reorg code, integration publish/subscribe working, still some TODOs

blockchain/blockchain.test.js

@@ -0,0 +1,55 @@
+const Blockchain = require('./index');
+const Block = require('./block');
+
+describe('Blockchain', () => {
+  let bc, bc2;
+
+  beforeEach(() => {
+    bc = new Blockchain();
+    bc2 = new Blockchain();
+  });
+
+  it('starts with genesis block', () => {
+    expect(bc.chain[0]).toEqual(Block.genesis());
+  });
+
+  it('adds a new block', () => {
+    const reward = 'test-reward-key';
+    expect(bc.addBlock(Block.debugMine(bc.lastBlock(),reward,[],[]))).toBe(true);
+
+    expect(bc.lastBlock().reward).toEqual(reward);
+  });
+
+  it('validates a valid chain', () => {
+    expect(bc2.addBlock(Block.debugMine(bc2.lastBlock(), 'test-reward-key', [], []))).toBe(true);
+
+    expect(Blockchain.isValidChain(bc2.chain)).toBe(true);
+  });
+
+  it('invalidates a chain with a corrupt genesis block', () => {
+    bc2.chain[0].hash = 'Bad data';
+
+    expect(Blockchain.isValidChain(bc2.chain)).toBe(false);
+  });
+
+  it('invalidates a corrupt chain', () => {
+    expect(bc2.addBlock(Block.debugMine(bc2.lastBlock(), 'test-reward-key', [], []))).toBe(true);
+    bc2.chain[1].reward = 'Not foo';
+
+    expect(Blockchain.isValidChain(bc2.chain)).toBe(false);
+  });
+
+  it('replaces the chain with a valid chain', () => {
+    expect(bc2.addBlock(Block.debugMine(bc2.lastBlock(), 'test-reward-key', [], []))).toBe(true);
+    expect(bc.replaceChain(bc2.chain).result).toBe(true);
+
+    expect(bc.chain).toEqual(bc2.chain);
+  });
+
+  it('does not replace the chain with one of less than or equal to length', () => {
+    expect(bc.addBlock(Block.debugMine(bc.lastBlock(), 'test-reward-key', [], []))).toBe(true);
+    expect(bc.replaceChain(bc2.chain).result).toBe(false);
+
+    expect(bc.chain).not.toEqual(bc2.chain);
+  })
+});