1 files changed, 29 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_tabSwitchPrintPreview.js b/browser/base/content/test/tabs/browser_tabSwitchPrintPreview.js
new file mode 100644
index 000000000..4ec36a7cc
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_tabSwitchPrintPreview.js
@@ -0,0 +1,29 @@
+const kURL1 = "data:text/html,Should I stay or should I go?";
+const kURL2 = "data:text/html,I shouldn't be here!";
+
+add_task(function* setup() {
+  yield SpecialPowers.pushPrefEnv({
+    set: [["dom.ipc.processCount", 1]]
+  });
+});
+
+/**
+ * Verify that if we open a new tab and try to make it the selected tab while
+ * print preview is up, that doesn't happen.
+ */
+add_task(function* () {
+  yield BrowserTestUtils.withNewTab(kURL1, function* (browser) {
+    let tab = gBrowser.addTab(kURL2);
+    document.getElementById("cmd_printPreview").doCommand();
+    gBrowser.selectedTab = tab;
+    yield BrowserTestUtils.waitForCondition(() => gInPrintPreviewMode, "should be in print preview mode");
+    isnot(gBrowser.selectedTab, tab, "Selected tab should not be the tab we added");
+    is(gBrowser.selectedTab, PrintPreviewListener._printPreviewTab, "Selected tab should be the print preview tab");
+    gBrowser.selectedTab = tab;
+    isnot(gBrowser.selectedTab, tab, "Selected tab should still not be the tab we added");
+    is(gBrowser.selectedTab, PrintPreviewListener._printPreviewTab, "Selected tab should still be the print preview tab");
+    PrintUtils.exitPrintPreview();
+    yield BrowserTestUtils.waitForCondition(() => !gInPrintPreviewMode, "should be in print preview mode");
+    yield BrowserTestUtils.removeTab(tab);
+  });
+});