add webidl web-platform test suite

Author: anonrig

src/wpt/BUILD.bazel

@@ -146,6 +146,7 @@ wpt_test(
 
 wpt_test(
     name = "eventsource",
+    size = "large",
     config = "eventsource-test.ts",
     start_server = True,
     target_compatible_with = select({
@@ -156,3 +157,9 @@ wpt_test(
     }),
     wpt_directory = "@wpt//:eventsource@module",
 )
+
+wpt_test(
+    name = "webidl",
+    config = "webidl-test.ts",
+    wpt_directory = "@wpt//:webidl@module",
+)

src/wpt/webidl-test.ts

@@ -0,0 +1,98 @@
+// Copyright (c) 2017-2026 Cloudflare, Inc.
+// Licensed under the Apache 2.0 license found in the LICENSE file or at:
+//     https://opensource.org/licenses/Apache-2.0
+
+import { type TestRunnerConfig } from 'harness/harness';
+
+export default {
+  'ecmascript-binding/builtin-function-properties.any.js': {},
+  'ecmascript-binding/class-string-interface.any.js': {
+    comment: '@@toStringTag property descriptor mismatch',
+    expectedFailures: [
+      '@@toStringTag exists on the prototype with the appropriate descriptor',
+    ],
+  },
+  'ecmascript-binding/class-string-iterator-prototype-object.any.js': {
+    comment: 'Iterator @@toStringTag is different in workerd',
+    expectedFailures: [
+      '@@toStringTag exists with the appropriate descriptor',
+      'Object.prototype.toString',
+      'Object.prototype.toString applied to a null-prototype instance',
+    ],
+  },
+  'ecmascript-binding/class-string-named-properties-object.window.js': {
+    comment: 'Window-specific test',
+    omittedTests: true,
+  },
+  'ecmascript-binding/es-exceptions/DOMException-constants.any.js': {
+    comment: 'DOMException constants have wrong configurable descriptor',
+    expectedFailures: true,
+  },
+  'ecmascript-binding/es-exceptions/DOMException-constructor-and-prototype.any.js':
+    {
+      comment: 'DOMException property descriptors differ from spec',
+      expectedFailures: true,
+    },
+  'ecmascript-binding/es-exceptions/DOMException-constructor-behavior.any.js': {
+    comment: 'DOMException property inheritance differs from spec',
+    expectedFailures: true,
+  },
+  'ecmascript-binding/es-exceptions/DOMException-custom-bindings.any.js': {
+    comment: 'DOMException property descriptors differ from spec',
+    expectedFailures: true,
+  },
+  'ecmascript-binding/es-exceptions/DOMException-is-error.any.js': {
+    comment: 'DOMException.prototype not in Error.prototype chain',
+    expectedFailures: [''],
+  },
+  'ecmascript-binding/global-immutable-prototype.any.js': {
+    comment: 'globalThis prototype is unconfigurable in workerd',
+    expectedFailures: true,
+  },
+  'ecmascript-binding/global-mutable-prototype.any.js': {
+    comment: 'globalThis prototype is unconfigurable in workerd',
+    expectedFailures: true,
+  },
+  'ecmascript-binding/global-object-implicit-this-value.any.js': {
+    comment:
+      'Script fails to load - addEventListener is not defined in workerd',
+    expectedFailures: [
+      "Global object's getter throws when called on incompatible object",
+      "Global object's setter throws when called on incompatible object",
+      "Global object's operation throws when called on incompatible object",
+      "Global object's getter works when called on null / undefined",
+      "Global object's setter works when called on null / undefined",
+      "Global object's operation works when called on null / undefined",
+    ],
+  },
+  'ecmascript-binding/legacy-factor-function-subclass.window.js': {
+    comment: 'Window-specific test',
+    omittedTests: true,
+  },
+  'ecmascript-binding/legacy-factory-function-builtin-properties.window.js': {
+    comment: 'Window-specific test',
+    omittedTests: true,
+  },
+  'ecmascript-binding/legacy-platform-object/helper.js': {},
+  'ecmascript-binding/no-regexp-special-casing.any.js': {
+    comment: 'self.addEventListener is not available in workerd',
+    expectedFailures: [
+      'Conversion to a dictionary works',
+      'Conversion to a sequence works',
+      'Can be used as an object implementing a callback interface',
+    ],
+  },
+  'ecmascript-binding/observable-array-no-leak-of-internals.window.js': {
+    comment: 'Window-specific test',
+    omittedTests: true,
+  },
+  'ecmascript-binding/observable-array-ownkeys.window.js': {
+    comment: 'Window-specific test',
+    omittedTests: true,
+  },
+  'ecmascript-binding/support/create-realm.js': {},
+  'idlharness.any.js': {
+    comment: 'Missing /resources/WebIDLParser.js resource file',
+    omittedTests: true,
+  },
+} satisfies TestRunnerConfig;