1 files changed, 63 insertions, 0 deletions
diff --git a/tests/src/CoreMangLib/cti/system/double/doublenan.cs b/tests/src/CoreMangLib/cti/system/double/doublenan.cs
new file mode 100644
index 0000000000..907b82cafd
--- /dev/null
+++ b/tests/src/CoreMangLib/cti/system/double/doublenan.cs
@@ -0,0 +1,63 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+using System;
+using System.Collections;
+
+/// <summary>
+/// NaN
+/// </summary>
+public class DoubleNaN
+{
+    public static int Main()
+    {
+        DoubleNaN test = new DoubleNaN();
+        TestLibrary.TestFramework.BeginTestCase("DoubleNaN");
+
+        if (test.RunTests())
+        {
+            TestLibrary.TestFramework.EndTestCase();
+            TestLibrary.TestFramework.LogInformation("PASS");
+            return 100;
+        }
+        else
+        {
+            TestLibrary.TestFramework.EndTestCase();
+            TestLibrary.TestFramework.LogInformation("FAIL");
+            return 0;
+        }
+    }
+
+    public bool RunTests()
+    {
+        bool retVal = true;
+
+        TestLibrary.TestFramework.LogInformation("[Positive]");
+        retVal = PosTest1() && retVal;
+
+        return retVal;
+    }
+
+    public bool PosTest1()
+    {
+        bool retVal = true;
+        TestLibrary.TestFramework.BeginScenario("PosTest1: Ensure NaN is not a number");
+
+        try
+        {
+            if (Double.IsNaN(Double.NaN) != true)
+            {
+                TestLibrary.TestFramework.LogError("001.1", "NaN is a number!");
+                retVal = false;
+            }
+        }
+        catch (Exception e)
+        {
+            TestLibrary.TestFramework.LogError("001.2", "Unexpected exception: " + e);
+            TestLibrary.TestFramework.LogInformation(e.StackTrace);
+            retVal = false;
+        }
+
+        return retVal;
+    }
+}