diff --git a/src/NzbDrone.Common.Test/ExtensionTests/StringExtensionTests/FirstCharacterToLowerFixture.cs b/src/NzbDrone.Common.Test/ExtensionTests/StringExtensionTests/FirstCharacterToLowerFixture.cs
new file mode 100644
index 000000000..d2df657d4
--- /dev/null
+++ b/src/NzbDrone.Common.Test/ExtensionTests/StringExtensionTests/FirstCharacterToLowerFixture.cs
@@ -0,0 +1,36 @@
+using System.Globalization;
+using FluentAssertions;
+using NUnit.Framework;
+using NzbDrone.Common.Extensions;
+
+namespace NzbDrone.Common.Test.ExtensionTests.StringExtensionTests
+{
+    [TestFixture]
+    public class FirstCharacterToLowerFixture
+    {
+        [TestCase("Hello", "hello")]
+        [TestCase("CamelCase", "camelCase")]
+        [TestCase("A Full Sentence", "a Full Sentence")]
+        [TestCase("", "")]
+        [TestCase(null, "")]
+        public void should_lower_case_first_character(string input, string expected)
+        {
+            input.FirstCharToLower().Should().Be(expected);
+        }
+
+        [Test]
+        public void should_lower_case_first_character_regardless_of_culture()
+        {
+            var current = CultureInfo.CurrentCulture;
+            CultureInfo.CurrentCulture = CultureInfo.GetCultureInfo("tr-TR");
+            try
+            {
+                "InfInite".FirstCharToLower().Should().Be("infInite");
+            }
+            finally
+            {
+                CultureInfo.CurrentCulture = current;
+            }
+        }
+    }
+}
diff --git a/src/NzbDrone.Common.Test/ExtensionTests/StringExtensionTests/FirstCharcacterToUpperFixture.cs b/src/NzbDrone.Common.Test/ExtensionTests/StringExtensionTests/FirstCharcacterToUpperFixture.cs
new file mode 100644
index 000000000..53e221f4e
--- /dev/null
+++ b/src/NzbDrone.Common.Test/ExtensionTests/StringExtensionTests/FirstCharcacterToUpperFixture.cs
@@ -0,0 +1,20 @@
+using FluentAssertions;
+using NUnit.Framework;
+using NzbDrone.Common.Extensions;
+
+namespace NzbDrone.Common.Test.ExtensionTests.StringExtensionTests
+{
+    [TestFixture]
+    public class FirstCharcacterToUpperFixture
+    {
+        [TestCase("hello", "Hello")]
+        [TestCase("camelCase", "CamelCase")]
+        [TestCase("a full sentence", "A full sentence")]
+        [TestCase("", "")]
+        [TestCase(null, "")]
+        public void should_capitalize_first_character(string input, string expected)
+        {
+            input.FirstCharToUpper().Should().Be(expected);
+        }
+    }
+}
diff --git a/src/NzbDrone.Common.Test/ExtensionTests/UrlExtensionsFixture.cs b/src/NzbDrone.Common.Test/ExtensionTests/UrlExtensionsFixture.cs
new file mode 100644
index 000000000..eae0736dc
--- /dev/null
+++ b/src/NzbDrone.Common.Test/ExtensionTests/UrlExtensionsFixture.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using FluentAssertions;
+using NUnit.Framework;
+using NzbDrone.Common.Extensions;
+
+namespace NzbDrone.Common.Test.ExtensionTests
+{
+    [TestFixture]
+    public class UrlExtensionsFixture
+    {
+        [TestCase("http://my.local/url")]
+        [TestCase("https://my.local/url")]
+        public void should_report_as_valid_url(string url)
+        {
+            url.IsValidUrl().Should().BeTrue();
+        }
+
+        [TestCase("")]
+        [TestCase(" http://my.local/url")]
+        [TestCase("http://my.local/url ")]
+        public void should_report_as_invalid_url(string url)
+        {
+            url.IsValidUrl().Should().BeFalse();
+        }
+    }
+}
diff --git a/src/NzbDrone.Common.Test/HashUtilFixture.cs b/src/NzbDrone.Common.Test/HashUtilFixture.cs
new file mode 100644
index 000000000..02869fa24
--- /dev/null
+++ b/src/NzbDrone.Common.Test/HashUtilFixture.cs
@@ -0,0 +1,21 @@
+using FluentAssertions;
+using NUnit.Framework;
+
+namespace NzbDrone.Common.Test
+{
+    [TestFixture]
+    public class HashUtilFixture
+    {
+        [Test]
+        public void should_create_anon_id()
+        {
+            HashUtil.AnonymousToken().Should().NotBeNullOrEmpty();
+        }
+
+        [Test]
+        public void should_create_the_same_id()
+        {
+            HashUtil.AnonymousToken().Should().Be(HashUtil.AnonymousToken());
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/NzbDrone.Common.Test/NzbDrone.Common.Test.csproj b/src/NzbDrone.Common.Test/NzbDrone.Common.Test.csproj
index 067706a2f..250da36ed 100644
--- a/src/NzbDrone.Common.Test/NzbDrone.Common.Test.csproj
+++ b/src/NzbDrone.Common.Test/NzbDrone.Common.Test.csproj
@@ -89,6 +89,10 @@
     <Compile Include="ExtensionTests\IEnumerableExtensionTests\IntersectByFixture.cs" />
     <Compile Include="ExtensionTests\Int64ExtensionFixture.cs" />
     <Compile Include="ExtensionTests\IPAddressExtensionsFixture.cs" />
+    <Compile Include="ExtensionTests\StringExtensionTests\FirstCharacterToLowerFixture.cs" />
+    <Compile Include="ExtensionTests\StringExtensionTests\FirstCharcacterToUpperFixture.cs" />
+    <Compile Include="ExtensionTests\UrlExtensionsFixture.cs" />
+    <Compile Include="HashUtilFixture.cs" />
     <Compile Include="Http\HttpClientFixture.cs" />
     <Compile Include="Http\HttpHeaderFixture.cs" />
     <Compile Include="Http\HttpRequestBuilderFixture.cs" />
diff --git a/src/NzbDrone.Common/Extensions/StringExtensions.cs b/src/NzbDrone.Common/Extensions/StringExtensions.cs
index 3de53ef0d..b7d058657 100644
--- a/src/NzbDrone.Common/Extensions/StringExtensions.cs
+++ b/src/NzbDrone.Common/Extensions/StringExtensions.cs
@@ -24,12 +24,22 @@ namespace NzbDrone.Common.Extensions
 
         public static string FirstCharToLower(this string input)
         {
-            return input.First().ToString().ToLower() + input.Substring(1);
+            if (string.IsNullOrEmpty(input))
+            {
+                return string.Empty;
+            }
+
+            return char.ToLowerInvariant(input.First()) + input.Substring(1);
         }
 
         public static string FirstCharToUpper(this string input)
         {
-            return input.First().ToString().ToUpper() + input.Substring(1);
+            if (string.IsNullOrEmpty(input))
+            {
+                return string.Empty;
+            }
+
+            return char.ToUpperInvariant(input.First()) + input.Substring(1);
         }
 
         public static string Inject(this string format, params object[] formattingArgs)