diff --git a/tests/top-langs.test.js b/tests/top-langs.test.js
index 3f4e594aa7295a..f1c7d0082f38a3 100644
--- a/tests/top-langs.test.js
+++ b/tests/top-langs.test.js
@@ -167,4 +167,22 @@ describe("Test /api/top-langs", () => {
       renderError("Something went wrong", "Incorrect layout input"),
     );
   });
+
+  it("should render error card if username in blacklist", async () => {
+    const req = {
+      query: {
+        username: "renovate-bot",
+      },
+    };
+    const res = {
+      setHeader: jest.fn(),
+      send: jest.fn(),
+    };
+    mock.onPost("https://api.github.com/graphql").reply(200, data_langs);
+
+    await topLangs(req, res);
+
+    expect(res.setHeader).toBeCalledWith("Content-Type", "image/svg+xml");
+    expect(res.send).toBeCalledWith(renderError("Something went wrong"));
+  });
 });