Add tests for OriginalFilenameFileOutputPathFormatter

ImageCore.Tests/TestOriginalFilenameFileOutputPathFormatter.cs

@@ -0,0 +1,28 @@
+using System;
+using Image;
+using Xunit;
+
+namespace ImageCore.Tests
+{
+    public class TestOriginalFilenameFileOutputPathFormatter
+    {
+
+        [Theory]
+        [InlineData("", "./", @".\.jpg")]
+        [InlineData("", @".\", @".\.jpg")]
+        [InlineData("", "asd", @".\asd.jpg")]
+        [InlineData("dir", "asd", @"dir\asd.jpg")]
+        public void TestGetOutputPath(string directory, string file, string expectedPath)
+        {
+            var outputPathFormatter = OriginalFilenameFileOutputPathFormatter.Create(directory);
+            Assert.Equal(expectedPath, outputPathFormatter.GetOutputPath(file));
+        }
+
+        [Fact]
+        public void TestGetOutputPathNull()
+        {
+            var outputPathFormatter = OriginalFilenameFileOutputPathFormatter.Create("directory");
+            Assert.Throws<ArgumentException>(() => outputPathFormatter.GetOutputPath(""));
+        }
+    }
+}

ImageCore/ImageCore.csproj

@@ -6,6 +6,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="Guard.Net" Version="2.0.0" />
         <PackageReference Include="Magick.NET-Q16-AnyCPU" Version="8.6.1" />
         <PackageReference Include="Magick.NET.Core" Version="8.6.1" />
         <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="6.0.0" />

ImageCore/OriginalFilenameFileOutputPathFormatter.cs

@@ -1,4 +1,5 @@
 using System.IO;
+using GuardNet;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;
 
@@ -19,6 +20,10 @@ namespace Image
         /// <param name="outputDirectory">The output directory.</param>
         public OriginalFilenameFileOutputPathFormatter(string outputDirectory)
         {
+            if (outputDirectory.Equals(""))
+            {
+                outputDirectory = ".";
+            }
             _outputDirectory = outputDirectory;
         }
 
@@ -29,6 +34,7 @@ namespace Image
         /// <returns>An absolute path of the form output_directory/initialFileName.jpg</returns>
         public string GetOutputPath(string initialFilePath)
         {
+            Guard.NotNullOrEmpty(initialFilePath, nameof(initialFilePath));
             var fileName = Path.GetFileName(initialFilePath)?.Split(".")[0];
             var path = Path.Join(_outputDirectory, $"{fileName}.jpg");
             return path;