automatically create wd-test files

WORKSPACE

@@ -611,7 +611,7 @@ new_local_repository(
 http_archive(
     name = "wpt",
     build_file = "//:build/BUILD.wpt",
-    integrity = "sha256-6mp9wOEkWuACXvSDmf1pL2Dlj5ruukYwQzwkNgcpCdI=",
+    integrity = "sha256-pJPjzEf1mkkyljFnePpT9MRV1jcfRJg3k9a45CEGxuo=",
     strip_prefix = "wpt-merge_pr_47718",
     url = "https://github.com/web-platform-tests/wpt/archive/refs/tags/merge_pr_47718.tar.gz",
 )

src/workerd/api/wpt/BUILD.bazel

@@ -1,12 +1,4 @@
 load("//:build/wd_test.bzl", "wd_test")
+load("//src/workerd/api/wpt:generate-tests.bzl", "gen_wpt_tests")
 
-wd_test(
-    name = "url-test",
-    src = "url-test.wd-test",
-    args = ["--experimental"],
-    data = [
-        "url-test.js",
-        "//src/wpt:wpt-test-harness",
-        "@wpt//:url",
-    ],
-)
+gen_wpt_tests(glob(["**/*.js"]))

src/workerd/api/wpt/generate-tests.bzl

@@ -0,0 +1,62 @@
+load("@bazel_skylib//rules:write_file.bzl", "write_file")
+load("//:build/wd_test.bzl", "wd_test")
+
+# 0 - name of the service
+# 1 - es module file path (ex: url-test for url-test.js)
+WPT_TEST_TEMPLATE = """
+using Workerd = import "/workerd/workerd.capnp";
+
+const unitTests :Workerd.Config = (
+  services = [
+    ( name = "{}",
+      worker = (
+        modules = [
+          (name = "worker", esModule = embed "{}.js"),
+          (name = "harness",
+           esModule = embed "../../../../../workerd/src/wpt/harness.js"),
+          (name = "url-origin.any.js",
+           esModule = embed "../../../../../wpt/url/url-origin.any.js"),
+          (name = "url-constructor.any.js",
+           esModule = embed "../../../../../wpt/url/url-constructor.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 = ".",
+    )
+  ],
+);"""
+
+# Example: generate_wd_test_file("url-test")
+def generate_wd_test_file(name):
+    return WPT_TEST_TEMPLATE.format(name, name)
+
+def gen_wpt_tests(files):
+    for file in files:
+        name = file.removesuffix(".js")
+        src = "{}.wd-test".format(name)
+        write_file(
+            name = name + "@rule",
+            out = src,
+            content = [generate_wd_test_file(name)],
+        )
+        wd_test(
+            name = name,
+            src = src,
+            args = ["--experimental"],
+            data = [
+                file,
+                "//src/wpt:wpt-test-harness",
+                "@wpt//:url",
+            ],
+        )

src/workerd/api/wpt/url-test.js

@@ -1,23 +1,17 @@
-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 = {
+export const urlConstructor = {
   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');
+    harness.prepare();
+    await import('url-constructor.any.js');
+    harness.validate();
+  },
+};
 
-    if (globalThis.errors.length > 0) {
-      for (const err of globalThis.errors) {
-        console.error(err);
-      }
-      throw new Error('Test failed');
-    }
+export const urlOrigin = {
+  async test() {
+    harness.prepare();
+    await import('url-origin.any.js');
+    harness.validate();
   },
 };

src/wpt/harness.js

@@ -21,9 +21,21 @@ globalThis.test = (callback, message) => {
   try {
     callback();
   } catch (err) {
-    const aerr = new AggregateError([err], message);
-    globalThis.errors.push(aerr);
+    globalThis.errors.push(new AggregateError([err], message));
   }
 };
 
 globalThis.errors = [];
+
+export function prepare() {
+  globalThis.errors = [];
+}
+
+export function validate() {
+  if (globalThis.errors.length > 0) {
+    for (const err of globalThis.errors) {
+      console.error(err);
+    }
+    throw new Error('Test failed');
+  }
+}