Drafted test framework.

contracts/mocks/EnumerablesMock.sol

@@ -0,0 +1,114 @@
+pragma solidity ^0.5.0;
+import "../drafts/Enumerables.sol";
+
+
+contract EnumerablesMock {
+    using Enumerables for Enumerables.Enumerable;
+
+    Enumerables.Enumerable public enumerable;
+
+    constructor() public {
+        enumerable = Enumerables.Enumerable(0, 0, 0); // Maybe have a factory method in the library.
+    }
+
+    /**
+     * @dev Retrieves the Object denoted by `id`.
+     */
+    function testGet(uint256 id)
+        public
+        view
+        returns (uint256, uint256, uint256, address)
+    {
+        return Enumerables.get(enumerable, id);
+    }
+
+    /**
+     * @dev Insert a new Object as the new Head with `data` in the data field.
+     */
+    function testAppend(address data)
+        public
+    {
+        Enumerables.append(enumerable, data);
+    }
+
+    /**
+     * @dev Remove the Object denoted by `id` from the List.
+     */
+    function testRemove(uint256 id)
+        public
+    {
+        Enumerables.remove(enumerable, id);
+    }
+
+    /**
+     * @dev Returns true if at least one Object matches `data` in the data field.
+     * TODO: What happens with address(0) as data?
+     */
+    function testContains(address data)
+        public
+        view
+        returns (bool)
+    {
+
+        return Enumerables.contains(enumerable, data);
+    }
+
+    /**
+     * @dev Returns the length of the enumerable.
+     */
+    function testLength()
+        public
+        view
+        returns (uint256)
+    {
+        return Enumerables.length(enumerable);
+    }
+
+    /**
+     * @dev Returns all the data fields in the enumerable, in an array ordered from head to tail.
+     */
+    function enumerate()
+        public
+        view
+        returns (address[] memory)
+    {
+        return Enumerables.enumerate(enumerable);
+    }
+
+    /**
+     * @dev Internal function to update the Head pointer.
+     */
+    function testSetHead(uint256 id)
+        public
+    {
+        Enumerables._setHead(enumerable, id);
+    }
+
+    /**
+     * @dev Internal function to update the Tail pointer.
+     */
+    function testSetTail(uint256 id)
+        public
+    {
+        Enumerables._setTail(enumerable, id);
+    }
+
+    /**
+     * @dev Internal function to create an unlinked Object.
+     */
+    function testCreateObject(address data)
+        public
+        returns (uint256)
+    {
+        return Enumerables._createObject(enumerable, data);
+    }
+
+    /**
+     * @dev Internal function to link an Object to another.
+     */
+    function testLink(uint256 prevId, uint256 nextId)
+        public
+    {
+        Enumerables._link(enumerable, prevId, nextId);
+    }
+}