUtil.doLoadFile(file))
 
         TestFileFactoryImpl().use { testFactory ->
             val inputFiles: MutableList<TestFile> = TestFiles.createTestFiles(file.name, fileContent, testFactory, true)

js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenBoxWasmTestGenerated.java

@@ -12423,7 +12423,7 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
         }
 
         private void runTest(String testDataFilePath, java.util.function.Function<String, String> transformer) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.WASM, testDataFilePath, transformer);
+            KotlinTestUtils.runTest0(path -> doTestWithTransformer(path, transformer), TargetBackend.WASM, testDataFilePath);
         }
 
         public void testAllFilesPresentInInlineClasses() throws Exception {