1 files changed, 70 insertions, 0 deletions
diff --git a/browser/components/translations/tests/browser/browser_translations_full_page_panel_switch_languages.js b/browser/components/translations/tests/browser/browser_translations_full_page_panel_switch_languages.js
new file mode 100644
index 0000000000..0c5db67b20
--- /dev/null
+++ b/browser/components/translations/tests/browser/browser_translations_full_page_panel_switch_languages.js
@@ -0,0 +1,70 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests switching the language.
+ */
+add_task(async function test_translations_panel_switch_language() {
+  const { cleanup, resolveDownloads, runInPage } = await loadTestPage({
+    page: SPANISH_PAGE_URL,
+    languagePairs: LANGUAGE_PAIRS,
+  });
+
+  await FullPageTranslationsTestUtils.assertTranslationsButton(
+    { button: true },
+    "The button is available."
+  );
+
+  await FullPageTranslationsTestUtils.assertPageIsUntranslated(runInPage);
+
+  await FullPageTranslationsTestUtils.openPanel({
+    onOpenPanel: FullPageTranslationsTestUtils.assertPanelViewDefault,
+  });
+
+  const { translateButton } = FullPageTranslationsPanel.elements;
+
+  ok(!translateButton.disabled, "The translate button starts as enabled");
+
+  FullPageTranslationsTestUtils.assertSelectedFromLanguage({ langTag: "es" });
+  FullPageTranslationsTestUtils.assertSelectedToLanguage({ langTag: "en" });
+
+  FullPageTranslationsTestUtils.switchSelectedFromLanguage("en");
+
+  ok(
+    translateButton.disabled,
+    "The translate button is disabled when the languages are the same"
+  );
+
+  FullPageTranslationsTestUtils.switchSelectedFromLanguage("es");
+
+  ok(
+    !translateButton.disabled,
+    "When the languages are different it can be translated"
+  );
+
+  FullPageTranslationsTestUtils.switchSelectedFromLanguage("");
+
+  ok(
+    translateButton.disabled,
+    "The translate button is disabled nothing is selected."
+  );
+
+  FullPageTranslationsTestUtils.switchSelectedFromLanguage("en");
+  FullPageTranslationsTestUtils.switchSelectedToLanguage("fr");
+
+  ok(!translateButton.disabled, "The translate button can now be used");
+
+  await FullPageTranslationsTestUtils.clickTranslateButton({
+    downloadHandler: resolveDownloads,
+  });
+
+  await FullPageTranslationsTestUtils.assertPageIsTranslated(
+    "en",
+    "fr",
+    runInPage
+  );
+
+  await cleanup();
+});