1 files changed, 60 insertions, 0 deletions
diff --git a/testing/web-platform/tests/speculation-rules/prefetch/navigation-timing-sizes.https.html b/testing/web-platform/tests/speculation-rules/prefetch/navigation-timing-sizes.https.html
new file mode 100644
index 0000000000..19c254ca1d
--- /dev/null
+++ b/testing/web-platform/tests/speculation-rules/prefetch/navigation-timing-sizes.https.html
@@ -0,0 +1,60 @@
+<!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>
+
+<meta name="variant" content="">
+<meta name="variant" content="?bypass_cache=true">
+<meta name="variant" content="?prefetch=true">
+<meta name="variant" content="?prefetch=true&bypass_cache=true">
+
+<script>
+const searchParams = new URLSearchParams(location.search);
+const prefetchEnabled = searchParams.has('prefetch');
+const bypassCache = searchParams.has('bypass_cache');
+
+// Header size: https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-transfersize
+const headerSize = 300;
+
+promise_test(async t => {
+    assert_implements(HTMLScriptElement.supports('speculationrules'),
+      "Speculation Rules not supported");
+
+    const agent = await spawnWindow(t);
+    // Some meaningless query param to avoid cached response.
+    const prefetchUrl =
+      bypassCache ? agent.getExecutorURL({ a: "b" }) : agent.getExecutorURL();
+
+    if (prefetchEnabled)
+      await agent.forceSinglePrefetch(prefetchUrl);
+
+    await agent.navigate(prefetchUrl);
+
+    if (prefetchEnabled)
+      assert_prefetched(await agent.getRequestHeaders(),
+        `Prefetch ${prefetchUrl.href} should work.`);
+    else
+      assert_not_prefetched(await agent.getRequestHeaders(),
+        `${prefetchUrl.href} should not be prefetched.`);
+
+    await agent.execute_script(
+      () => window.entries = performance.getEntriesByType('navigation'));
+
+    // TODO(crbug/1317756): Currently the initial prefetch request bypasses the
+    // HTTP cache. Expand test coverage for cache and cache+revalidation cases.
+    //
+    // We do not assert the exact size of `resources/executor.sub.html` since it
+    // would be a headache to update this test everytime executor.sub.html
+    // changes.
+    assert_equals(await agent.execute_script(() => window.entries.length), 1,
+      'Wrong number of entries');
+    const entry =
+      await agent.execute_script(() => window.entries[0]);
+    const bodySize = entry.encodedBodySize;
+    assert_greater_than(bodySize, 0);
+    assert_equals(entry.transferSize, headerSize + bodySize);
+    assert_equals(entry.decodedBodySize, bodySize);
+  }, `PerformanceNavigationTiming.transferSize/encodedBodySize/decodedBodySize test, same origin prefetch.`);
+</script>