1 files changed, 60 insertions, 0 deletions
diff --git a/toolkit/components/printing/tests/browser_preview_in_container.js b/toolkit/components/printing/tests/browser_preview_in_container.js
new file mode 100644
index 0000000000..21a0d1e6b1
--- /dev/null
+++ b/toolkit/components/printing/tests/browser_preview_in_container.js
@@ -0,0 +1,60 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+
+async function runTest() {
+  is(
+    document.querySelector(".printPreviewBrowser"),
+    null,
+    "There shouldn't be any print preview browser"
+  );
+
+  gBrowser.selectedTab = await BrowserTestUtils.addTab(
+    gBrowser,
+    `${TEST_PATH}file_print.html`,
+    { userContextId: 1 }
+  );
+
+  // Wait for window.print() to run and ensure we're showing the preview...
+  await BrowserTestUtils.waitForCondition(
+    () => !!document.querySelector(".printPreviewBrowser")
+  );
+
+  let previewBrowser = document.querySelector(".printPreviewBrowser");
+  let contentFound = await SpecialPowers.spawn(previewBrowser, [], () => {
+    return !!content.document.getElementById("printed");
+  });
+  ok(contentFound, "We should find the preview content.");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+}
+
+add_task(async function test_in_container() {
+  // window.print() only shows print preview when print.tab_modal.enabled is
+  // true.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["print.tab_modal.enabled", true],
+      ["privacy.firstparty.isolate", false],
+    ],
+  });
+
+  await runTest();
+});
+
+add_task(async function test_with_fpi() {
+  // window.print() only shows print preview when print.tab_modal.enabled is
+  // true.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["print.tab_modal.enabled", true],
+      ["privacy.firstparty.isolate", true],
+    ],
+  });
+  await runTest();
+});