1 files changed, 21 insertions, 0 deletions
diff --git a/testing/web-platform/tests/speculation-rules/prefetch/duplicate-urls.https.html b/testing/web-platform/tests/speculation-rules/prefetch/duplicate-urls.https.html
new file mode 100644
index 0000000000..179bbdfd68
--- /dev/null
+++ b/testing/web-platform/tests/speculation-rules/prefetch/duplicate-urls.https.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script src="/common/utils.js"></script>
+<script src="resources/utils.sub.js"></script>
+
+<script>
+  promise_test(async t => {
+    assert_implements(HTMLScriptElement.supports('speculationrules'), "Speculation Rules not supported");
+
+    let urls = Array(5).fill(getPrefetchUrlList(1)[0]);
+    insertSpeculationRules({ prefetch: [{ source: 'list', urls: urls }] });
+    await new Promise(resolve => t.step_timeout(resolve, 2000));
+
+    let prefetched_count = (await Promise.all(urls.map(isUrlPrefetched))).reduce(
+      (count, was_prefetched) => count + (was_prefetched ? 1 : 0), 0);
+
+    assert_equals(prefetched_count, 1, "url should be prefetched just once.");
+  }, "browser should remove duplicate urls from prefetch buffer.");
+</script>