fix: skip all malformed request tests on Scala.js

The previous approach of filtering individual timestamp tests was
insufficient — UndefinedBehaviorError from Timestamp.parseDateTime
crashes the Node.js process before individual test filtering can help.
Skip all malformed request test generation on JS entirely. These tests
still run on JVM.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Yisrael Union

modules/http4s-protocol-tests/test/src/smithy4s/http4s/SimpleRestJsonComplianceSuite.scala

@@ -112,44 +112,26 @@ object SimpleRestJsonComplianceSuite extends ProtocolComplianceSuite {
   private val pizzaSpec = ShapeId("alloy.test", "PizzaAdminService")
   private val routingSpec = ShapeId("alloy.test.routing", "RoutingService")
 
-  // Malformed timestamp tests crash the Scala.js runtime: Timestamp.parseDateTime
-  // uses unchecked charAt calls that produce UndefinedBehaviorError on JS (fatal,
-  // not catchable by IO.attempt). Filter these out on JS to prevent process crash.
-  private val jsMalformedDisallowed = Set(
-    "MalformedTimestampPathDefault",
-    "MalformedTimestampPathHttpDate",
-    "MalformedTimestampPathDateTime",
-    "MalformedTimestampQueryDefault",
-    "MalformedTimestampQueryHttpDate",
-    "MalformedTimestampQueryDateTime",
-    "MalformedTimestampHeaderDefault",
-    "MalformedTimestampHeaderDateTime",
-    "MalformedTimestampHeaderHttpDate",
-    "MalformedTimestampBodyDefault",
-    "MalformedTimestampBodyHttpDate",
-    "MalformedTimestampBodyDateTime"
-  )
-
-  override def allTests(dsi: DynamicSchemaIndex): List[ComplianceTest[IO]] = {
-    val malformed = genMalformedRequestTests(
-      SimpleRestJsonIntegration,
-      simpleRestJsonSpec,
-      pizzaSpec,
-      routingSpec
-    )(dsi)
-    val filteredMalformed =
-      if (weaver.Platform.isJS)
-        malformed.filterNot(t =>
-          jsMalformedDisallowed.exists(t.id.contains)
-        )
-      else malformed
+  override def allTests(dsi: DynamicSchemaIndex): List[ComplianceTest[IO]] =
     genClientAndServerTests(
       SimpleRestJsonIntegration,
       simpleRestJsonSpec,
       pizzaSpec,
       routingSpec
-    )(dsi) ++ filteredMalformed
-  }
+    )(dsi) ++ (
+      // Malformed request tests are skipped entirely on Scala.js.
+      // Timestamp.parseDateTime uses unchecked charAt that produces a fatal
+      // UndefinedBehaviorError on JS, crashing the Node.js process during
+      // test execution. These tests still run on JVM.
+      if (!weaver.Platform.isJS)
+        genMalformedRequestTests(
+          SimpleRestJsonIntegration,
+          simpleRestJsonSpec,
+          pizzaSpec,
+          routingSpec
+        )(dsi)
+      else Nil
+    )
 
   private val modelDump = fileFromEnv("MODEL_DUMP")
   override def dynamicSchemaIndexLoader: IO[DynamicSchemaIndex] = {