diff --git a/src/utils/evm.test.ts b/src/utils/evm.test.ts
new file mode 100644
index 00000000..fb8a471a
--- /dev/null
+++ b/src/utils/evm.test.ts
@@ -0,0 +1,35 @@
+import { describe, expect, test } from "bun:test";
+import {
+  coinTypeToEvmChainId,
+  evmChainIdToCoinType,
+  isEvmCoinType,
+} from "./evm.js";
+
+describe("isEvmCoinType()", () => {
+  test("non evm coin type", () => {
+    expect(isEvmCoinType(1000)).toBeFalse();
+  });
+  test("evm coin type", () => {
+    expect(isEvmCoinType(2147483658)).toBeTrue();
+  });
+});
+
+describe("evmChainIdToCoinType()", () => {
+  test("normal chainId", () => {
+    expect(evmChainIdToCoinType(10)).toBe(2147483658);
+  });
+  test("chainId too large", () => {
+    expect(() => evmChainIdToCoinType(2147483648)).toThrow("Invalid chainId");
+  });
+});
+
+describe("coinTypeToEvmChainId()", () => {
+  test("non evm coin type", () => {
+    expect(() => coinTypeToEvmChainId(1000)).toThrow(
+      "Coin type is not an EVM chain"
+    );
+  });
+  test("evm coin type", () => {
+    expect(coinTypeToEvmChainId(2147483658)).toBe(10);
+  });
+});