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

@@ -2782,3 +2782,60 @@ error
 '
 )
 ;
+subsetTest
+(
+promise_test
+async
+test
+=
+>
+{
+let
+dfss
+=
+false
+;
+navigator
+.
+runAdAuction
+(
+{
+get
+directFromSellerSignalsHeaderAdSlot
+(
+)
+{
+dfss
+=
+true
+;
+}
+}
+)
+.
+catch
+(
+(
+e
+)
+=
+>
+{
+}
+)
+;
+assert_true
+(
+dfss
+)
+;
+}
+'
+Test
+directFromSellerSignals
+feature
+detection
+.
+'
+)
+;