1 files changed, 76 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction_runtime.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction_runtime.js
new file mode 100644
index 0000000000..55c83ee0b1
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction_runtime.js
@@ -0,0 +1,76 @@
+"use strict";
+
+function background() {
+  browser.runtime.onConnect.addListener(port => {
+    browser.test.assertEq(port.name, "ernie", "port name correct");
+    port.onDisconnect.addListener(() => {
+      browser.test.assertEq(
+        null,
+        port.error,
+        "The port is implicitly closed without errors when the other context unloads"
+      );
+      port.disconnect();
+      browser.test.sendMessage("disconnected");
+    });
+    browser.test.sendMessage("connected");
+  });
+}
+
+let extensionData = {
+  background,
+  manifest: {
+    sidebar_action: {
+      default_panel: "sidebar.html",
+    },
+  },
+  useAddonManager: "temporary",
+
+  files: {
+    "sidebar.html": `
+      <!DOCTYPE html>
+      <html>
+      <head><meta charset="utf-8"/>
+      <script src="sidebar.js"></script>
+      </head>
+      <body>
+      A Test Sidebar
+      </body></html>
+    `,
+
+    "sidebar.js": function () {
+      window.onload = () => {
+        browser.runtime.connect({ name: "ernie" });
+      };
+    },
+  },
+};
+
+add_task(async function test_sidebar_disconnect() {
+  let extension = ExtensionTestUtils.loadExtension(extensionData);
+  let connected = extension.awaitMessage("connected");
+  await extension.startup();
+  await connected;
+
+  // Bug 1445080 fixes currentURI, test to avoid future breakage.
+  let currentURI = window.SidebarUI.browser.contentDocument.getElementById(
+    "webext-panels-browser"
+  ).currentURI;
+  is(currentURI.scheme, "moz-extension", "currentURI is set correctly");
+
+  // switching sidebar to another extension
+  let extension2 = ExtensionTestUtils.loadExtension(extensionData);
+  let switched = Promise.all([
+    extension.awaitMessage("disconnected"),
+    extension2.awaitMessage("connected"),
+  ]);
+  await extension2.startup();
+  await switched;
+
+  // switching sidebar to built-in sidebar
+  let disconnected = extension2.awaitMessage("disconnected");
+  window.SidebarUI.show("viewBookmarksSidebar");
+  await disconnected;
+
+  await extension.unload();
+  await extension2.unload();
+});