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diff --git a/src/test/Example.Extension/ExamplePreprocessorExtensionAndCommandLine.cs b/src/test/Example.Extension/ExamplePreprocessorExtensionAndCommandLine.cs
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+++ b/src/test/Example.Extension/ExamplePreprocessorExtensionAndCommandLine.cs
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+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace Example.Extension
+{
+    using System;
+    using System.Collections.Generic;
+    using WixToolset.Extensibility;
+    using WixToolset.Extensibility.Services;
+
+    internal class ExamplePreprocessorExtensionAndCommandLine : BasePreprocessorExtension, IExtensionCommandLine
+    {
+        private string exampleValueFromCommandLine;
+
+        public IEnumerable<ExtensionCommandLineSwitch> CommandLineSwitches => throw new NotImplementedException();
+
+        public ExamplePreprocessorExtensionAndCommandLine()
+        {
+            this.Prefixes = new[] { "ex" };
+        }
+
+        public void PreParse(ICommandLineContext context)
+        {
+        }
+
+        public bool TryParseArgument(IParseCommandLine parseCommandLine, string arg)
+        {
+            if (parseCommandLine.IsSwitch(arg) && arg.Substring(1).Equals("example", StringComparison.OrdinalIgnoreCase))
+            {
+                this.exampleValueFromCommandLine = parseCommandLine.GetNextArgumentOrError(arg);
+                return true;
+            }
+
+            return false;
+        }
+
+        public void PostParse()
+        {
+        }
+
+        public override string GetVariableValue(string prefix, string name)
+        {
+            if (prefix == "ex" && "test".Equals(name, StringComparison.OrdinalIgnoreCase))
+            {
+                return String.IsNullOrWhiteSpace(this.exampleValueFromCommandLine) ? "(null)" : this.exampleValueFromCommandLine;
+            }
+
+            return null;
+        }
+    }
+}
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