adding unit test for validating language xml files.

src/Umbraco.Tests/Configurations/LanguageXmlTests.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Xml;
+using NUnit.Framework;
+using Umbraco.Tests.TestHelpers;
+
+namespace Umbraco.Tests.Configurations
+{
+    [TestFixture]
+    public class LanguageXmlTests
+    {
+        [Test]
+        public void Can_Load_Language_Xml_Files()
+        {
+            var languageDirectory = GetLanguageDirectory();
+            var readFilesCount = 0;
+            var xmlDocument = new XmlDocument();
+            foreach (var languageFile in languageDirectory.EnumerateFiles("*.xml"))
+            {
+                // Load will throw an exception if the XML isn't valid.
+                xmlDocument.Load(languageFile.FullName);
+                readFilesCount++;
+            }
+
+            // Ensure that at least one file was read.
+            Assert.AreNotEqual(0, readFilesCount);
+        }
+
+        private static DirectoryInfo GetLanguageDirectory()
+        {
+            var testDirectoryPathParts = Path.GetDirectoryName(TestContext.CurrentContext.TestDirectory)
+                .Split(new[] { Path.DirectorySeparatorChar }, StringSplitOptions.RemoveEmptyEntries);
+            var solutionDirectoryPathParts = testDirectoryPathParts
+                .Take(Array.IndexOf(testDirectoryPathParts, "src") + 1);
+            var languageFolderPathParts = new List<string>(solutionDirectoryPathParts);
+            var additionalPathParts = new[] { "Umbraco.Web.UI", "Umbraco", "config", "lang" };
+            languageFolderPathParts.AddRange(additionalPathParts);
+
+            // Hack for build-server - when this path is generated in that envrionment it's missing the "src" folder.
+            // Not sure why, but if it's missing we'll add it in the right place.
+            if (!languageFolderPathParts.Contains("src"))
+            {
+                languageFolderPathParts.Insert(languageFolderPathParts.Count - additionalPathParts.Length, "src");
+            }
+
+            return new DirectoryInfo(string.Join(Path.DirectorySeparatorChar.ToString(), languageFolderPathParts));
+        }
+    }
+}

src/Umbraco.Tests/Umbraco.Tests.csproj

@@ -120,6 +120,7 @@
     <Compile Include="Composing\CompositionTests.cs" />
     <Compile Include="Composing\LightInjectValidation.cs" />
     <Compile Include="Composing\ContainerConformingTests.cs" />
+    <Compile Include="Configurations\LanguageXmlTests.cs" />
     <Compile Include="Configurations\GlobalSettingsTests.cs" />
     <Compile Include="CoreThings\CallContextTests.cs" />
     <Compile Include="Components\ComponentTests.cs" />