Add tests for finding solution files and update code accordingly

Author: seveneleven

global.json

@@ -14,19 +14,24 @@ public static void Assert(string dir, Action<string> then, Action<string> onErro
 
         public static string GetSolutionName(string dir, Action<string> onError)
         {
-            var files = Directory.GetFiles(dir, "*.slnx");
-            if (files.Length == 0)
+            return GetSolutionName(Directory.GetFiles(dir, "*.sln*"), onError);
+        }
+
+        public static string GetSolutionName(string[] files, Action<string> onError)
+        {
+            string[] filteredFiles = [.. files.Where(f => f.EndsWith(".slnx"))];
+            if (filteredFiles.Length == 0)
             {
-                files = Directory.GetFiles(dir, "*.sln");
+                filteredFiles = [.. files.Where(f => f.EndsWith(".sln"))];
             }
 
-            if (files.Length > 1)
+            if (filteredFiles.Length > 0)
             {
-                if (files.Length == 1)
+                if (filteredFiles.Length == 1)
                 {
-                    return Path.GetFileNameWithoutExtension(files[0]);
+                    return Path.GetFileNameWithoutExtension(filteredFiles[0]);
                 }
-                if (files.Length > 1)
+                if (filteredFiles.Length > 1)
                 {
                     onError("Too many _solutions_ found. Please make sure, there is only one solution.");
                     return "";

src/Moryx.Cli.Templates/Solution.cs

@@ -0,0 +1,85 @@
+using Moq;
+using Moryx.Cli.Templates;
+using Moryx.Cli.Templates.Models;
+using static Microsoft.CodeAnalysis.CSharp.SyntaxTokenParser;
+
+namespace Moryx.Cli.Tests.Templates.SolutionTests
+{
+    public class SolutionTests
+    {
+        private const string SlnFilename = "Project1.sln";
+        private const string SlnxFilename = "Project1x.slnx";
+        private TemplateConfiguration _templateConfiguration = new();
+        private Template _template;
+
+        [SetUp]
+        public void Setup()
+        {
+            var settingsMock = new Mock<TemplateSettings>();
+            settingsMock.SetupGet(m => m.SourceDirectory).Returns(DummyFileList.SourceDir());
+        }
+
+        [Test]
+        public void SingleSlnFileWillReturnFilename()
+        {
+            string[] files = [SlnFilename, "Class1.cs"];
+            
+            var result = Solution.GetSolutionName(files, Assert.Fail);
+
+            Assert.That(result, Is.EqualTo("Project1"));
+        }
+
+        [Test]
+        public void SingleSlnxFileWillReturnFilename()
+        {
+            string[] files = [SlnxFilename, "Class1.cs"];
+
+            var result = Solution.GetSolutionName(files, Assert.Fail);
+
+            Assert.That(result, Is.EqualTo("Project1x"));
+        }
+
+        [Test]
+        public void SingleSlnAndSingleSlnxCanCoexistPrioritizingSlnx()
+        {
+            string[] files = [SlnxFilename, SlnFilename];
+
+            var result = Solution.GetSolutionName(files, Assert.Fail);
+
+            Assert.That(result, Is.EqualTo("Project1x"));
+        }
+
+        [Test]
+        public void MultipleSlnFilesWillResultInError()
+        {
+            string[] files = [SlnFilename, "Project2.sln", "Project3.sln"];
+            var errorDelegate = new Mock<Action<string>>();
+
+            var result = Solution.GetSolutionName(files, errorDelegate.Object);
+
+            errorDelegate.Verify(m => m("Too many _solutions_ found. Please make sure, there is only one solution."), Times.Once);
+        }
+
+        [Test]
+        public void MultipleSlnxFilesWillResultInError()
+        {
+            string[] files = [SlnxFilename, "Project2.slnx", "Project3.slnx"];
+            var errorDelegate = new Mock<Action<string>>();
+
+            var result = Solution.GetSolutionName(files, errorDelegate.Object);
+
+            errorDelegate.Verify(m => m("Too many _solutions_ found. Please make sure, there is only one solution."), Times.Once);
+        }
+
+        [Test]
+        public void NoSlnOrSlnxFilesWillResultInError()
+        {
+            string[] files = ["Class1.cs", "Class2.cs"];
+            var errorDelegate = new Mock<Action<string>>();
+
+            var result = Solution.GetSolutionName(files, errorDelegate.Object);
+
+            errorDelegate.Verify(m => m("No _solutions_ found. Please make sure, there is a VisualStudio solution in this directory."), Times.Once);
+        }
+    }
+}