1 files changed, 40 insertions, 0 deletions
diff --git a/browser/base/content/test/general/browser_tabs_owner.js b/browser/base/content/test/general/browser_tabs_owner.js
new file mode 100644
index 0000000000..4a32da12f1
--- /dev/null
+++ b/browser/base/content/test/general/browser_tabs_owner.js
@@ -0,0 +1,40 @@
+function test() {
+  BrowserTestUtils.addTab(gBrowser);
+  BrowserTestUtils.addTab(gBrowser);
+  BrowserTestUtils.addTab(gBrowser);
+
+  var owner;
+
+  is(gBrowser.tabs.length, 4, "4 tabs are open");
+
+  owner = gBrowser.selectedTab = gBrowser.tabs[2];
+  BrowserOpenTab();
+  is(gBrowser.selectedTab, gBrowser.tabs[4], "newly opened tab is selected");
+  gBrowser.removeCurrentTab();
+  is(gBrowser.selectedTab, owner, "owner is selected");
+
+  owner = gBrowser.selectedTab;
+  BrowserOpenTab();
+  gBrowser.selectedTab = gBrowser.tabs[1];
+  gBrowser.selectedTab = gBrowser.tabs[4];
+  gBrowser.removeCurrentTab();
+  isnot(
+    gBrowser.selectedTab,
+    owner,
+    "selecting a different tab clears the owner relation"
+  );
+
+  owner = gBrowser.selectedTab;
+  BrowserOpenTab();
+  gBrowser.moveTabTo(gBrowser.selectedTab, 0);
+  gBrowser.removeCurrentTab();
+  is(
+    gBrowser.selectedTab,
+    owner,
+    "owner relationship persists when tab is moved"
+  );
+
+  while (gBrowser.tabs.length > 1) {
+    gBrowser.removeCurrentTab();
+  }
+}