diff --git a/tests/processor.test.ts b/tests/processor.test.ts
new file mode 100644
index 0000000..8898389
--- /dev/null
+++ b/tests/processor.test.ts
@@ -0,0 +1,177 @@
+import { MockInstance, beforeEach, describe, expect, test, vi } from 'vitest';
+import { createProcessor } from '../src/processor';
+
+vi.mock('@subsquid/evm-processor', async () => {
+    const actualMods = await vi.importActual('@subsquid/evm-processor');
+    const EvmBatchProcessor = vi.fn();
+
+    EvmBatchProcessor.prototype.setDataSource = vi.fn().mockReturnThis();
+    EvmBatchProcessor.prototype.setFinalityConfirmation = vi
+        .fn()
+        .mockReturnThis();
+    EvmBatchProcessor.prototype.setFields = vi.fn().mockReturnThis();
+    EvmBatchProcessor.prototype.setBlockRange = vi.fn().mockReturnThis();
+    EvmBatchProcessor.prototype.addLog = vi.fn().mockReturnThis();
+
+    return {
+        ...actualMods!,
+        EvmBatchProcessor,
+    };
+});
+
+const sepolia = 11155111;
+const mainnet = 1;
+const local = 31337;
+
+describe('Processor creation', () => {
+    beforeEach(() => {
+        vi.clearAllMocks();
+    });
+
+    test('Throw error for unsupported chains', () => {
+        try {
+            const processor = createProcessor(999);
+            expect.unreachable('Should not pass createProcessor');
+        } catch (error) {
+            expect(error).toBeInstanceOf(Error);
+            expect(error.message).toEqual('Unsupported chainId: 999');
+        }
+    });
+
+    test('Required configs for sepolia', () => {
+        const processor = createProcessor(sepolia);
+
+        expect(processor.setDataSource).toHaveBeenCalledWith({
+            archive: 'https://v2.archive.subsquid.io/network/ethereum-sepolia',
+            chain: 'https://rpc.ankr.com/eth_sepolia',
+        });
+
+        expect(processor.setFinalityConfirmation).toHaveBeenCalledWith(10);
+        expect(processor.setFields).toHaveBeenCalledWith({
+            transaction: {
+                chainId: true,
+                from: true,
+                hash: true,
+                value: true,
+            },
+        });
+        expect(processor.setBlockRange).toHaveBeenCalledWith({
+            from: 3963384,
+        });
+
+        const addLog = processor.addLog as unknown as MockInstance;
+
+        expect(addLog).toHaveBeenCalledTimes(3);
+        expect(addLog.mock.calls[0][0]).toEqual({
+            address: ['0x7122cd1221c20892234186facfe8615e6743ab02'],
+            topic0: [
+                '0xe73165c2d277daf8713fd08b40845cb6bb7a20b2b543f3d35324a475660fcebd',
+            ],
+        });
+        expect(addLog.mock.calls[1][0]).toEqual({
+            address: ['0x59b22d57d4f067708ab0c00552767405926dc768'],
+            topic0: [
+                '0x6aaa400068bf4ca337265e2a1e1e841f66b8597fd5b452fdc52a44bed28a0784',
+            ],
+            transaction: true,
+        });
+
+        expect(addLog.mock.calls[2][0]).toEqual({
+            topic0: [
+                '0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0',
+            ],
+            transaction: true,
+        });
+    });
+
+    test('Required configs for local/anvil', () => {
+        const processor = createProcessor(local);
+
+        expect(processor.setDataSource).toHaveBeenCalledWith({
+            chain: 'http://127.0.0.1:8545',
+        });
+
+        expect(processor.setFinalityConfirmation).toHaveBeenCalledWith(10);
+        expect(processor.setFields).toHaveBeenCalledWith({
+            transaction: {
+                chainId: true,
+                from: true,
+                hash: true,
+                value: true,
+            },
+        });
+        expect(processor.setBlockRange).toHaveBeenCalledWith({
+            from: 0,
+        });
+
+        const addLog = processor.addLog as unknown as MockInstance;
+
+        expect(addLog).toHaveBeenCalledTimes(3);
+        expect(addLog.mock.calls[0][0]).toEqual({
+            address: ['0x7122cd1221c20892234186facfe8615e6743ab02'],
+            topic0: [
+                '0xe73165c2d277daf8713fd08b40845cb6bb7a20b2b543f3d35324a475660fcebd',
+            ],
+        });
+        expect(addLog.mock.calls[1][0]).toEqual({
+            address: ['0x59b22d57d4f067708ab0c00552767405926dc768'],
+            topic0: [
+                '0x6aaa400068bf4ca337265e2a1e1e841f66b8597fd5b452fdc52a44bed28a0784',
+            ],
+            transaction: true,
+        });
+
+        expect(addLog.mock.calls[2][0]).toEqual({
+            topic0: [
+                '0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0',
+            ],
+            transaction: true,
+        });
+    });
+
+    test('Required configs for mainnet', () => {
+        const processor = createProcessor(mainnet);
+
+        expect(processor.setDataSource).toHaveBeenCalledWith({
+            archive: 'https://v2.archive.subsquid.io/network/ethereum-mainnet',
+            chain: 'https://rpc.ankr.com/eth',
+        });
+
+        expect(processor.setFinalityConfirmation).toHaveBeenCalledWith(10);
+        expect(processor.setFields).toHaveBeenCalledWith({
+            transaction: {
+                chainId: true,
+                from: true,
+                hash: true,
+                value: true,
+            },
+        });
+        expect(processor.setBlockRange).toHaveBeenCalledWith({
+            from: 17784733,
+        });
+
+        const addLog = processor.addLog as unknown as MockInstance;
+
+        expect(addLog).toHaveBeenCalledTimes(3);
+        expect(addLog.mock.calls[0][0]).toEqual({
+            address: ['0x7122cd1221c20892234186facfe8615e6743ab02'],
+            topic0: [
+                '0xe73165c2d277daf8713fd08b40845cb6bb7a20b2b543f3d35324a475660fcebd',
+            ],
+        });
+        expect(addLog.mock.calls[1][0]).toEqual({
+            address: ['0x59b22d57d4f067708ab0c00552767405926dc768'],
+            topic0: [
+                '0x6aaa400068bf4ca337265e2a1e1e841f66b8597fd5b452fdc52a44bed28a0784',
+            ],
+            transaction: true,
+        });
+
+        expect(addLog.mock.calls[2][0]).toEqual({
+            topic0: [
+                '0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0',
+            ],
+            transaction: true,
+        });
+    });
+});