refactor: improve code organization and error handling

CodeLineCounter.Tests/CodeAnalyzerTests.cs

@@ -12,7 +12,7 @@ public void TestAnalyzeSolution()
             var solutionPath = Path.GetFullPath(Path.Combine(basePath, "..", "..", "..", "..", "CodeLineCounter.sln"));
 
             // Act
-            var (metrics, projectTotals, totalLines, totalFiles, duplicationMap) = CodeAnalyzer.AnalyzeSolution(solutionPath);
+            var (metrics, projectTotals, totalLines, totalFiles, duplicationMap) = CodeMetricsAnalyzer.AnalyzeSolution(solutionPath);
 
             // Assert
             Assert.NotNull(metrics);
@@ -37,7 +37,7 @@ public void AnalyzeSourceCode_Should_Set_CurrentNamespace()
             };
 
             // Act
-            CodeAnalyzer.AnalyzeSourceCode(projectNamespaceMetrics, lines, out string? currentNamespace, out _, out _);
+            CodeMetricsAnalyzer.AnalyzeSourceCode(projectNamespaceMetrics, lines, out string? currentNamespace, out _, out _);
 
             // Assert
             Assert.Equal("MyNamespace", currentNamespace);
@@ -57,7 +57,7 @@ public void AnalyzeSourceCode_Should_Set_FileLineCount()
             };
 
             // Act
-            CodeAnalyzer.AnalyzeSourceCode(projectNamespaceMetrics, lines, out _, out int fileLineCount, out _);
+            CodeMetricsAnalyzer.AnalyzeSourceCode(projectNamespaceMetrics, lines, out _, out int fileLineCount, out _);
 
             // Assert - 3 lines only because comment lines are ignored
             Assert.Equal(3, fileLineCount);
@@ -77,7 +77,7 @@ public void AnalyzeSourceCode_Should_Set_FileCyclomaticComplexity()
             };
 
             // Act
-            CodeAnalyzer.AnalyzeSourceCode(projectNamespaceMetrics,  lines, out _, out _, out int fileCyclomaticComplexity);
+            CodeMetricsAnalyzer.AnalyzeSourceCode(projectNamespaceMetrics,  lines, out _, out _, out int fileCyclomaticComplexity);
 
             // Assert
             Assert.Equal(1, fileCyclomaticComplexity);

CodeLineCounter.Tests/CodeDuplicationCheckerTests.cs

@@ -1,8 +1,4 @@
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 using CodeLineCounter.Services;
-using Xunit;
 
 namespace CodeLineCounter.Tests
 {

CodeLineCounter.Tests/CoreUtilsTests.cs

@@ -59,6 +59,57 @@ public void ParseArguments_Should_Ignore_Invalid_Arguments()
             Assert.Equal("testDirectory", DirectoryPath);
         }
 
+        // ParseArguments correctly processes valid command line arguments with all options
+        [Fact]
+        public void ParseArguments_processes_valid_arguments_with_all_options()
+        {
+            // Arrange
+            string[] args = new[] { "-verbose", "-d", "C:/test", "-format", "JSON", "-help" };
+
+            // Act
+            var result = CoreUtils.ParseArguments(args);
+
+            // Assert
+            Assert.True(result.Verbose);
+            Assert.Equal("C:/test", result.DirectoryPath);
+            Assert.True(result.Help);
+            Assert.Equal(CoreUtils.ExportFormat.JSON, result.format);
+        }
+
+        // ParseArguments handles empty or null argument array
+        [Fact]
+        public void ParseArguments_handles_empty_argument_array()
+        {
+            // Arrange
+            string[] emptyArgs = Array.Empty<string>();
+
+            // Act
+            var result = CoreUtils.ParseArguments(emptyArgs);
+
+            // Assert
+            Assert.False(result.Verbose);
+            Assert.Null(result.DirectoryPath);
+            Assert.False(result.Help);
+            Assert.Equal(CoreUtils.ExportFormat.CSV, result.format);
+        }
+
+        // ParseArguments processes invalid format option gracefully
+        [Fact]
+        public void ParseArguments_handles_invalid_format_option()
+        {
+            // Arrange
+            string[] args = new[] { "-format", "INVALID" };
+            var consoleOutput = new StringWriter();
+            Console.SetOut(consoleOutput);
+
+            // Act
+            var result = CoreUtils.ParseArguments(args);
+
+            // Assert
+            Assert.Equal(CoreUtils.ExportFormat.CSV, result.format);
+            Assert.Contains("Invalid format", consoleOutput.ToString());
+        }
+
         [Fact]
         public void GetUserChoice_Should_Return_Valid_Choice()
         {
@@ -91,6 +142,39 @@ public void GetUserChoice_Should_Return_Invalid_Choice()
             Assert.Equal(-1, result);
         }
 
+        // GetUserChoice returns valid selection when input is within range
+        [Fact]
+        public void GetUserChoice_returns_valid_selection_for_valid_input()
+        {
+            // Arrange
+            var input = "2";
+            var consoleInput = new StringReader(input);
+            Console.SetIn(consoleInput);
+
+            // Act
+            int result = CoreUtils.GetUserChoice(3);
+
+            // Assert
+            Assert.Equal(2, result);
+        }
+
+        [Theory]
+        [InlineData("")]
+        [InlineData(" ")]
+        [InlineData("abc")]
+        public void GetUserChoice_handles_invalid_input(string input)
+        {
+            // Arrange
+            var consoleInput = new StringReader(input);
+            Console.SetIn(consoleInput);
+
+            // Act
+            int result = CoreUtils.GetUserChoice(5);
+
+            // Assert
+            Assert.Equal(-1, result);
+        }
+
         [Fact]
         public void DisplaySolutions_Should_Write_Solutions_To_Console()
         {
@@ -204,5 +288,21 @@ public void CheckSettings_WhenSettingsAreInvalid_ReturnsFalse()
             // Assert
             Assert.False(result);
         }
+
+        [Theory]
+        [InlineData("CO.Solution.Build-CodeMetrics.txt", CoreUtils.ExportFormat.CSV)]
+        [InlineData("CO.Solution.Build-CodeDuplications.json", CoreUtils.ExportFormat.JSON)]
+        [InlineData("CO.Solution.Build-CodeMetrics.", CoreUtils.ExportFormat.CSV)]
+        [InlineData("CO.Solution.Build-CodeDuplications.²", CoreUtils.ExportFormat.JSON)]
+        [InlineData("metrics_789.csv", CoreUtils.ExportFormat.CSV)]
+        public void get_export_file_name_with_extension_handles_alphanumeric(string fileName, CoreUtils.ExportFormat format)
+        {
+            // Act
+            var result = CoreUtils.GetExportFileNameWithExtension(fileName, format);
+
+            // Assert
+            Assert.Contains(Path.GetFileNameWithoutExtension(fileName), result);
+            Assert.True(File.Exists(result) || !File.Exists(result));
+        }
     }
 }

CodeLineCounter.Tests/CsvHandlerTests.cs

@@ -1,9 +1,3 @@
-using System.Collections.Generic;
-using System.Globalization;
-using System.IO;
-using CsvHelper;
-using System.Linq;
-using Xunit;
 using CodeLineCounter.Utils;
 
 namespace CodeLineCounter.Tests

CodeLineCounter.Tests/DataExporterTests.cs

@@ -1,10 +1,5 @@
-using Xunit;
-using System;
-using System.IO;
-using System.Collections.Generic;
 using CodeLineCounter.Models;
 using CodeLineCounter.Utils;
-using System.Linq;
 
 namespace CodeLineCounter.Tests
 {

CodeLineCounter.Tests/SolutionAnalyzerTests.cs

@@ -0,0 +1,113 @@
+using CodeLineCounter.Services;
+using CodeLineCounter.Models;
+using CodeLineCounter.Utils;
+
+namespace CodeLineCounter.Tests.Services
+{
+    public class SolutionAnalyzerTest
+    {
+
+        [Fact]
+        public void PerformAnalysis_ShouldReturnCorrectAnalysisResult()
+        {
+            // Arrange
+            var basePath = FileUtils.GetBasePath();
+            var solutionPath = Path.GetFullPath(Path.Combine(basePath, "..", "..", "..", ".."));
+            solutionPath = Path.Combine(solutionPath, "CodeLineCounter.sln");
+
+            // Act
+            var result = SolutionAnalyzer.PerformAnalysis(solutionPath);
+
+            // Assert
+            Assert.NotNull(result);
+            Assert.Equal("CodeLineCounter.sln", result.SolutionFileName);
+        }
+
+        [Fact]
+        public void OutputAnalysisResults_ShouldPrintCorrectOutput()
+        {
+            // Arrange
+            var result = new SolutionAnalyzer.AnalysisResult
+            {
+                Metrics = new List<NamespaceMetrics>(),
+                ProjectTotals = new Dictionary<string, int>(),
+                TotalLines = 1000,
+                TotalFiles = 10,
+                DuplicationMap = new List<DuplicationCode>(),
+                ProcessingTime = TimeSpan.FromSeconds(10),
+                SolutionFileName = "CodeLineCounter.sln",
+                DuplicatedLines = 100
+            };
+            var verbose = true;
+
+            using (var sw = new StringWriter())
+            {
+                Console.SetOut(sw);
+
+                // Act
+                SolutionAnalyzer.OutputAnalysisResults(result, verbose);
+
+                // Assert
+                var output = sw.ToString();
+                Assert.Contains("Processing completed, number of source files processed: 10", output);
+                Assert.Contains("Total lines of code: 1000", output);
+                Assert.Contains("Solution CodeLineCounter.sln has 100 duplicated lines of code.", output);
+                Assert.Contains("Percentage of duplicated code: 10.00 %", output);
+                Assert.Contains("Time taken: 0:10.000", output);
+            }
+        }
+
+        [Fact]
+        public void OutputDetailedMetrics_ShouldPrintMetricsAndProjectTotals()
+        {
+            // Arrange
+            var metrics = new List<NamespaceMetrics>
+            {
+                new NamespaceMetrics
+                {
+                    ProjectName = "Project1",
+                    ProjectPath = "/path/to/project1",
+                    NamespaceName = "Namespace1",
+                    FileName = "File1.cs",
+                    FilePath = "/path/to/project1/File1.cs",
+                    LineCount = 100,
+                    CyclomaticComplexity = 10
+                },
+                new NamespaceMetrics
+                {
+                    ProjectName = "Project2",
+                    ProjectPath = "/path/to/project2",
+                    NamespaceName = "Namespace2",
+                    FileName = "File2.cs",
+                    FilePath = "/path/to/project2/File2.cs",
+                    LineCount = 200,
+                    CyclomaticComplexity = 20
+                }
+            };
+
+            var projectTotals = new Dictionary<string, int>
+            {
+                { "Project1", 100 },
+                { "Project2", 200 }
+            };
+
+            using (var sw = new StringWriter())
+            {
+                Console.SetOut(sw);
+
+                // Act
+                SolutionAnalyzer.OutputDetailedMetrics(metrics, projectTotals);
+
+                // Assert
+                var expectedOutput = 
+                    $"Project Project1 (/path/to/project1) - Namespace Namespace1 in file File1.cs (/path/to/project1/File1.cs) has 100 lines of code and a cyclomatic complexity of 10.{Environment.NewLine}" +
+                    $"Project Project2 (/path/to/project2) - Namespace Namespace2 in file File2.cs (/path/to/project2/File2.cs) has 200 lines of code and a cyclomatic complexity of 20.{Environment.NewLine}" +
+                    $"Project Project1 has 100 total lines of code.{Environment.NewLine}" +
+                    $"Project Project2 has 200 total lines of code.{Environment.NewLine}";
+
+                Assert.Equal(expectedOutput, sw.ToString());
+            }
+        }
+
+    }
+}

CodeLineCounter/Models/DuplicationCode.cs

@@ -15,5 +15,27 @@ public class DuplicationCode
         [Name("NbLines")]
         public int NbLines { get; set; }  
     }
+
+    public class DuplicationInfo
+    {
+        [Name("Source File")]
+        public required string SourceFile { get; set; }
+        [Name("Start Line")]
+        public int StartLine { get; set; }
+        [Name("Nb Lines")]
+        public int NbLines { get; set; }
+        [Name("Duplicated Code")]
+        public required string DuplicatedCode { get; set; }
+        [Name("Duplicated In")]
+        public required List<DuplicationLocation> Duplicates { get; set; }
+    }
+
+    public class DuplicationLocation
+    {
+        [Name("File Path")]
+        public required string FilePath { get; set; }
+        [Name("Start Line")]
+        public int StartLine { get; set; }
+    }
 }