Add unit tests

TrimTail.sln

@@ -5,6 +5,8 @@ VisualStudioVersion = 17.10.34916.146
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TrimTail", "TrimTail\TrimTail.csproj", "{39D166FE-7C39-4B23-88F5-452204C811D4}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TrimTailTests", "TrimTailTests\TrimTailTests.csproj", "{561B2D63-F0D4-40BA-8061-A25DA82D1307}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{39D166FE-7C39-4B23-88F5-452204C811D4}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{39D166FE-7C39-4B23-88F5-452204C811D4}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{39D166FE-7C39-4B23-88F5-452204C811D4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{561B2D63-F0D4-40BA-8061-A25DA82D1307}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{561B2D63-F0D4-40BA-8061-A25DA82D1307}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{561B2D63-F0D4-40BA-8061-A25DA82D1307}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{561B2D63-F0D4-40BA-8061-A25DA82D1307}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

TrimTail/Program.cs

@@ -1,10 +1,10 @@
 namespace TrimTail
 {
-    internal class Program
+    public class Program
     {
         private static readonly SemaphoreSlim sem = new(1);
 
-        private static bool HasTrailingBlanks(in string file_path)
+        public static bool HasTrailingBlanks(in string file_path)
         {
             using var file = File.OpenText(file_path);
             string? line;
@@ -19,7 +19,7 @@ private static bool HasTrailingBlanks(in string file_path)
             return false;
         }
 
-        private static void RemoveTrailingBlanks(in string file_path)
+        public static void RemoveTrailingBlanks(in string file_path)
         {
             if (!HasTrailingBlanks(file_path)) return;
 
@@ -47,10 +47,18 @@ private static void RemoveTrailingBlanks(in string file_path)
                     }
                 }
             }
-            File.Replace(temp_path, file_path, null);
+            try
+            {
+                File.Replace(temp_path, file_path, null);
+            }
+            catch (IOException)
+            {
+                File.Copy(temp_path, file_path, true);
+                File.Delete(temp_path);
+            }
         }
 
-        private static void ProcessDir(string dir_path, HashSet<string> allowed_exts)
+        public static void ProcessDir(string dir_path, HashSet<string> allowed_exts)
         {
             Console.WriteLine($"Processing directory: {dir_path}");
 

TrimTailTests/TrimTailTests.cs

@@ -0,0 +1,58 @@
+using TrimTail;
+
+namespace TrimTailTests
+{
+    [TestClass]
+    public class TrimTailTests
+    {
+        [TestMethod]
+        public void TestHasTrailingBlanks()
+        {
+            const string filePath = "test.txt";
+
+            File.WriteAllText(filePath, "Test w/ trailing spaces    ");
+            Assert.IsTrue(Program.HasTrailingBlanks(filePath));
+            File.Delete(filePath);
+
+            File.WriteAllText(filePath, "Test w/ trailing tabs\t\t");
+            Assert.IsTrue(Program.HasTrailingBlanks(filePath));
+            File.Delete(filePath);
+
+            File.WriteAllText(filePath, "Test w/o trailing blanks");
+            Assert.IsFalse(Program.HasTrailingBlanks(filePath));
+            File.Delete(filePath);
+        }
+
+        [TestMethod]
+        public void TestRemoveTrailingBlanks()
+        {
+            const string filePath = "test.txt";
+            string content;
+
+            File.WriteAllText(filePath, "Test w/ trailing blanks    ");
+            Program.RemoveTrailingBlanks(filePath);
+            content = File.ReadAllText(filePath);
+            Assert.AreEqual("Test w/ trailing blanks", content);
+            File.Delete(filePath);
+
+            File.WriteAllText(filePath, "Test w/ trailing blanks and newline    \r\n");
+            Program.RemoveTrailingBlanks(filePath);
+            content = File.ReadAllText(filePath);
+            Assert.AreEqual("Test w/ trailing blanks and newline\r\n", content);
+            File.Delete(filePath);
+        }
+
+        [TestMethod]
+        public void TestProcessDir()
+        {
+            const string dirPath = "testDir";
+            Directory.CreateDirectory(dirPath);
+            File.WriteAllText(Path.Combine(dirPath, "test1.txt"), "This is a test with trailing blanks    ");
+            File.WriteAllText(Path.Combine(dirPath, "test2.txt"), "Another test with trailing blanks    ");
+            Program.ProcessDir(dirPath, [".txt"]);
+            var files = Directory.EnumerateFiles(dirPath, "*", SearchOption.AllDirectories);
+            Assert.IsTrue(files.All(filePath => !File.ReadAllText(filePath).EndsWith(' ')));
+            Directory.Delete(dirPath, true);
+        }
+    }
+}

TrimTailTests/TrimTailTests.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.1.1" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.1.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\TrimTail\TrimTail.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Microsoft.VisualStudio.TestTools.UnitTesting" />
+  </ItemGroup>
+
+</Project>