v6 initial commit, maybe more to follow

wallet/transaction.test.js

@@ -0,0 +1,79 @@
+const Transaction = require('./Cointransaction');
+const Wallet = require('./index');
+const { MINING_REWARD } = require('../config');
+
+describe('Transaction', () => {
+  let transaction, wallet, recipient, amount;
+
+  beforeEach(() => {
+    wallet = new Wallet();
+    amount = 50;
+    recipient = 'r3c1p13nt';
+    transaction = Transaction.newTransaction(wallet, recipient, amount);
+  });
+
+  it('outputs the `amount` subtracted from the wallet balance', () => {
+    expect(transaction.outputs.find(output => output.address === wallet.publicKey).amount)
+      .toEqual(wallet.balance - amount);
+  });
+
+  it('outputs the `amount` added to the recipient', () => {
+    expect(transaction.outputs.find(output => output.address === recipient).amount)
+      .toEqual(amount);
+  });
+
+  it('inputs the balance of the wallet', () => {
+    expect(transaction.input.amount).toEqual(wallet.balance);
+  });
+
+  it('validates a valid transaction', () => {
+    expect(Transaction.verifyTransaction(transaction)).toBe(true);
+  });
+
+  it('invalidates a corrupt transaction', () => {
+    transaction.outputs[0].amount = 50000;
+    expect(Transaction.verifyTransaction(transaction)).toBe(false);
+  });
+
+  describe('transacting with an amount that exceeds the balance', () => {
+    beforeEach(() => {
+      amount = 50000;
+      transaction = Transaction.newTransaction(wallet, recipient, amount);
+    });
+
+    it('does not create the transaction', () => {
+      expect(transaction).toEqual(undefined);
+    });
+  });
+
+  describe('and updating a transaction', () => {
+    let nextAmount, nextRecipient;
+
+    beforeEach(() => {
+      nextAmount = 20;
+      nextRecipient = 'n3xt-4ddr355';
+      transaction = transaction.update(wallet, nextRecipient, nextAmount);
+    });
+
+    it(`subtracts the next amount from the sender's output`, () => {
+      expect(transaction.outputs.find(output => output.address === wallet.publicKey).amount)
+        .toEqual(wallet.balance - amount - nextAmount);
+    });
+
+    it('outputs an amount for the next recipient', () => {
+      expect(transaction.outputs.find(output => output.address === nextRecipient).amount)
+        .toEqual(nextAmount);
+    });
+  });
+
+  describe('creating a reward transaction', () => {
+    beforeEach(() => {
+      transaction = Transaction.rewardTransaction(wallet, Wallet.blockchainWallet());
+    });
+
+    it(`reward the miner's wallet`, () => {
+      expect(transaction.outputs.find(output => output.address === wallet.publicKey).amount)
+        .toEqual(MINING_REWARD);
+    });
+  });
+});