URL: run IdnaTestV2.txt in WPT

.gitignore

@@ -46,6 +46,7 @@ scratch
 /css/dist
 /css/dist_last
 /css/tools/cache
+/url/tools/IdnaTestV2.txt
 /webaudio/idl/*
 
 # w3c-test.org PR-branch mirroring

url/IdnaTestV2.window.js

@@ -0,0 +1,27 @@
+promise_test(() => fetch("resources/IdnaTestV2.json").then(res => res.json()).then(runTests), "Loading data…");
+
+function runTests(idnaTests) {
+  for (const idnaTest of idnaTests) {
+    if (typeof idnaTest === "string") {
+      continue // skip comments
+    }
+    if (idnaTest.input === "") {
+      continue // cannot test empty string input through new URL()
+    }
+    // Percent-encode the input such that ? and equivalent code points do not end up counting as
+    // part of the URL, but are parsed through the host parser instead.
+    const encodedInput = encodeURIComponent(idnaTest.input);
+
+    test(() => {
+      if (idnaTest.output === null) {
+        assert_throws_js(TypeError, () => new URL(`https://${encodedInput}/x`));
+      } else {
+        const url = new URL(`https://${encodedInput}/x`);
+        assert_equals(url.host, idnaTest.output);
+        assert_equals(url.hostname, idnaTest.output);
+        assert_equals(url.pathname, "/x");
+        assert_equals(url.href, `https://${idnaTest.output}/x`);
+      }
+    }, `ToASCII("${idnaTest.input}")${idnaTest.comment ? " " + idnaTest.comment : ""}`);
+  }
+}

url/resources/IdnaTestV2-feedback.txt

@@ -0,0 +1,13 @@
+2023-01. Feedback by Anne van Kesteren on
+
+  https://unicode.org/Public/idna/latest/IdnaTestV2.txt
+  Date: 2022-05-26, 22:30:12 GMT
+
+(I have almost exclusively focused on ToASCII cases.)
+
+* VerifyDnsLength is not P4, but rather A4_1 and A4_2.
+* Tests that use trailing ASCII digit labels are not useful for browsers as that will trigger the IPv4 parser. This is a problem for a number of the A4_1 and A4_2 tests. And also a large number of tests later on, such as ToASCII("xn--gl0as212a.8.") or ToASCII("1.27").
+* Test for ToASCII("$") is marked P1 and V6, not U1. This also effects numerous tests with <, >, and =. If they continue to have multiple statuses that will also make it impossible to filter them in an automated fashion.
+* NV8 is not used as a status.
+* A3 and X3 do not appear to be used as a status. (These are catered for by P4 presumably.)
+* CheckBidi is not V8. V8 does not appear to be used. You'd have to filter out all B1-6 statuses instead.