diff --git a/packages/bridge-ui/src/utils/switchEthereumChain.spec.ts b/packages/bridge-ui/src/utils/switchEthereumChain.spec.ts
new file mode 100644
index 00000000000..23588194451
--- /dev/null
+++ b/packages/bridge-ui/src/utils/switchEthereumChain.spec.ts
@@ -0,0 +1,63 @@
+import type { Ethereum } from '@wagmi/core';
+import type { Chain } from '../domain/chain';
+import { ethers } from 'ethers';
+import { switchEthereumChain } from './switchEthereumChain';
+
+const ethereum = {
+  request: jest.fn(),
+};
+
+const chain = {
+  id: 1,
+  name: 'Ethereum Mainnet',
+  rpc: 'rpc',
+  explorerUrl: '',
+  bridgeAddress: '',
+  headerSyncAddress: '',
+} as Chain;
+
+describe('switchEthereumChain()', () => {
+  beforeEach(() => {
+    jest.resetAllMocks();
+  });
+
+  it('should switchEthereumChain switches to the correct chain', async () => {
+    await switchEthereumChain(ethereum as unknown as Ethereum, chain);
+    expect(ethereum.request).toHaveBeenCalledWith({
+      method: 'wallet_switchEthereumChain',
+      params: [{ chainId: '0x1' }],
+    });
+  });
+
+  it('should addChain when ethereum thros chain not exist error', async () => {
+    class EthereumError extends Error {
+      code: number;
+      constructor(code) {
+        super();
+        this.code = code;
+      }
+    }
+
+    ethereum.request.mockImplementationOnce(() => {
+      const error = new EthereumError(4902);
+      throw error;
+    });
+
+    await switchEthereumChain(ethereum as unknown as Ethereum, chain);
+    expect(ethereum.request).toHaveBeenCalledWith({
+      method: 'wallet_addEthereumChain',
+      params: [
+        {
+          chainId: ethers.utils.hexValue(chain.id),
+          chainName: chain.name,
+          rpcUrls: [chain.rpc],
+          nativeCurrency: {
+            symbol: 'ETH',
+            decimals: 18,
+            name: 'Ethereum',
+          },
+        },
+      ],
+    });
+  });
+});