1 files changed, 89 insertions, 0 deletions
diff --git a/src/Microsoft.NuGet.Build.Tasks.Tests/Helpers/MockBuildEngine.cs b/src/Microsoft.NuGet.Build.Tasks.Tests/Helpers/MockBuildEngine.cs
new file mode 100644
index 0000000..8686871
--- /dev/null
+++ b/src/Microsoft.NuGet.Build.Tasks.Tests/Helpers/MockBuildEngine.cs
@@ -0,0 +1,89 @@
+// Copyright (c) .NET Foundation. All rights reserved. 
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. 
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Build.Framework;
+
+namespace Microsoft.NuGet.Build.Tasks.Tests.Helpers
+{
+    public class MockBuildEngine : IBuildEngine, IBuildEngine2, IBuildEngine3, IBuildEngine4
+    {
+        public MockBuildEngine(TextWriter output)
+        {
+            this.Output = output;
+        }
+
+        private TextWriter Output { get; }
+
+        int IBuildEngine.ColumnNumberOfTaskNode => -1;
+
+        bool IBuildEngine.ContinueOnError => false;
+
+        int IBuildEngine.LineNumberOfTaskNode => -1;
+
+        string IBuildEngine.ProjectFileOfTaskNode => "this.xml";
+
+        bool IBuildEngine2.IsRunningMultipleNodes => false;
+
+        bool IBuildEngine.BuildProjectFile(string projectFileName, string[] targetNames, IDictionary globalProperties, IDictionary targetOutputs) => true;
+
+        void IBuildEngine.LogCustomEvent(CustomBuildEventArgs e)
+        {
+            this.Output.WriteLine($"Custom: {e.Message}");
+        }
+
+        void IBuildEngine.LogErrorEvent(BuildErrorEventArgs e)
+        {
+            this.Output.WriteLine($"Error: {e.Message}");
+        }
+
+        void IBuildEngine.LogMessageEvent(BuildMessageEventArgs e)
+        {
+            this.Output.WriteLine($"Message: {e.Message}");
+        }
+
+        void IBuildEngine.LogWarningEvent(BuildWarningEventArgs e)
+        {
+            this.Output.WriteLine($"Warning: {e.Message}");
+        }
+
+        private Dictionary<object, object> Tasks = new Dictionary<object, object>();
+
+        void IBuildEngine4.RegisterTaskObject(object key, object obj, RegisteredTaskObjectLifetime lifetime, bool allowEarlyCollection)
+        {
+            Tasks.Add(key, obj);
+        }
+
+        object IBuildEngine4.GetRegisteredTaskObject(object key, RegisteredTaskObjectLifetime lifetime)
+        {
+            return null;
+        }
+
+        object IBuildEngine4.UnregisterTaskObject(object key, RegisteredTaskObjectLifetime lifetime)
+        {
+            var obj = Tasks[key];
+            Tasks.Remove(key);
+            return obj;
+        }
+
+        BuildEngineResult IBuildEngine3.BuildProjectFilesInParallel(string[] projectFileNames, string[] targetNames, IDictionary[] globalProperties, IList<string>[] removeGlobalProperties, string[] toolsVersion, bool returnTargetOutputs)
+        {
+            throw new NotImplementedException();
+        }
+
+        void IBuildEngine3.Yield() { }
+
+        void IBuildEngine3.Reacquire() { }
+
+        bool IBuildEngine2.BuildProjectFile(string projectFileName, string[] targetNames, IDictionary globalProperties, IDictionary targetOutputs, string toolsVersion) => true;
+
+        bool IBuildEngine2.BuildProjectFilesInParallel(string[] projectFileNames, string[] targetNames, IDictionary[] globalProperties, IDictionary[] targetOutputsPerProject, string[] toolsVersion, bool useResultsCache, bool unloadProjectsOnCompletion) => true;
+    }
+}