Unit Tests for UrlEncode limit fix

Author: robertmiles3

RestSharp.Tests/StringExtensionsTests.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using RestSharp.Extensions;
+using Xunit;
+
+namespace RestSharp.Tests
+{
+    public class StringExtensionsTests
+    {
+        [Fact]
+        public void UrlEncode_Throws_ArgumentNullException_For_Null_Input()
+        {
+            const string nullString = null;
+            Assert.Throws<System.ArgumentNullException>(
+                delegate
+                {
+                    nullString.UrlEncode();
+                });   
+        }
+
+        [Fact]
+        public void UrlEncode_Returns_Correct_Length_When_Less_Than_Limit()
+        {
+            const int numLessThanLimit = 32766;
+            string stringWithLimitLength = new string('*', numLessThanLimit);
+            Assert.True(stringWithLimitLength.UrlEncode().Length == numLessThanLimit);
+        }
+
+        [Fact]
+        public void UrlEncode_Returns_Correct_Length_When_More_Than_Limit()
+        {
+            const int numGreaterThanLimit = 65000;
+            string stringWithLimitLength = new string('*', numGreaterThanLimit);
+            Assert.True(stringWithLimitLength.UrlEncode().Length == numGreaterThanLimit);
+        }
+    }
+}