1 files changed, 52 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_tabs_lastAccessed.js b/browser/components/extensions/test/browser/browser_ext_tabs_lastAccessed.js
new file mode 100644
index 0000000000..c4738d7f2e
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_tabs_lastAccessed.js
@@ -0,0 +1,52 @@
+"use strict";
+
+add_task(async function testLastAccessed() {
+  let past = Date.now();
+
+  for (let url of ["https://example.com/?1", "https://example.com/?2"]) {
+    let tab = BrowserTestUtils.addTab(gBrowser, url, { skipAnimation: true });
+    await BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, url);
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["tabs"],
+    },
+    async background() {
+      browser.test.onMessage.addListener(async function (msg, past) {
+        let [tab1] = await browser.tabs.query({
+          url: "https://example.com/?1",
+        });
+        let [tab2] = await browser.tabs.query({
+          url: "https://example.com/?2",
+        });
+
+        browser.test.assertTrue(tab1 && tab2, "Expected tabs were found");
+
+        let now = Date.now();
+
+        browser.test.assertTrue(
+          past <= tab1.lastAccessed,
+          "lastAccessed of tab 1 is later than the test start time."
+        );
+        browser.test.assertTrue(
+          tab1.lastAccessed < tab2.lastAccessed,
+          "lastAccessed of tab 2 is later than lastAccessed of tab 1."
+        );
+        browser.test.assertTrue(
+          tab2.lastAccessed <= now,
+          "lastAccessed of tab 2 is earlier than now."
+        );
+
+        await browser.tabs.remove([tab1.id, tab2.id]);
+
+        browser.test.notifyPass("tabs.lastAccessed");
+      });
+    },
+  });
+
+  await extension.startup();
+  await extension.sendMessage("past", past);
+  await extension.awaitFinish("tabs.lastAccessed");
+  await extension.unload();
+});