block.test.js

const { GENESIS_DATA } = require('./config');
const Block = require('./block');
const cryptoHash = require('./crypto-hash');
describe('Block', () => {
const timestamp = 'a-date';
const lastHash = 'foo-hash';
const hash = 'bar-hash';
const data = ['blockchain','data'];
const block = new Block({ timestamp, lastHash, hash, data });

it('has a timestamp, lastHash, has and data property', () => {
    expect(block.timestamp).toEqual(timestamp);
    expect(block.lastHash).toEqual(lastHash);
    expect(block.hash).toEqual(hash);
    expect(block.data).toEqual(data); 
    });

describe ('genesis()', () => {
    const genesisBlock = Block.genesis();
    console.log('genesisBlock',genesisBlock);
    it ('returns a Block instance', () => {
        expect(genesisBlock instanceof Block).toBe(true);
    });

    it('returns the genesis data', () => {
        expect(genesisBlock).toEqual(GENESIS_DATA);
    });
    });

describe ('mineBlock()',() => {
    const lastBlock = Block.genesis();
    const data = 'mined data';
    const minedBlock = Block.minedBlock({ lastBlock,data}); 
    it('returns a Block instance', () => {
expect (minedBlock instanceof Block).toBe(true);
    });
    it('sets the "lastHash" to be the "hash" of the lastBlock', () => {
        expect(minedBlock.lastHash).toEqual(lastBlock.hash);
        });
        it('sets the "data" ', () => {
            expect(minedBlock.data).not.toEqual(undefined);
            });
    it('sets the "timestamp" ', () => {
        expect(minedBlock.timestamp).not.toEqual(undefined);
        });
    it('create a SHA-256 "hash" based on the proper inputs', () => {
        expect(minedBlock.hash).toEqual(cryptoHash(minedBlock.timestamp,lastBlock.hash,data));
    });
    
});


});