diff --git a/tests/api.test.js b/tests/api.test.js
index 936938f..d29db22 100644
--- a/tests/api.test.js
+++ b/tests/api.test.js
@@ -285,4 +285,15 @@ describe("Test /api/", () => {
     expect(res.setHeader).toBeCalledWith("Content-Type", "image/svg+xml");
     expect(res.send).toBeCalledWith(renderError("Something went wrong"));
   });
+
+  it("should render error card when wrong locale is provided", async () => {
+    const { req, res } = faker({ locale: "asdf" }, data_stats);
+
+    await api(req, res);
+
+    expect(res.setHeader).toBeCalledWith("Content-Type", "image/svg+xml");
+    expect(res.send).toBeCalledWith(
+      renderError("Something went wrong", "Language not found"),
+    );
+  });
 });