test coverage

src/models/MiningJob.spec.ts

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+import * as bitcoinjs from 'bitcoinjs-lib';
+import { BehaviorSubject, firstValueFrom } from 'rxjs';
+
+import { MockRecording1 } from '../../test/models/MockRecording1';
+import { StratumV1JobsService } from '../services/stratum-v1-jobs.service';
+import { MiningJob } from './MiningJob';
+
+describe('MiningJob', () => {
+    let jobTemplate;
+    let job: MiningJob;
+
+    beforeEach(async () => {
+        jest.useFakeTimers();
+        jest.setSystemTime(new Date(parseInt(MockRecording1.TIME, 16) * 1000));
+
+        const blockTemplate$ = new BehaviorSubject(MockRecording1.BLOCK_TEMPLATE);
+        const bitcoinRpcService = {
+            newBlockTemplate$: blockTemplate$.asObservable(),
+            miningInfo: { blocks: MockRecording1.BLOCK_TEMPLATE.height }
+        };
+        jest.spyOn(console, 'log').mockImplementation(() => undefined);
+
+        const jobsService = new StratumV1JobsService(bitcoinRpcService as any);
+        jobTemplate = await firstValueFrom(jobsService.newMiningJob$);
+        job = new MiningJob(
+            bitcoinjs.networks.testnet,
+            '1',
+            [{ address: 'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4', percent: 100 }],
+            jobTemplate
+        );
+    });
+
+    afterEach(() => {
+        jest.restoreAllMocks();
+        jest.useRealTimers();
+    });
+
+    it('should split coinbase around 12 bytes of extranonce space', () => {
+        const notify = JSON.parse(job.response(jobTemplate));
+        const coinbasePart1 = notify.params[2];
+        const coinbasePart2 = notify.params[3];
+        const extraNonce1 = '57a6f098';
+        const extraNonce2 = 'c708000000000000';
+        const coinbase = bitcoinjs.Transaction.fromHex(`${coinbasePart1}${extraNonce1}${extraNonce2}${coinbasePart2}`);
+
+        expect(Buffer.byteLength(extraNonce1 + extraNonce2, 'hex')).toBe(12);
+        expect(coinbase.ins[0].script.toString('hex')).toContain(`${extraNonce1}${extraNonce2}`);
+        expect(coinbase.ins[0].script.toString('hex').endsWith(`${extraNonce1}${extraNonce2}`)).toBe(true);
+    });
+
+    it('should update block nonce, timestamp, version mask, and coinbase script', () => {
+        const extraNonce1 = '57a6f098';
+        const extraNonce2 = 'c708000000000000';
+        const timestamp = parseInt(MockRecording1.TIME, 16);
+        const originalMerkleRoot = Buffer.from(jobTemplate.block.merkleRoot);
+
+        const updatedBlock = job.copyAndUpdateBlock(
+            jobTemplate,
+            parseInt('00002000', 16),
+            parseInt('ed460d91', 16),
+            extraNonce1,
+            extraNonce2,
+            timestamp
+        );
+
+        expect(updatedBlock.nonce).toBe(parseInt('ed460d91', 16));
+        expect(updatedBlock.timestamp).toBe(timestamp);
+        expect(updatedBlock.version).toBe(jobTemplate.block.version ^ parseInt('00002000', 16));
+        expect(updatedBlock.transactions[0].ins[0].script.toString('hex').endsWith(`${extraNonce1}${extraNonce2}`)).toBe(true);
+        expect(updatedBlock.merkleRoot.equals(originalMerkleRoot)).toBe(false);
+    });
+
+    it('should leave block version unchanged without a version mask', () => {
+        const updatedBlock = job.copyAndUpdateBlock(
+            jobTemplate,
+            0,
+            parseInt('ed460d91', 16),
+            '57a6f098',
+            'c708000000000000',
+            parseInt(MockRecording1.TIME, 16)
+        );
+
+        expect(updatedBlock.version).toBe(jobTemplate.block.version);
+    });
+});