Create BlockchainService.test.js

pi-nexus-blockchain/tests/unit/BlockchainService.test.js

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+import { BlockchainService } from '../../src/services/BlockchainService';
+import { BlockchainModel } from '../../src/models/BlockchainModel';
+import sinon from 'sinon';
+import { expect } from 'chai';
+
+describe('BlockchainService', () => {
+  let blockchainService;
+  let blockchainModelStub;
+
+  beforeEach(() => {
+    blockchainModelStub = sinon.stub(BlockchainModel, 'findOne');
+    blockchainService = new BlockchainService();
+  });
+
+  afterEach(() => {
+    blockchainModelStub.restore();
+  });
+
+  it('should get blockchain by networkId', async () => {
+    const networkId = 'mainnet';
+    const blockchain = { id: 1, networkId, chainId: '1' };
+    blockchainModelStub.resolves(blockchain);
+
+    const result = await blockchainService.getBlockchainByNetworkId(networkId);
+    expect(result).to.deep.equal(blockchain);
+  });
+
+  it('should update blockchain block number', async () => {
+    const blockchain = { id: 1, networkId: 'mainnet', chainId: '1', blockNumber: 100 };
+    blockchainModelStub.resolves(blockchain);
+
+    const newBlockNumber = 150;
+    await blockchainService.updateBlockchainBlockNumber(blockchain.id, newBlockNumber);
+    expect(blockchain.blockNumber).to.equal(newBlockNumber);
+  });
+});