Bug 1864973 [wpt PR 43188] - Add tests for feature detection logic, a…

…=testonly

Automatic update from web-platform-tests
Add tests for feature detection logic

I'll be removing the feature flag in a subsequent CL now that we've
shipped, so I don't test the flag off case.

More context on the feature detection method at
WICG/turtledove#803

Bug: 1462720
Change-Id: Ica63b282e3c380aa09f2ee8a6fc93e89ae9ce21f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5034265
Commit-Queue: Caleb Raitto <caraittochromium.org>
Reviewed-by: Matt Menke <mmenkechromium.org>
Cr-Commit-Position: refs/heads/main{#1225565}

--

wpt-commits: e95e83675b27957f4d0e60dffcb4cc6cedcccb3f
wpt-pr: 43188

UltraBlame original commit: b7a446823cf90ff4f71ea6e1ffb4fa7244d87c0e

testing/web-platform/tests/fledge/tentative/direct-from-seller-signals.https.window.js

@@ -18,15 +18,14 @@ subsetTest(promise_test, async test => {
   await runReportTest(
       test, uuid,
       directFromSellerSignalsValidatorCode(
-          uuid, null,
-          null, null),
+          uuid,  null,
+           null,  null),
 
       [createSellerReportURL(uuid), createBidderReportURL(uuid)],
 
       null,
 
-      { directFromSellerSignalsHeaderAdSlot: 'adSlot/0'}
-  );
+      {directFromSellerSignalsHeaderAdSlot: 'adSlot/0'});
 }, 'Test directFromSellerSignals with empty Ad-Auction-Signals header.');
 
 subsetTest(promise_test, async test => {
@@ -495,3 +494,11 @@ subsetTest(promise_test, async test => {
       { directFromSellerSignalsHeaderAdSlot: 'adSlot' }
   );
 }, 'Test directFromSellerSignals with network error.');
+
+subsetTest(promise_test, async test => {
+  let dfss = false;
+  navigator.runAdAuction({
+      get directFromSellerSignalsHeaderAdSlot() { dfss = true; }
+  }).catch((e) => {});
+  assert_true(dfss);
+}, 'Test directFromSellerSignals feature detection.');