diff --git a/test/unit/crypto.test.ts b/test/unit/crypto.test.ts
index 90ef7f836a..9261bf5a84 100644
--- a/test/unit/crypto.test.ts
+++ b/test/unit/crypto.test.ts
@@ -27,6 +27,7 @@ describe("webhook signature verification", () => {
     expect(timingSafeEqualHex("", "00")).toBe(false);
     expect(timingSafeEqualHex("00", "01")).toBe(false);
     expect(timingSafeEqualHex("00", "00")).toBe(true);
+    expect(timingSafeEqualHex("ABCD", "abcd")).toBe(true);
   });
 
   it("uses timing-safe token comparisons and one-way token hashes", async () => {