diff --git a/tests/renderStatsCard.test.ts b/tests/renderStatsCard.test.ts
index f0feb0fb..e7e6d175 100644
--- a/tests/renderStatsCard.test.ts
+++ b/tests/renderStatsCard.test.ts
@@ -17,7 +17,12 @@ jest.mock("express", () => ({
   },
 }));
 
-const exampleUserData: User = {
+type ExtendUser = User & {
+  joinedAt: string;
+  totalCommitsSinceJoined: number;
+}
+
+const exampleUserData: ExtendUser = {
   name: "Fajar",
   login: "FajarKim",
   avatarUrl: "base64-encoded-image",
@@ -34,6 +39,8 @@ const exampleUserData: User = {
   totalCommitContributions: 1200,
   restrictedContributionsCount: 130,
   totalPullRequestReviewContributions: 340,
+  joinedAt: "2020-01-01T00:00:00Z",
+  totalCommitsSinceJoined: 1500,
 };
 
 describe("Test GitHub Readme Profile API", () => {
@@ -52,6 +59,8 @@ describe("Test GitHub Readme Profile API", () => {
       status: jest.fn(),
     };
 
+    (getData as jest.Mock).mockResolvedValue(exampleUserData);
+
     jest.clearAllMocks();
   });
 
@@ -148,4 +157,19 @@ describe("Test GitHub Readme Profile API", () => {
     expect(mockResponse.send).toHaveBeenCalled();
     expect(mockResponse.json).not.toHaveBeenCalled();
   });
+
+  it("should correctly fetch user join date and total commits since joining", async () => {
+    mockRequest.query.username = "FajarKim";
+    (getData as jest.Mock).mockResolvedValueOnce(exampleUserData);
+
+    await readmeStats(mockRequest, mockResponse);
+
+    expect(getData).toHaveBeenCalledWith(mockRequest.query.username);
+    expect(mockResponse.json).toHaveBeenCalledWith(
+      expect.objectContaining({
+        joinedAt: "2020-01-01T00:00:00Z",
+        totalCommitsSinceJoined: 1500,
+      })
+    );
+  });
 });