Add test for CLogFileRoller

Tests/Tests.csproj

@@ -43,6 +43,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="VocaluxeLib\Log\Rolling\CLogFileRollerTest.cs" />
     <Compile Include="VocaluxeLib\Utils\Combinatorics\CCombinationsTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="VocaluxeLib\XML\CXmlSerializerTest.cs" />

Tests/VocaluxeLib/Log/Rolling/CLogFileRollerTest.cs

@@ -0,0 +1,110 @@
+#region license
+// This file is part of Vocaluxe.
+// 
+// Vocaluxe is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// Vocaluxe is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
+#endregion
+
+using System;
+using System.IO;
+using NUnit.Framework;
+using VocaluxeLib.Log.Rolling;
+
+namespace Tests.VocaluxeLib.Log.Rolling
+{
+    [TestFixture]
+    public class CLogFileRollerTest
+    {
+        private const string _TestFileName = "Test.log";
+        private string _TestFolder;
+
+        #region Setup methods
+
+        [SetUp]
+        public void SetUp()
+        {
+            _TestFolder = _GetTemporaryDirectory();
+        }
+
+        [TearDown]
+        public void TearDown()
+        {
+            Directory.Delete(_TestFolder, true);
+        }
+
+        #endregion
+
+        #region Tests
+
+        [Test]
+        public void RollFilesTest([Range(0,4)] int numFilesExisting, [Range(0, 3)] int numOldFilesToKeep)
+        {
+            // Create existing files
+            if (numFilesExisting > 0)
+            {
+                CreateFile(_TestFolder, _TestFileName, 0);
+            }
+            
+            for (var i = 1; i < numFilesExisting; i++)
+            {
+                CreateFile(_TestFolder, GetFileName(i), i);
+            }
+
+
+            // Roll the files
+            CLogFileRoller.RollLogs(Path.Combine(_TestFolder, _TestFileName), numOldFilesToKeep);
+            
+
+            // Check main file
+            Assert.IsFalse(File.Exists(Path.Combine(_TestFolder, _TestFileName)), "Main file was not deleted.");
+            //Check other files
+            for (int i = 1; i <= Math.Max(numOldFilesToKeep, numFilesExisting); i++)
+            {
+                var fileToCheck = Path.Combine(_TestFolder, GetFileName(i));
+                if (i <= Math.Min(numFilesExisting,numOldFilesToKeep))
+                {
+                    Assert.IsTrue(File.Exists(fileToCheck), $"File {GetFileName(i)} is missing.");
+                    Assert.AreEqual((i - 1).ToString(), File.ReadAllText(fileToCheck), "Rotation is wrong");
+                }
+                else
+                {
+                    Assert.IsFalse(File.Exists(fileToCheck));
+                }
+            }
+        }
+
+        #endregion
+
+        #region Helper methods
+
+        private string _GetTemporaryDirectory()
+        {
+            string tempDirectory = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
+            Directory.CreateDirectory(tempDirectory);
+            return tempDirectory;
+        }
+
+        private void CreateFile(string folder, string file, int i)
+        {
+            File.WriteAllText(Path.Combine(folder, file), i.ToString());
+        }
+
+        private string GetFileName(int i)
+        {
+            return _TestFileName.Replace(".", $"_{i}.");
+        }
+
+        #endregion
+
+    }
+}