Add a few commands related to features:

feature list
feature enable
feature disable

--HG--
branch : dev

src/Orchard.Tests/Utility/Extensions/StringExtensionsTests.cs

@@ -4,6 +4,20 @@ using Orchard.Utility.Extensions;
 namespace Orchard.Tests.Utility.Extensions {
     [TestFixture]
     public class StringExtensionsTests {
+        [Test]
+        public void OrDefault_ReturnsDefaultForNull() {
+            const string s = null;
+            Assert.That(s.OrDefault("test"), Is.SameAs("test"));
+        }
+        [Test]
+        public void OrDefault_ReturnsDefault() {
+            Assert.That("".OrDefault("test"), Is.SameAs("test"));
+        }
+
+        [Test]
+        public void OrDefault_ReturnsString() {
+            Assert.That("bar".OrDefault("test"), Is.SameAs("bar"));
+        }
         [Test]
         public void IsNullOrEmptyTrimmed_EmptyStringReturnsTrue() {
             const string testString = "";