diff --git a/X10D.Tests/src/StringTests.cs b/X10D.Tests/src/StringTests.cs
new file mode 100644
index 0000000..b4ccf4f
--- /dev/null
+++ b/X10D.Tests/src/StringTests.cs
@@ -0,0 +1,34 @@
+namespace X10D.Tests
+{
+    using System.Linq;
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+    /// <summary>
+    /// Tests for <see cref="StringExtensions"/>.
+    /// </summary>
+    [TestClass]
+    public class StringTests
+    {
+        /// <summary>
+        /// Tests for <see cref="StringExtensions.Repeat"/>.
+        /// </summary>
+        [TestMethod]
+        public void Repeat()
+        {
+            Assert.AreEqual("foofoofoofoofoo", "foo".Repeat(5));
+        }
+
+        /// <summary>
+        /// Tests for <see cref="StringExtensions.Split"/>.
+        /// </summary>
+        [TestMethod]
+        public void Split()
+        {
+            const string str = "Hello World";
+
+            // ReSharper disable once SuggestVarOrType_Elsewhere
+            var arr = str.Split(2).ToArray();
+            CollectionAssert.AreEqual(new[] { "He", "ll", "o ", "Wo", "rl", "d" }, arr);
+        }
+    }
+}