test: initialize test/wpt to run URL and console .js tests

This patch:

- Creates a new test suite `wpt` that can be used to run a subset
  of Web Platform Tests
- Adds a `WPTRunner` in `test/common/wpt.js` that can run the WPT
  subset in `test/fixtures/wpt` with a vm and the WPT harness
  while taking the status file in `test/wpt/status` into account.
  Here we use a new format of status file (in JSON) to handle specific
  requirements (like ICU requirements) in the tests and to handle
  expected failures and TODOs.
- Adds documentation on how the runner and the update automation works
- Runs the WHATWG URL tests and the console tests with the new test
  runner.

With this patch we eliminates the need of copy-pasting with manual
modifications to update a large chunk of our WPT subset previously
maintained in `test/parallel`. Now the tests run in `test/wpt` can
be automatically updated with `git node wpt` without modifications
by the actual WPT harness instead of our home-grown mock.

There are still a few URL tests left that need to be migrated in the
upstream to be placed in .js instead of .html - we currently still use
the legacy harness mock in the test files.

PR-URL: https://github.com/nodejs/node/pull/24035
Refs: https://github.com/nodejs/node/issues/23192
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/test/parallel/test-whatwg-url-custom-searchparams-sort.js b/test/parallel/test-whatwg-url-custom-searchparams-sort.js
index f8884a7e70..49c3b065f9 100644
--- a/test/parallel/test-whatwg-url-custom-searchparams-sort.js
+++ b/test/parallel/test-whatwg-url-custom-searchparams-sort.js
@@ -4,9 +4,14 @@
 
 require('../common');
 const { URL, URLSearchParams } = require('url');
-const { test, assert_array_equals } = require('../common/wpt');
+const { test, assert_array_equals } = require('../common/wpt').harness;
 
-// Test bottom-up iterative stable merge sort
+// TODO(joyeecheung): upstream this to WPT, if possible - even
+// just as a test for large inputs. Other implementations may
+// have a similar cutoff anyway.
+
+// Test bottom-up iterative stable merge sort because we only use that
+// algorithm to sort > 100 search params.
 const tests = [{ input: '', output: [] }];
 const pairs = [];
 for (let i = 10; i < 100; i++) {