1 files changed, 72 insertions, 0 deletions
diff --git a/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_destroy_pending.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_destroy_pending.js
new file mode 100644
index 0000000000..cfe1997093
--- /dev/null
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_engine_destroy_pending.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Manually destroy the engine while a page is in the background, and test that the page
+ * is still translated after switching back to it.
+ */
+add_task(async function test_translations_engine_destroy_pending() {
+  const {
+    cleanup,
+    resolveDownloads,
+    runInPage,
+    tab: spanishTab,
+  } = await loadTestPage({
+    page: SPANISH_PAGE_URL,
+    languagePairs: LANGUAGE_PAIRS,
+  });
+
+  await FullPageTranslationsTestUtils.assertTranslationsButton(
+    { button: true },
+    "The button is available."
+  );
+  await FullPageTranslationsTestUtils.openPanel({
+    onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
+  });
+
+  await FullPageTranslationsTestUtils.clickTranslateButton({
+    downloadHandler: resolveDownloads,
+  });
+
+  await FullPageTranslationsTestUtils.assertPageIsTranslated(
+    "es",
+    "en",
+    runInPage
+  );
+
+  const { removeTab: removeEnglishTab } = await addTab(
+    ENGLISH_PAGE_URL,
+    "Creating a new tab for a page in English."
+  );
+
+  info("Destroy the engine process");
+  await EngineProcess.destroyTranslationsEngine();
+
+  info("Mutate the page's content to re-trigger a translation.");
+  await runInPage(async TranslationsTest => {
+    const { getH1 } = TranslationsTest.getSelectors();
+    getH1().innerText = "New text for the H1";
+  });
+
+  info("Wait for a second to ensure the mutation takes.");
+  await TestUtils.waitForTick();
+
+  await switchTab(spanishTab, "spanish tab");
+
+  info("The engine downloads should be requested again.");
+  resolveDownloads(1);
+
+  await runInPage(async TranslationsTest => {
+    const { getH1 } = TranslationsTest.getSelectors();
+    await TranslationsTest.assertTranslationResult(
+      "The mutated content should be translated.",
+      getH1,
+      "NEW TEXT FOR THE H1 [es to en]"
+    );
+  });
+
+  await removeEnglishTab();
+  await cleanup();
+});