diff --git a/server/src/utils/crc16.test.ts b/server/src/utils/crc16.test.ts
new file mode 100644
index 00000000..d7c89b09
--- /dev/null
+++ b/server/src/utils/crc16.test.ts
@@ -0,0 +1,14 @@
+import {crc16} from "./crc16"
+
+describe("crc16", () => {
+    it("calculates CRC16 for strings", () => {
+        expect(crc16("123456789")).toBe(0x31_c3)
+        expect(crc16("hello world")).toBe(0x3b_e4)
+        expect(crc16("Test")).toBe(0xac_48)
+    })
+
+    it("calculates CRC16 for byte arrays", () => {
+        expect(crc16(Uint8Array.from([1, 2, 3, 4]))).toBe(0x0d_03)
+        expect(crc16(Uint8Array.from([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc]))).toBe(0xa6_50)
+    })
+})