Finally mock the eth_call in tests

lib/contracts/handlers/puffer-vault-handler.test.ts

@@ -0,0 +1,51 @@
+import { toHex } from 'viem';
+import { mockRpcRequest } from '../../../test/mocks/mock-request';
+import {
+  setupMockWalletClient,
+  setupMockPublicClient,
+} from '../../../test/mocks/setup-mock-clients';
+import { Chain } from '../../chains/constants';
+import { PufferVaultHandler } from './puffer-vault-handler';
+
+describe('PufferVaultHandler', () => {
+  it('should check pufETH balance', async () => {
+    const mockAddress = '0x8d37d81e29d11cd7557ceaca25e4e4a4255b1159';
+    const mockBalance = BigInt(1);
+    const mockCallHex = toHex(mockBalance, { size: 32 });
+
+    const walletClient = setupMockWalletClient();
+    const publicRequest = mockRpcRequest({ eth_call: mockCallHex });
+    const publicClient = setupMockPublicClient(publicRequest);
+
+    const handler = new PufferVaultHandler(
+      Chain.Anvil,
+      walletClient,
+      publicClient,
+    );
+    const balance = await handler.balanceOf(mockAddress);
+
+    expect(balance).toBe(mockBalance);
+  });
+
+  it('should be able to deposit ETH', async () => {
+    const mockAddress = '0xEB77D02f8122B32273444a1b544C147Fb559CB41';
+    const mockGas = BigInt(1);
+
+    const walletRequest = mockRpcRequest({
+      eth_sendTransaction: mockAddress,
+    });
+    const walletClient = setupMockWalletClient(walletRequest);
+    const publicRequest = mockRpcRequest({ eth_estimateGas: mockGas });
+    const publicClient = setupMockPublicClient(publicRequest);
+
+    const handler = new PufferVaultHandler(
+      Chain.Anvil,
+      walletClient,
+      publicClient,
+    );
+    const { transact, estimate } = handler.depositETH(mockAddress);
+
+    expect(await transact(BigInt(1))).toBe(mockAddress);
+    expect(await estimate()).toBe(mockGas);
+  });
+});