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diff --git a/packages/taler-wallet-webextension/src/i18n-test.tsx b/packages/taler-wallet-webextension/src/i18n-test.tsx
new file mode 100644
index 000000000..e17a455ce
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+++ b/packages/taler-wallet-webextension/src/i18n-test.tsx
@@ -0,0 +1,68 @@
+/*
+ This file is part of GNU Taler
+ (C) 2020 Taler Systems SA
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import test from "ava";
+import { internalSetStrings, str, Translate, strings } from "./i18n";
+import React from "react";
+import { render } from "enzyme";
+import { configure } from "enzyme";
+import Adapter from "enzyme-adapter-react-16";
+
+configure({ adapter: new Adapter() });
+
+const testStrings = {
+  domain: "messages",
+  locale_data: {
+    messages: {
+      str1: ["foo1"],
+      str2: [""],
+      "str3 %1$s / %2$s": ["foo3 %2$s ; %1$s"],
+      "": {
+        domain: "messages",
+        plural_forms: "nplurals=2; plural=(n != 1);",
+        lang: "",
+      },
+    },
+  },
+};
+
+test("str translation", (t) => {
+  // Alias, so we nly use the function for lookups, not for string extranction.
+  const strAlias = str;
+  const TranslateAlias = Translate;
+  internalSetStrings(testStrings);
+  t.is(strAlias`str1`, "foo1");
+  t.is(strAlias`str2`, "str2");
+  const a = "a";
+  const b = "b";
+  t.is(strAlias`str3 ${a} / ${b}`, "foo3 b ; a");
+  const r = render(<TranslateAlias>str1</TranslateAlias>);
+  t.is(r.text(), "foo1");
+
+  const r2 = render(
+    <TranslateAlias>
+      str3 <span>{a}</span> / <span>{b}</span>
+    </TranslateAlias>,
+  );
+  t.is(r2.text(), "foo3 b ; a");
+
+  t.pass();
+});
+
+test("existing str translation", (t) => {
+  internalSetStrings(strings);
+  t.pass();
+});