POC for basic web platform test integration

Author: jasnell

Diff for: WORKSPACE

@@ -604,3 +604,14 @@ new_local_repository(
         visibility = ["//visibility:public"],)""",
     path = "empty",
 )
+
+# ========================================================================================
+# Web Platform Tests
+
+http_archive(
+    name = "wpt",
+    build_file = "//:build/BUILD.wpt",
+    integrity = "sha256-6mp9wOEkWuACXvSDmf1pL2Dlj5ruukYwQzwkNgcpCdI=",
+    strip_prefix = "wpt-merge_pr_47718",
+    url = "https://github.com/web-platform-tests/wpt/archive/refs/tags/merge_pr_47718.tar.gz",
+)

Diff for: build/BUILD.wpt

@@ -0,0 +1,8 @@
+filegroup(
+    name = "url",
+    srcs = glob(
+        include = ["url/**/*"],
+        allow_empty = True,
+    ),
+    visibility = ["//visibility:public"],
+)

Diff for: src/workerd/api/wpt/BUILD.bazel

@@ -0,0 +1,12 @@
+load("//:build/wd_test.bzl", "wd_test")
+
+wd_test(
+    name = "url-test",
+    src = "url-test.wd-test",
+    args = ["--experimental"],
+    data = [
+        "url-test.js",
+        "//src/wpt:wpt-test-harness",
+        "@wpt//:url",
+    ],
+)

Diff for: src/workerd/api/wpt/url-test.js

@@ -0,0 +1,23 @@
+import { strictEqual } from 'assert';
+
+// The harness has no exports of it's own but does modify the global
+// scope to include the additional stuff the Web Platform Tests expect.
+import * as harness from 'harness';
+
+export const test = {
+  async test() {
+    // The tests will be run when the module is imported. Note that
+    // there are limitations to this in that the module is not allowed
+    // to perform any I/O... so any test that requires setTimeout,
+    // for instance, will fail... this also means we cannot run
+    // fetch tests from WPT... sad face.
+    const foo = await import('url-origin.any.js');
+
+    if (globalThis.errors.length > 0) {
+      for (const err of globalThis.errors) {
+        console.error(err);
+      }
+      throw new Error('Test failed');
+    }
+  },
+};

Diff for: src/workerd/api/wpt/url-test.wd-test

@@ -0,0 +1,30 @@
+using Workerd = import "/workerd/workerd.capnp";
+
+const unitTests :Workerd.Config = (
+  services = [
+    ( name = "url-test-test",
+      worker = (
+        modules = [
+          (name = "worker", esModule = embed "url-test.js"),
+          (name = "harness",
+           esModule = embed "../../../../../workerd/src/wpt/harness.js"),
+          (name = "url-origin.any.js",
+           esModule = embed "../../../../../wpt/url/url-origin.any.js"),
+          (name = "resources/urltestdata.json",
+           json = embed "../../../../../wpt/url/resources/urltestdata.json"),
+          (name = "resources/urltestdata-javascript-only.json",
+           json = embed "../../../../../wpt/url/resources/urltestdata-javascript-only.json"),
+        ],
+        bindings = [
+          (name = "wpt", service = "wpt"),
+        ],
+        compatibilityDate = "2024-07-01",
+        compatibilityFlags = ["nodejs_compat_v2"],
+      )
+    ),
+    (
+      name = "wpt",
+      disk = ".",
+    )
+  ],
+);

Diff for: src/wpt/BUILD.bazel

@@ -0,0 +1,8 @@
+filegroup(
+    name = "wpt-test-harness",
+    srcs = glob(
+        include = ["**/*"],
+        allow_empty = True,
+    ),
+    visibility = ["//visibility:public"],
+)

Diff for: src/wpt/harness.js

@@ -0,0 +1,29 @@
+import { strictEqual } from 'node:assert';
+
+globalThis.fetch = async (url) => {
+  const { default: data } = await import(url);
+  return {
+    async json() {
+      return data;
+    },
+  };
+};
+
+globalThis.promise_test = (callback) => {
+  callback();
+};
+
+globalThis.assert_equals = (a, b, c) => {
+  strictEqual(a, b, c);
+};
+
+globalThis.test = (callback, message) => {
+  try {
+    callback();
+  } catch (err) {
+    const aerr = new AggregateError([err], message);
+    globalThis.errors.push(aerr);
+  }
+};
+
+globalThis.errors = [];