From 17884e91a1cf9b3f243fe6e3fcd7141f700cec6e Mon Sep 17 00:00:00 2001
From: Facundo Spagnuolo <facundo_spagnuolo@icloud.com>
Date: Tue, 9 Jan 2018 12:25:50 -0300
Subject: [PATCH] Emit Trasnfer event on SimpleToken creation

---
 contracts/examples/SimpleToken.sol |  1 +
 test/SimpleToken.test.js           | 41 ++++++++++++++++++++++++++++++
 test/helpers/decodeLogs.js         |  8 ++++++
 3 files changed, 50 insertions(+)
 create mode 100644 test/SimpleToken.test.js
 create mode 100644 test/helpers/decodeLogs.js

diff --git a/contracts/examples/SimpleToken.sol b/contracts/examples/SimpleToken.sol
index 51edf0873..f7cf62413 100644
--- a/contracts/examples/SimpleToken.sol
+++ b/contracts/examples/SimpleToken.sol
@@ -24,6 +24,7 @@ contract SimpleToken is StandardToken {
   function SimpleToken() public {
     totalSupply = INITIAL_SUPPLY;
     balances[msg.sender] = INITIAL_SUPPLY;
+    Transfer(0x0, msg.sender, INITIAL_SUPPLY);
   }
 
 }
diff --git a/test/SimpleToken.test.js b/test/SimpleToken.test.js
new file mode 100644
index 000000000..9a1870f20
--- /dev/null
+++ b/test/SimpleToken.test.js
@@ -0,0 +1,41 @@
+import decodeLogs from './helpers/decodeLogs';
+const SimpleToken = artifacts.require('examples/SimpleToken.sol');
+
+contract('SimpleToken', accounts => {
+  let token;
+  const creator = accounts[0];
+
+  beforeEach(async function () {
+    token = await SimpleToken.new({ from: creator });
+  });
+
+  it('has a name', async function () {
+    const name = await token.name();
+    assert.equal(name, 'SimpleToken');
+  });
+
+  it('has a symbol', async function () {
+    const symbol = await token.symbol();
+    assert.equal(symbol, 'SIM');
+  });
+
+  it('has 18 decimals', async function () {
+    const decimals = await token.decimals();
+    assert(decimals.eq(18));
+  });
+  
+  it('assigns the initial total supply to the creator', async function () {
+    const totalSupply = await token.totalSupply();
+    const creatorBalance = await token.balanceOf(creator);
+
+    assert(creatorBalance.eq(totalSupply));
+
+    const receipt = web3.eth.getTransactionReceipt(token.transactionHash);
+    const logs = decodeLogs(receipt.logs, SimpleToken, token.address);
+    assert.equal(logs.length, 1);
+    assert.equal(logs[0].event, 'Transfer');
+    assert.equal(logs[0].args.from.valueOf(), 0x0);
+    assert.equal(logs[0].args.to.valueOf(), creator);
+    assert(logs[0].args.value.eq(totalSupply));
+  });
+});
diff --git a/test/helpers/decodeLogs.js b/test/helpers/decodeLogs.js
new file mode 100644
index 000000000..c990eedcb
--- /dev/null
+++ b/test/helpers/decodeLogs.js
@@ -0,0 +1,8 @@
+const SolidityEvent = require('web3/lib/web3/event.js');
+
+export default function decodeLogs (logs, contract, address) {
+  return logs.map(log => {
+    const event = new SolidityEvent(null, contract.events[log.topics[0]], address);
+    return event.decode(log);
+  });
+}