Unit testing update (#199)

CryptoExchange.Net/Objects/AuthTimeProvider.cs

@@ -0,0 +1,10 @@
+using CryptoExchange.Net.Interfaces;
+using System;
+
+namespace CryptoExchange.Net.Objects
+{
+    internal class AuthTimeProvider : IAuthTimeProvider
+    {
+        public DateTime GetTime() => DateTime.UtcNow;
+    }
+}

CryptoExchange.Net/Objects/OrderedStringComparer.cs

@@ -0,0 +1,29 @@
+using System.Collections.Generic;
+
+namespace CryptoExchange.Net.Objects
+{
+    /// <summary>
+    /// Order string comparer, sorts by alphabetical order
+    /// </summary>
+    public class OrderedStringComparer : IComparer<string>
+    {
+        /// <summary>
+        /// Compare function
+        /// </summary>
+        /// <param name="x"></param>
+        /// <param name="y"></param>
+        /// <returns></returns>
+        public int Compare(string x, string y)
+        {
+            // Shortcuts: If both are null, they are the same.
+            if (x == null && y == null) return 0;
+
+            // If one is null and the other isn't, then the
+            // one that is null is "lesser".
+            if (x == null) return -1;
+            if (y == null) return 1;
+
+            return x.CompareTo(y);
+        }
+    }
+}