simplify mocks

contracts/mocks/BurnableTokenMock.sol

@@ -1,12 +1,12 @@
 pragma solidity ^0.4.24;
 
+import "./StandardTokenMock.sol";
 import "../token/ERC20/BurnableToken.sol";
 
 
-contract BurnableTokenMock is BurnableToken {
-
-  constructor(address _initialAccount, uint256 _initialBalance) public {
-    _mint(_initialAccount, _initialBalance);
-  }
-
+contract BurnableTokenMock is StandardTokenMock, BurnableToken {
+  constructor(address _initialAccount, uint256 _initialBalance)
+    StandardTokenMock(_initialAccount, _initialBalance)
+    public
+  { }
 }

contracts/mocks/ERC223TokenMock.sol

@@ -1,5 +1,6 @@
 pragma solidity ^0.4.24;
 
+import "./StandardTokenMock.sol";
 import "../token/ERC20/StandardToken.sol";
 
 
@@ -8,11 +9,12 @@ contract ERC223ContractInterface {
 }
 
 
-contract ERC223TokenMock is StandardToken {
+contract ERC223TokenMock is StandardTokenMock {
 
-  constructor(address _initialAccount, uint256 _initialBalance) public {
-    _mint(_initialAccount, _initialBalance);
-  }
+  constructor(address _initialAccount, uint256 _initialBalance)
+    StandardTokenMock(_initialAccount, _initialBalance)
+    public
+  { }
 
   // ERC223 compatible transfer function (except the name)
   function transferERC223(address _to, uint256 _value, bytes _data) public

contracts/mocks/PausableTokenMock.sol

@@ -1,13 +1,15 @@
 pragma solidity ^0.4.24;
 
+import "./StandardTokenMock.sol";
 import "../token/ERC20/PausableToken.sol";
 
 
 // mock class using PausableToken
-contract PausableTokenMock is PausableToken {
+contract PausableTokenMock is StandardTokenMock, PausableToken {
 
-  constructor(address _initialAccount, uint _initialBalance) public {
-    _mint(_initialAccount, _initialBalance);
-  }
+  constructor(address _initialAccount, uint256 _initialBalance)
+    StandardTokenMock(_initialAccount, _initialBalance)
+    public
+  { }
 
 }