1 files changed, 71 insertions, 0 deletions
diff --git a/toolkit/components/extensions/test/xpcshell/test_ext_contentscript_perf_observers.js b/toolkit/components/extensions/test/xpcshell/test_ext_contentscript_perf_observers.js
new file mode 100644
index 0000000000..2546b257fb
--- /dev/null
+++ b/toolkit/components/extensions/test/xpcshell/test_ext_contentscript_perf_observers.js
@@ -0,0 +1,71 @@
+"use strict";
+
+const server = createHttpServer({
+  hosts: ["a.example.com", "b.example.com", "c.example.com"],
+});
+server.registerDirectory("/data/", do_get_file("data"));
+
+add_task(async function test_perf_observers_cors() {
+  const extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["http://b.example.com/"],
+      content_scripts: [
+        {
+          matches: ["http://a.example.com/data/file_sample.html"],
+          js: ["cs.js"],
+        },
+      ],
+    },
+    files: {
+      "cs.js"() {
+        let obs = new window.PerformanceObserver(list => {
+          list.getEntries().forEach(e => {
+            browser.test.sendMessage("observed", {
+              url: e.name,
+              time: e.connectEnd,
+              size: e.encodedBodySize,
+            });
+          });
+        });
+        obs.observe({ entryTypes: ["resource"] });
+
+        let b = document.createElement("link");
+        b.rel = "stylesheet";
+
+        // Simulate page including a cross-origin resource from b.example.com.
+        b.wrappedJSObject.href = "http://b.example.com/data/file_download.txt";
+        document.head.appendChild(b);
+
+        let c = document.createElement("link");
+        c.rel = "stylesheet";
+
+        // Simulate page including a cross-origin resource from c.example.com.
+        c.wrappedJSObject.href = "http://c.example.com/data/file_download.txt";
+        document.head.appendChild(c);
+      },
+    },
+  });
+
+  let page = await ExtensionTestUtils.loadContentPage(
+    "http://a.example.com/data/file_sample.html"
+  );
+  await extension.startup();
+
+  let b = await extension.awaitMessage("observed");
+  let c = await extension.awaitMessage("observed");
+
+  if (b.url.startsWith("http://c.")) {
+    [c, b] = [b, c];
+  }
+
+  ok(b.url.startsWith("http://b."), "Observed resource from b.example.com");
+  ok(b.time > 0, "connectionEnd available from b.example.com");
+  equal(b.size, 46, "encodedBodySize available from b.example.com");
+
+  ok(c.url.startsWith("http://c."), "Observed resource from c.example.com");
+  equal(c.time, 0, "connectionEnd == 0 from c.example.com");
+  equal(c.size, 0, "encodedBodySize == 0 from c.example.com");
+
+  await extension.unload();
+  await page.close();
+});