Add integration test for #406.

Author: Henning Moe

GitVersionTask.Tests/GitVersionTask.Tests.csproj

@@ -112,6 +112,7 @@
     <Compile Include="Helpers\Lg2sHelperBase.cs" />
     <Compile Include="UpdateAssemblyInfoTests.cs" />
     <Compile Include="ModuleInitializer.cs" />
+    <Compile Include="WriteVersionInfoToBuildLogTests.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="app.config" />

GitVersionTask.Tests/WriteVersionInfoToBuildLogTests.cs

@@ -0,0 +1,22 @@
+
+namespace GitVersionTask.Tests
+{
+    using System.IO;
+    using NUnit.Framework;
+
+    [TestFixture]
+    public class WriteVersionInfoToBuildLogTests
+    {
+        [Test]
+        public void UsingInvalidGitDirectory_ThrowsDirectoryNotFoundException()
+        {
+            var task = new WriteVersionInfoToBuildLog
+            {
+                BuildEngine = new MockBuildEngine(),
+                SolutionDirectory = Path.GetTempPath()
+            };
+
+            Assert.That(task.InnerExecute, Throws.InstanceOf<DirectoryNotFoundException>());
+        }
+    }
+}