1 files changed, 50 insertions, 0 deletions
diff --git a/browser/components/contextualidentity/test/browser/browser_middleClick.js b/browser/components/contextualidentity/test/browser/browser_middleClick.js
new file mode 100644
index 0000000000..9b9fbcb737
--- /dev/null
+++ b/browser/components/contextualidentity/test/browser/browser_middleClick.js
@@ -0,0 +1,50 @@
+"use strict";
+
+const BASE_ORIGIN = "http://example.com";
+const URI =
+  BASE_ORIGIN +
+  "/browser/browser/components/contextualidentity/test/browser/empty_file.html";
+
+add_task(async function () {
+  info("Opening a new container tab...");
+
+  let tab = BrowserTestUtils.addTab(gBrowser, URI, { userContextId: 1 });
+  gBrowser.selectedTab = tab;
+
+  let browser = gBrowser.getBrowserForTab(tab);
+  await BrowserTestUtils.browserLoaded(browser);
+
+  info("Create a HTMLAnchorElement...");
+  await SpecialPowers.spawn(browser, [URI], function (uri) {
+    let anchor = content.document.createElement("a");
+    anchor.setAttribute("id", "clickMe");
+    anchor.setAttribute("href", uri);
+    anchor.appendChild(content.document.createTextNode("click me!"));
+    content.document.body.appendChild(anchor);
+  });
+
+  info("Synthesize a mouse click and wait for a new tab...");
+  let newTab = await new Promise((resolve, reject) => {
+    gBrowser.tabContainer.addEventListener(
+      "TabOpen",
+      function (openEvent) {
+        resolve(openEvent.target);
+      },
+      { once: true }
+    );
+
+    BrowserTestUtils.synthesizeMouseAtCenter(
+      "#clickMe",
+      { button: 1 },
+      browser
+    );
+  });
+
+  is(newTab.getAttribute("usercontextid"), "1", "Correct UserContextId?");
+
+  // newTab shouldn't be closed in the same event tick as TabOpen.
+  await TestUtils.waitForTick();
+
+  BrowserTestUtils.removeTab(tab);
+  BrowserTestUtils.removeTab(newTab);
+});