diff --git a/README.md b/README.md
index 0cae1a74552..b9deaddfa2c 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ mkdir myproject && cd myproject
 truffle init
 ```
 
-To install the OpenZeppelin library, run:
+To install the OpenZeppelin library, run the following in your Solidity project root directory:
 ```sh
 npm init
 npm install zeppelin-solidity
diff --git a/contracts/lifecycle/TokenDestructible.sol b/contracts/lifecycle/TokenDestructible.sol
index 0bca30e7b82..131e57a5797 100644
--- a/contracts/lifecycle/TokenDestructible.sol
+++ b/contracts/lifecycle/TokenDestructible.sol
@@ -1,7 +1,7 @@
 pragma solidity ^0.4.18;
 
 import "../ownership/Ownable.sol";
-import "../token/ERC20Basic.sol";
+import "../token/ERC20/ERC20Basic.sol";
 
 
 /**
diff --git a/contracts/mocks/DetailedERC20Mock.sol b/contracts/mocks/DetailedERC20Mock.sol
index 83fc96b3802..81aca044afe 100644
--- a/contracts/mocks/DetailedERC20Mock.sol
+++ b/contracts/mocks/DetailedERC20Mock.sol
@@ -1,7 +1,7 @@
 pragma solidity ^0.4.18;
 
 import "../token/StandardToken.sol";
-import "../token/DetailedERC20.sol";
+import "../token/ERC20/DetailedERC20.sol";
 
 
 contract DetailedERC20Mock is StandardToken, DetailedERC20 {
diff --git a/contracts/mocks/ERC23TokenMock.sol b/contracts/mocks/ERC223TokenMock.sol
similarity index 57%
rename from contracts/mocks/ERC23TokenMock.sol
rename to contracts/mocks/ERC223TokenMock.sol
index d785a72d987..259faf2ab87 100644
--- a/contracts/mocks/ERC23TokenMock.sol
+++ b/contracts/mocks/ERC223TokenMock.sol
@@ -4,20 +4,19 @@ pragma solidity ^0.4.18;
 import "../token/BasicToken.sol";
 
 
-contract ERC23ContractInterface {
+contract ERC223ContractInterface {
   function tokenFallback(address _from, uint256 _value, bytes _data) external;
 }
 
+contract ERC223TokenMock is BasicToken {
 
-contract ERC23TokenMock is BasicToken {
-
-  function ERC23TokenMock(address initialAccount, uint256 initialBalance) public {
+  function ERC223TokenMock(address initialAccount, uint256 initialBalance) public {
     balances[initialAccount] = initialBalance;
     totalSupply = initialBalance;
   }
 
-  // ERC23 compatible transfer function (except the name)
-  function transferERC23(address _to, uint256 _value, bytes _data) public
+  // ERC223 compatible transfer function (except the name)
+  function transferERC223(address _to, uint256 _value, bytes _data) public
     returns (bool success)
   {
     transfer(_to, _value);
@@ -26,7 +25,7 @@ contract ERC23TokenMock is BasicToken {
       is_contract := not(iszero(extcodesize(_to)))
     }
     if (is_contract) {
-      ERC23ContractInterface receiver = ERC23ContractInterface(_to);
+      ERC223ContractInterface receiver = ERC223ContractInterface(_to);
       receiver.tokenFallback(msg.sender, _value, _data);
     }
     return true;
diff --git a/contracts/mocks/ERC827TokenMock.sol b/contracts/mocks/ERC827TokenMock.sol
new file mode 100644
index 00000000000..9ac16cc6399
--- /dev/null
+++ b/contracts/mocks/ERC827TokenMock.sol
@@ -0,0 +1,15 @@
+pragma solidity ^0.4.13;
+
+
+import "../token/ERC827/ERC827Token.sol";
+
+
+// mock class using ERC827 Token
+contract ERC827TokenMock is ERC827Token {
+
+  function ERC827TokenMock(address initialAccount, uint256 initialBalance) public {
+    balances[initialAccount] = initialBalance;
+    totalSupply = initialBalance;
+  }
+
+}
diff --git a/contracts/mocks/MessageHelper.sol b/contracts/mocks/MessageHelper.sol
new file mode 100644
index 00000000000..f990241dab0
--- /dev/null
+++ b/contracts/mocks/MessageHelper.sol
@@ -0,0 +1,23 @@
+pragma solidity ^0.4.11;
+
+contract MessageHelper {
+
+  event Show(bytes32 b32, uint256 number, string text);
+
+  function showMessage( bytes32 message, uint256 number, string text ) public returns (bool) {
+    Show(message, number, text);
+    return true;
+  }
+
+  function fail() public {
+    require(false);
+  }
+
+  function call(address to, bytes data) public returns (bool) {
+    if (to.call(data))
+      return true;
+    else
+      return false;
+  }
+
+}
diff --git a/contracts/mocks/SafeERC20Helper.sol b/contracts/mocks/SafeERC20Helper.sol
index d41e7a5e1aa..1a9bcdfc2ba 100644
--- a/contracts/mocks/SafeERC20Helper.sol
+++ b/contracts/mocks/SafeERC20Helper.sol
@@ -1,7 +1,7 @@
 pragma solidity ^0.4.18;
 
-import "../token/ERC20.sol";
-import "../token/SafeERC20.sol";
+import "../token/ERC20/ERC20.sol";
+import "../token/ERC20/SafeERC20.sol";
 
 
 contract ERC20FailingMock is ERC20 {
diff --git a/contracts/ownership/CanReclaimToken.sol b/contracts/ownership/CanReclaimToken.sol
index ab85e173652..69fb95c6e21 100644
--- a/contracts/ownership/CanReclaimToken.sol
+++ b/contracts/ownership/CanReclaimToken.sol
@@ -1,8 +1,8 @@
 pragma solidity ^0.4.18;
 
 import "./Ownable.sol";
-import "../token/ERC20Basic.sol";
-import "../token/SafeERC20.sol";
+import "../token/ERC20/ERC20Basic.sol";
+import "../token/ERC20/SafeERC20.sol";
 
 
 /**
diff --git a/contracts/ownership/HasNoTokens.sol b/contracts/ownership/HasNoTokens.sol
index 9a4e7aabe67..ee9531bb7c6 100644
--- a/contracts/ownership/HasNoTokens.sol
+++ b/contracts/ownership/HasNoTokens.sol
@@ -6,14 +6,14 @@ import "./CanReclaimToken.sol";
 /**
  * @title Contracts that should not own Tokens
  * @author Remco Bloemen <remco@2π.com>
- * @dev This blocks incoming ERC23 tokens to prevent accidental loss of tokens.
+ * @dev This blocks incoming ERC223 tokens to prevent accidental loss of tokens.
  * Should tokens (any ERC20Basic compatible) end up in the contract, it allows the
  * owner to reclaim the tokens.
  */
 contract HasNoTokens is CanReclaimToken {
 
  /**
-  * @dev Reject all ERC23 compatible tokens
+  * @dev Reject all ERC223 compatible tokens
   * @param from_ address The address that is transferring the tokens
   * @param value_ uint256 the amount of the specified token
   * @param data_ Bytes The data passed from the caller.
diff --git a/contracts/token/BasicToken.sol b/contracts/token/BasicToken.sol
index 469fedbccaf..46e8bf87016 100644
--- a/contracts/token/BasicToken.sol
+++ b/contracts/token/BasicToken.sol
@@ -1,7 +1,7 @@
 pragma solidity ^0.4.18;
 
 
-import "./ERC20Basic.sol";
+import "./ERC20/ERC20Basic.sol";
 import "../math/SafeMath.sol";
 
 
diff --git a/contracts/token/DetailedERC20.sol b/contracts/token/ERC20/DetailedERC20.sol
similarity index 100%
rename from contracts/token/DetailedERC20.sol
rename to contracts/token/ERC20/DetailedERC20.sol
diff --git a/contracts/token/ERC20.sol b/contracts/token/ERC20/ERC20.sol
similarity index 100%
rename from contracts/token/ERC20.sol
rename to contracts/token/ERC20/ERC20.sol
diff --git a/contracts/token/ERC20Basic.sol b/contracts/token/ERC20/ERC20Basic.sol
similarity index 100%
rename from contracts/token/ERC20Basic.sol
rename to contracts/token/ERC20/ERC20Basic.sol
diff --git a/contracts/token/SafeERC20.sol b/contracts/token/ERC20/SafeERC20.sol
similarity index 100%
rename from contracts/token/SafeERC20.sol
rename to contracts/token/ERC20/SafeERC20.sol
diff --git a/contracts/token/ERC827/ERC827.sol b/contracts/token/ERC827/ERC827.sol
new file mode 100644
index 00000000000..31a17cd809f
--- /dev/null
+++ b/contracts/token/ERC827/ERC827.sol
@@ -0,0 +1,20 @@
+pragma solidity ^0.4.13;
+
+
+import "../ERC20/ERC20.sol";
+
+
+/**
+   @title ERC827 interface, an extension of ERC20 token standard
+
+   Interface of a ERC827 token, following the ERC20 standard with extra
+   methods to transfer value and data and execute calls in transfers and
+   approvals.
+ */
+contract ERC827 is ERC20 {
+
+  function approve( address _spender, uint256 _value, bytes _data ) public returns (bool);
+  function transfer( address _to, uint256 _value, bytes _data ) public returns (bool);
+  function transferFrom( address _from, address _to, uint256 _value, bytes _data ) public returns (bool);
+
+}
diff --git a/contracts/token/ERC827/ERC827Token.sol b/contracts/token/ERC827/ERC827Token.sol
new file mode 100644
index 00000000000..f027c80ff3d
--- /dev/null
+++ b/contracts/token/ERC827/ERC827Token.sol
@@ -0,0 +1,126 @@
+pragma solidity ^0.4.13;
+
+import "./ERC827.sol";
+import "../StandardToken.sol";
+
+/**
+   @title ERC827, an extension of ERC20 token standard
+
+   Implementation the ERC827, following the ERC20 standard with extra
+   methods to transfer value and data and execute calls in transfers and
+   approvals.
+   Uses OpenZeppelin StandardToken.
+ */
+contract ERC827Token is ERC827, StandardToken {
+
+  /**
+     @dev Addition to ERC20 token methods. It allows to
+     approve the transfer of value and execute a call with the sent data.
+
+     Beware that changing an allowance with this method brings the risk that
+     someone may use both the old and the new allowance by unfortunate
+     transaction ordering. One possible solution to mitigate this race condition
+     is to first reduce the spender's allowance to 0 and set the desired value
+     afterwards:
+     https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
+
+     @param _spender The address that will spend the funds.
+     @param _value The amount of tokens to be spent.
+     @param _data ABI-encoded contract call to call `_to` address.
+
+     @return true if the call function was executed successfully
+   */
+  function approve(address _spender, uint256 _value, bytes _data) public returns (bool) {
+    require(_spender != address(this));
+
+    super.approve(_spender, _value);
+
+    require(_spender.call(_data));
+
+    return true;
+  }
+
+  /**
+     @dev Addition to ERC20 token methods. Transfer tokens to a specified
+     address and execute a call with the sent data on the same transaction
+
+     @param _to address The address which you want to transfer to
+     @param _value uint256 the amout of tokens to be transfered
+     @param _data ABI-encoded contract call to call `_to` address.
+
+     @return true if the call function was executed successfully
+   */
+  function transfer(address _to, uint256 _value, bytes _data) public returns (bool) {
+    require(_to != address(this));
+
+    super.transfer(_to, _value);
+
+    require(_to.call(_data));
+    return true;
+  }
+
+  /**
+     @dev Addition to ERC20 token methods. Transfer tokens from one address to
+     another and make a contract call on the same transaction
+
+     @param _from The address which you want to send tokens from
+     @param _to The address which you want to transfer to
+     @param _value The amout of tokens to be transferred
+     @param _data ABI-encoded contract call to call `_to` address.
+
+     @return true if the call function was executed successfully
+   */
+  function transferFrom(address _from, address _to, uint256 _value, bytes _data) public returns (bool) {
+    require(_to != address(this));
+
+    super.transferFrom(_from, _to, _value);
+
+    require(_to.call(_data));
+    return true;
+  }
+
+  /**
+   * @dev Addition to StandardToken methods. Increase the amount of tokens that
+   * an owner allowed to a spender and execute a call with the sent data.
+   *
+   * approve should be called when allowed[_spender] == 0. To increment
+   * allowed value is better to use this function to avoid 2 calls (and wait until
+   * the first transaction is mined)
+   * From MonolithDAO Token.sol
+   * @param _spender The address which will spend the funds.
+   * @param _addedValue The amount of tokens to increase the allowance by.
+   * @param _data ABI-encoded contract call to call `_spender` address.
+   */
+  function increaseApproval(address _spender, uint _addedValue, bytes _data) public returns (bool) {
+    require(_spender != address(this));
+
+    super.increaseApproval(_spender, _addedValue);
+
+    require(_spender.call(_data));
+
+    return true;
+  }
+
+  /**
+   * @dev Addition to StandardToken methods. Decrease the amount of tokens that
+   * an owner allowed to a spender and execute a call with the sent data.
+   *
+   * approve should be called when allowed[_spender] == 0. To decrement
+   * allowed value is better to use this function to avoid 2 calls (and wait until
+   * the first transaction is mined)
+   * From MonolithDAO Token.sol
+   * @param _spender The address which will spend the funds.
+   * @param _subtractedValue The amount of tokens to decrease the allowance by.
+   * @param _data ABI-encoded contract call to call `_spender` address.
+   */
+  function decreaseApproval(address _spender, uint _subtractedValue, bytes _data) public returns (bool) {
+    require(_spender != address(this));
+
+    super.decreaseApproval(_spender, _subtractedValue);
+
+    require(_spender.call(_data));
+
+    return true;
+  }
+
+}
diff --git a/contracts/token/StandardToken.sol b/contracts/token/StandardToken.sol
index 1aa10d3f912..a3a1c34457a 100644
--- a/contracts/token/StandardToken.sol
+++ b/contracts/token/StandardToken.sol
@@ -2,7 +2,7 @@ pragma solidity ^0.4.18;
 
 
 import "./BasicToken.sol";
-import "./ERC20.sol";
+import "./ERC20/ERC20.sol";
 
 
 /**
diff --git a/contracts/token/TokenTimelock.sol b/contracts/token/TokenTimelock.sol
index 3fd0103a518..2562b094018 100644
--- a/contracts/token/TokenTimelock.sol
+++ b/contracts/token/TokenTimelock.sol
@@ -1,7 +1,6 @@
 pragma solidity ^0.4.18;
 
-import "./ERC20Basic.sol";
-import "../token/SafeERC20.sol";
+import "./ERC20/SafeERC20.sol";
 
 
 /**
diff --git a/contracts/token/TokenVesting.sol b/contracts/token/TokenVesting.sol
index 01bdff34e7c..a8b45c01e25 100644
--- a/contracts/token/TokenVesting.sol
+++ b/contracts/token/TokenVesting.sol
@@ -1,7 +1,7 @@
 pragma solidity ^0.4.18;
 
-import "./ERC20Basic.sol";
-import "./SafeERC20.sol";
+import "./ERC20/ERC20Basic.sol";
+import "./ERC20/SafeERC20.sol";
 import "../ownership/Ownable.sol";
 import "../math/SafeMath.sol";
 
diff --git a/package.json b/package.json
index f15f6397b2b..6d93e41e1c5 100644
--- a/package.json
+++ b/package.json
@@ -56,6 +56,7 @@
     "truffle-hdwallet-provider": "0.0.3"
   },
   "dependencies": {
-    "dotenv": "^4.0.0"
+    "dotenv": "^4.0.0",
+    "ethjs-abi": "^0.2.1"
   }
 }
diff --git a/test/SimpleToken.test.js b/test/examples/SimpleToken.test.js
similarity index 90%
rename from test/SimpleToken.test.js
rename to test/examples/SimpleToken.test.js
index 9a1870f2047..8d4c330918e 100644
--- a/test/SimpleToken.test.js
+++ b/test/examples/SimpleToken.test.js
@@ -1,5 +1,5 @@
-import decodeLogs from './helpers/decodeLogs';
-const SimpleToken = artifacts.require('examples/SimpleToken.sol');
+import decodeLogs from '../helpers/decodeLogs';
+const SimpleToken = artifacts.require('SimpleToken.sol');
 
 contract('SimpleToken', accounts => {
   let token;
@@ -23,7 +23,7 @@ contract('SimpleToken', accounts => {
     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);
diff --git a/test/ECRecovery.test.js b/test/library/ECRecovery.test.js
similarity index 92%
rename from test/ECRecovery.test.js
rename to test/library/ECRecovery.test.js
index 927441f4bc7..ae69f42cf46 100644
--- a/test/ECRecovery.test.js
+++ b/test/library/ECRecovery.test.js
@@ -1,7 +1,7 @@
-var ECRecoveryMock = artifacts.require('../contracts/mocks/ECRecoveryMock.sol');
-var ECRecoveryLib = artifacts.require('../contracts/ECRecovery.sol');
+var ECRecoveryMock = artifacts.require('ECRecoveryMock.sol');
+var ECRecoveryLib = artifacts.require('ECRecovery.sol');
 
-var hashMessage = require('./helpers/hashMessage.js');
+var hashMessage = require('../helpers/hashMessage.js');
 
 contract('ECRecovery', function (accounts) {
   let ecrecovery;
diff --git a/test/Math.test.js b/test/library/Math.test.js
similarity index 89%
rename from test/Math.test.js
rename to test/library/Math.test.js
index 7378610b61c..b112646a0f8 100644
--- a/test/Math.test.js
+++ b/test/library/Math.test.js
@@ -1,4 +1,4 @@
-var MathMock = artifacts.require('./mocks/MathMock.sol');
+var MathMock = artifacts.require('../mocks/MathMock.sol');
 
 contract('Math', function (accounts) {
   let math;
diff --git a/test/MerkleProof.test.js b/test/library/MerkleProof.test.js
similarity index 94%
rename from test/MerkleProof.test.js
rename to test/library/MerkleProof.test.js
index f55d6ebc8b5..9d464401f5a 100644
--- a/test/MerkleProof.test.js
+++ b/test/library/MerkleProof.test.js
@@ -1,8 +1,8 @@
 
-import MerkleTree from './helpers/merkleTree.js';
+import MerkleTree from '../helpers/merkleTree.js';
 import { sha3, bufferToHex } from 'ethereumjs-util';
 
-var MerkleProof = artifacts.require('./MerkleProof.sol');
+var MerkleProof = artifacts.require('MerkleProof.sol');
 
 contract('MerkleProof', function (accounts) {
   let merkleProof;
diff --git a/test/ownership/HasNoTokens.test.js b/test/ownership/HasNoTokens.test.js
index e6622a16dff..ac3690fd37e 100644
--- a/test/ownership/HasNoTokens.test.js
+++ b/test/ownership/HasNoTokens.test.js
@@ -2,7 +2,7 @@
 import expectThrow from '../helpers/expectThrow';
 
 const HasNoTokens = artifacts.require('../contracts/lifecycle/HasNoTokens.sol');
-const ERC23TokenMock = artifacts.require('mocks/ERC23TokenMock.sol');
+const ERC223TokenMock = artifacts.require('mocks/ERC223TokenMock.sol');
 
 contract('HasNoTokens', function (accounts) {
   let hasNoTokens = null;
@@ -11,7 +11,7 @@ contract('HasNoTokens', function (accounts) {
   beforeEach(async () => {
     // Create contract and token
     hasNoTokens = await HasNoTokens.new();
-    token = await ERC23TokenMock.new(accounts[0], 100);
+    token = await ERC223TokenMock.new(accounts[0], 100);
 
     // Force token into contract
     await token.transfer(hasNoTokens.address, 10);
@@ -19,8 +19,8 @@ contract('HasNoTokens', function (accounts) {
     assert.equal(startBalance, 10);
   });
 
-  it('should not accept ERC23 tokens', async function () {
-    await expectThrow(token.transferERC23(hasNoTokens.address, 10, ''));
+  it('should not accept ERC223 tokens', async function () {
+    await expectThrow(token.transferERC223(hasNoTokens.address, 10, ''));
   });
 
   it('should allow owner to reclaim tokens', async function () {
diff --git a/test/token/DetailedERC20.test.js b/test/token/ERC20/DetailedERC20.test.js
similarity index 91%
rename from test/token/DetailedERC20.test.js
rename to test/token/ERC20/DetailedERC20.test.js
index 16155a4b87b..cfb1d1e714f 100644
--- a/test/token/DetailedERC20.test.js
+++ b/test/token/ERC20/DetailedERC20.test.js
@@ -5,7 +5,7 @@ require('chai')
   .use(require('chai-bignumber')(BigNumber))
   .should();
 
-const DetailedERC20Mock = artifacts.require('mocks/DetailedERC20Mock.sol');
+const DetailedERC20Mock = artifacts.require('DetailedERC20Mock.sol');
 
 contract('DetailedERC20', accounts => {
   let detailedERC20 = null;
diff --git a/test/token/SafeERC20.test.js b/test/token/ERC20/SafeERC20.test.js
similarity index 90%
rename from test/token/SafeERC20.test.js
rename to test/token/ERC20/SafeERC20.test.js
index 0602e08ffba..40a43e1a749 100644
--- a/test/token/SafeERC20.test.js
+++ b/test/token/ERC20/SafeERC20.test.js
@@ -1,10 +1,10 @@
-import EVMThrow from '../helpers/EVMThrow';
+import EVMThrow from '../../helpers/EVMThrow';
 
 require('chai')
   .use(require('chai-as-promised'))
   .should();
 
-const SafeERC20Helper = artifacts.require('mocks/SafeERC20Helper.sol');
+const SafeERC20Helper = artifacts.require('SafeERC20Helper.sol');
 
 contract('SafeERC20', function () {
   beforeEach(async function () {
diff --git a/test/token/ERC827/ERC827Token.js b/test/token/ERC827/ERC827Token.js
new file mode 100644
index 00000000000..302cca7dd95
--- /dev/null
+++ b/test/token/ERC827/ERC827Token.js
@@ -0,0 +1,374 @@
+
+import EVMRevert from '../../helpers/EVMRevert';
+var Message = artifacts.require('MessageHelper.sol');
+var ERC827TokenMock = artifacts.require('ERC827TokenMock.sol');
+
+var BigNumber = web3.BigNumber;
+var _ = require('lodash');
+var ethjsABI = require('ethjs-abi');
+require('chai')
+  .use(require('chai-as-promised'))
+  .use(require('chai-bignumber')(BigNumber))
+  .should();
+
+contract('ERC827 Token', function (accounts) {
+  let token;
+
+  function findMethod (abi, name, args) {
+    for (var i = 0; i < abi.length; i++) {
+      const methodArgs = _.map(abi[i].inputs, 'type').join(',');
+      if ((abi[i].name === name) && (methodArgs === args)) {
+        return abi[i];
+      }
+    }
+  }
+
+  beforeEach(async function () {
+    token = await ERC827TokenMock.new(accounts[0], 100);
+  });
+
+  it('should return the correct totalSupply after construction', async function () {
+    let totalSupply = await token.totalSupply();
+
+    assert.equal(totalSupply, 100);
+  });
+
+  it('should return the correct allowance amount after approval', async function () {
+    let token = await ERC827TokenMock.new();
+    await token.approve(accounts[1], 100);
+    let allowance = await token.allowance(accounts[0], accounts[1]);
+
+    assert.equal(allowance, 100);
+  });
+
+  it('should return correct balances after transfer', async function () {
+    await token.transfer(accounts[1], 100);
+    let balance0 = await token.balanceOf(accounts[0]);
+    assert.equal(balance0, 0);
+
+    let balance1 = await token.balanceOf(accounts[1]);
+    assert.equal(balance1, 100);
+  });
+
+  it('should throw an error when trying to transfer more than balance', async function () {
+    await token.transfer(accounts[1], 101).should.be.rejectedWith(EVMRevert);
+  });
+
+  it('should return correct balances after transfering from another account', async function () {
+    await token.approve(accounts[1], 100);
+    await token.transferFrom(accounts[0], accounts[2], 100, { from: accounts[1] });
+
+    let balance0 = await token.balanceOf(accounts[0]);
+    assert.equal(balance0, 0);
+
+    let balance1 = await token.balanceOf(accounts[2]);
+    assert.equal(balance1, 100);
+
+    let balance2 = await token.balanceOf(accounts[1]);
+    assert.equal(balance2, 0);
+  });
+
+  it('should throw an error when trying to transfer more than allowed', async function () {
+    await token.approve(accounts[1], 99);
+    await token.transferFrom(
+      accounts[0], accounts[2], 100,
+      { from: accounts[1] }
+    ).should.be.rejectedWith(EVMRevert);
+  });
+
+  it('should throw an error when trying to transferFrom more than _from has', async function () {
+    let balance0 = await token.balanceOf(accounts[0]);
+    await token.approve(accounts[1], 99);
+    await token.transferFrom(
+      accounts[0], accounts[2], balance0 + 1,
+      { from: accounts[1] }
+    ).should.be.rejectedWith(EVMRevert);
+  });
+
+  describe('validating allowance updates to spender', function () {
+    let preApproved;
+
+    it('should start with zero', async function () {
+      preApproved = await token.allowance(accounts[0], accounts[1]);
+      assert.equal(preApproved, 0);
+    });
+
+    it('should increase by 50 then decrease by 10', async function () {
+      const abiMethod = findMethod(token.abi, 'increaseApproval', 'address,uint256');
+      const increaseApprovalData = ethjsABI.encodeMethod(abiMethod,
+        [accounts[1], 50]
+      );
+      await token.sendTransaction(
+        { from: accounts[0], data: increaseApprovalData }
+      );
+      let postIncrease = await token.allowance(accounts[0], accounts[1]);
+      preApproved.plus(50).should.be.bignumber.equal(postIncrease);
+      await token.decreaseApproval(accounts[1], 10);
+      let postDecrease = await token.allowance(accounts[0], accounts[1]);
+      postIncrease.minus(10).should.be.bignumber.equal(postDecrease);
+    });
+  });
+
+  it('should increase by 50 then set to 0 when decreasing by more than 50', async function () {
+    await token.approve(accounts[1], 50);
+    await token.decreaseApproval(accounts[1], 60);
+    let postDecrease = await token.allowance(accounts[0], accounts[1]);
+    postDecrease.should.be.bignumber.equal(0);
+  });
+
+  it('should throw an error when trying to transfer to 0x0', async function () {
+    await token.transfer(0x0, 100).should.be.rejectedWith(EVMRevert);
+  });
+
+  it('should throw an error when trying to transferFrom to 0x0', async function () {
+    await token.approve(accounts[1], 100);
+    await token.transferFrom(accounts[0], 0x0, 100, { from: accounts[1] })
+      .should.be.rejectedWith(EVMRevert);
+  });
+
+  describe('Test ERC827 methods', function () {
+    it(
+      'should return correct balances after transfer (with data) and show the event on receiver contract'
+      , async function () {
+        const message = await Message.new();
+
+        const extraData = message.contract.showMessage.getData(
+          web3.toHex(123456), 666, 'Transfer Done'
+        );
+        const abiMethod = findMethod(token.abi, 'transfer', 'address,uint256,bytes');
+        const transferData = ethjsABI.encodeMethod(abiMethod,
+          [message.contract.address, 100, extraData]
+        );
+        const transaction = await token.sendTransaction(
+          { from: accounts[0], data: transferData }
+        );
+
+        assert.equal(2, transaction.receipt.logs.length);
+
+        new BigNumber(100).should.be.bignumber.equal(
+          await token.balanceOf(message.contract.address)
+        );
+      });
+
+    it(
+      'should return correct allowance after approve (with data) and show the event on receiver contract'
+      , async function () {
+        const message = await Message.new();
+
+        const extraData = message.contract.showMessage.getData(
+          web3.toHex(123456), 666, 'Transfer Done'
+        );
+
+        const abiMethod = findMethod(token.abi, 'approve', 'address,uint256,bytes');
+        const approveData = ethjsABI.encodeMethod(abiMethod,
+          [message.contract.address, 100, extraData]
+        );
+        const transaction = await token.sendTransaction(
+          { from: accounts[0], data: approveData }
+        );
+
+        assert.equal(2, transaction.receipt.logs.length);
+
+        new BigNumber(100).should.be.bignumber.equal(
+          await token.allowance(accounts[0], message.contract.address)
+        );
+      });
+
+    it(
+      'should return correct allowance after increaseApproval (with data) and show the event on receiver contract'
+      , async function () {
+        const message = await Message.new();
+
+        const extraData = message.contract.showMessage.getData(
+          web3.toHex(123456), 666, 'Transfer Done'
+        );
+
+        await token.approve(message.contract.address, 10);
+        new BigNumber(10).should.be.bignumber.equal(
+          await token.allowance(accounts[0], message.contract.address)
+        );
+
+        const abiMethod = findMethod(token.abi, 'increaseApproval', 'address,uint256,bytes');
+        const increaseApprovalData = ethjsABI.encodeMethod(abiMethod,
+          [message.contract.address, 50, extraData]
+        );
+        const transaction = await token.sendTransaction(
+          { from: accounts[0], data: increaseApprovalData }
+        );
+
+        assert.equal(2, transaction.receipt.logs.length);
+
+        new BigNumber(60).should.be.bignumber.equal(
+          await token.allowance(accounts[0], message.contract.address)
+        );
+      });
+
+    it(
+      'should return correct allowance after decreaseApproval (with data) and show the event on receiver contract'
+      , async function () {
+        const message = await Message.new();
+
+        await token.approve(message.contract.address, 100);
+
+        new BigNumber(100).should.be.bignumber.equal(
+          await token.allowance(accounts[0], message.contract.address)
+        );
+
+        const extraData = message.contract.showMessage.getData(
+          web3.toHex(123456), 666, 'Transfer Done'
+        );
+
+        const abiMethod = findMethod(token.abi, 'decreaseApproval', 'address,uint256,bytes');
+        const decreaseApprovalData = ethjsABI.encodeMethod(abiMethod,
+          [message.contract.address, 60, extraData]
+        );
+        const transaction = await token.sendTransaction(
+          { from: accounts[0], data: decreaseApprovalData }
+        );
+
+        assert.equal(2, transaction.receipt.logs.length);
+
+        new BigNumber(40).should.be.bignumber.equal(
+          await token.allowance(accounts[0], message.contract.address)
+        );
+      });
+
+    it(
+      'should return correct balances after transferFrom (with data) and show the event on receiver contract'
+      , async function () {
+        const message = await Message.new();
+
+        const extraData = message.contract.showMessage.getData(
+          web3.toHex(123456), 666, 'Transfer Done'
+        );
+
+        await token.approve(accounts[1], 100, { from: accounts[0] });
+
+        new BigNumber(100).should.be.bignumber.equal(
+          await token.allowance(accounts[0], accounts[1])
+        );
+
+        const abiMethod = findMethod(token.abi, 'transferFrom', 'address,address,uint256,bytes');
+        const transferFromData = ethjsABI.encodeMethod(abiMethod,
+          [accounts[0], message.contract.address, 100, extraData]
+        );
+        const transaction = await token.sendTransaction(
+          { from: accounts[1], data: transferFromData }
+        );
+
+        assert.equal(2, transaction.receipt.logs.length);
+
+        new BigNumber(100).should.be.bignumber.equal(
+          await token.balanceOf(message.contract.address)
+        );
+      });
+
+    it('should fail inside approve (with data)', async function () {
+      const message = await Message.new();
+
+      const extraData = message.contract.fail.getData();
+
+      const abiMethod = findMethod(token.abi, 'approve', 'address,uint256,bytes');
+      const approveData = ethjsABI.encodeMethod(abiMethod,
+        [message.contract.address, 10, extraData]
+      );
+      await token.sendTransaction(
+        { from: accounts[0], data: approveData }
+      ).should.be.rejectedWith(EVMRevert);
+
+      // approval should not have gone through so allowance is still 0
+      new BigNumber(0).should.be.bignumber
+        .equal(await token.allowance(accounts[1], message.contract.address));
+    });
+
+    it('should fail inside transfer (with data)', async function () {
+      const message = await Message.new();
+
+      const extraData = message.contract.fail.getData();
+
+      const abiMethod = findMethod(token.abi, 'transfer', 'address,uint256,bytes');
+      const transferData = ethjsABI.encodeMethod(abiMethod,
+        [message.contract.address, 10, extraData]
+      );
+      await token.sendTransaction(
+        { from: accounts[0], data: transferData }
+      ).should.be.rejectedWith(EVMRevert);
+
+      // transfer should not have gone through, so balance is still 0
+      new BigNumber(0).should.be.bignumber
+        .equal(await token.balanceOf(message.contract.address));
+    });
+
+    it('should fail inside transferFrom (with data)', async function () {
+      const message = await Message.new();
+
+      const extraData = message.contract.fail.getData();
+
+      await token.approve(accounts[1], 10, { from: accounts[2] });
+
+      const abiMethod = findMethod(token.abi, 'transferFrom', 'address,address,uint256,bytes');
+      const transferFromData = ethjsABI.encodeMethod(abiMethod,
+        [accounts[2], message.contract.address, 10, extraData]
+      );
+      await token.sendTransaction(
+        { from: accounts[1], data: transferFromData }
+      ).should.be.rejectedWith(EVMRevert);
+
+      // transferFrom should have failed so balance is still 0 but allowance is 10
+      new BigNumber(10).should.be.bignumber
+        .equal(await token.allowance(accounts[2], accounts[1]));
+      new BigNumber(0).should.be.bignumber
+        .equal(await token.balanceOf(message.contract.address));
+    });
+
+    it('should fail approve (with data) when using token contract address as receiver', async function () {
+      const message = await Message.new();
+
+      const extraData = message.contract.showMessage.getData(
+        web3.toHex(123456), 666, 'Transfer Done'
+      );
+
+      const abiMethod = findMethod(token.abi, 'approve', 'address,uint256,bytes');
+      const approveData = ethjsABI.encodeMethod(abiMethod,
+        [token.contract.address, 100, extraData]
+      );
+      await token.sendTransaction(
+        { from: accounts[0], data: approveData }
+      ).should.be.rejectedWith(EVMRevert);
+    });
+
+    it('should fail transfer (with data) when using token contract address as receiver', async function () {
+      const message = await Message.new();
+
+      const extraData = message.contract.showMessage.getData(
+        web3.toHex(123456), 666, 'Transfer Done'
+      );
+
+      const abiMethod = findMethod(token.abi, 'transfer', 'address,uint256,bytes');
+      const transferData = ethjsABI.encodeMethod(abiMethod,
+        [token.contract.address, 100, extraData]
+      );
+      await token.sendTransaction(
+        { from: accounts[0], data: transferData }
+      ).should.be.rejectedWith(EVMRevert);
+    });
+
+    it('should fail transferFrom (with data) when using token contract address as receiver', async function () {
+      const message = await Message.new();
+
+      const extraData = message.contract.showMessage.getData(
+        web3.toHex(123456), 666, 'Transfer Done'
+      );
+
+      await token.approve(accounts[1], 1, { from: accounts[0] });
+
+      const abiMethod = findMethod(token.abi, 'transferFrom', 'address,address,uint256,bytes');
+      const transferFromData = ethjsABI.encodeMethod(abiMethod,
+        [accounts[0], token.contract.address, 1, extraData]
+      );
+      await token.sendTransaction(
+        { from: accounts[1], data: transferFromData }
+      ).should.be.rejectedWith(EVMRevert);
+    });
+  });
+});