Support additional files

src/Exercism.TestRunner.CSharp/FilesParser.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text.Json;
@@ -11,9 +12,22 @@ internal static class FilesParser
         public static Files Parse(Options options)
         {
             var configuration = JsonSerializer.Deserialize<Configuration>(ConfigJson(options));
-            return configuration!.Files;
+            configuration.Files.Additional = GetAdditionalFiles(options, configuration);
+            return configuration.Files;
         }
 
+        private static string[] GetAdditionalFiles(Options options, Configuration configuration) =>
+            Directory.EnumerateFiles(options.InputDirectory, "*.cs", SearchOption.AllDirectories)
+                .Select(Path.GetFullPath)
+                .Select(path => path[options.InputDirectory.Length..].TrimStart(Path.DirectorySeparatorChar))
+                .Except(configuration.Files.Solution)
+                .Except(configuration.Files.Editor)
+                .Except(configuration.Files.Test)
+                .Except(configuration.Files.Example)
+                .Except(configuration.Files.Exemplar)
+                .Where(path => !Path.GetDirectoryName(path)!.StartsWith('.'))
+                .ToArray();
+
         private static string ConfigJson(Options options) =>
             File.ReadAllText(options.ConfigJsonPath());
 
@@ -35,6 +49,15 @@ internal class Files
 
         [JsonPropertyName("editor")]
         public string[] Editor { get; set; } = Array.Empty<string>();
+
+        [JsonPropertyName("example")]
+        public string[] Example { get; set; } = Array.Empty<string>();
+
+        [JsonPropertyName("exemplar")]
+        public string[] Exemplar { get; set; } = Array.Empty<string>();
+
+        [JsonIgnore]
+        public string[] Additional { get; set; } = Array.Empty<string>();
     }
 
     internal class Configuration

src/Exercism.TestRunner.CSharp/TestCompilation.cs

@@ -23,8 +23,9 @@ private static IEnumerable<SyntaxTree> SyntaxTrees(Options options, Files files)
             var solutionFiles = files.Solution.Select(file => ParseSyntaxTree(file, options));
             var editorFiles = files.Editor.Select(file => ParseSyntaxTree(file, options));
             var testFiles = files.Test.Select(file => ParseSyntaxTree(file, options).Rewrite());
+            var additionalFiles = files.Additional.Select(file => ParseSyntaxTree(file, options));
 
-            return solutionFiles.Concat(editorFiles).Concat(testFiles);
+            return solutionFiles.Concat(editorFiles).Concat(testFiles).Concat(additionalFiles);
         }
 
         private static SyntaxTree ParseSyntaxTree(string file, Options options)

tests/AdditionalFiles/.meta/config.json

@@ -0,0 +1,7 @@
+{
+  "files": {
+    "solution": ["Fake.cs"],
+    "test": ["FakeTests.cs"],
+    "example": [".meta/Example.cs"]
+  }
+}

tests/AdditionalFiles/Fake.cs

@@ -0,0 +1,4 @@
+public static class Fake
+{
+    public static int Add(int x, int y) => Helper.Add(x, y);
+}

tests/AdditionalFiles/Fake.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="Example.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
+    <PackageReference Include="Exercism.Tests" Version="0.1.0-alpha" />
+  </ItemGroup>
+
+</Project>

tests/AdditionalFiles/FakeTests.cs

@@ -0,0 +1,6 @@
+using Xunit;
+public class FakeTests
+{
+    [Fact]
+    public void Add_should_add_numbers() => Assert.Equal(2, Fake.Add(1, 1));
+}

tests/AdditionalFiles/Helper.cs

@@ -0,0 +1,4 @@
+public static class Helper
+{
+    public static int Add(int x, int y) => x + y;
+}

tests/AdditionalFiles/expected_results.json

@@ -0,0 +1,11 @@
+{
+  "version": 3,
+  "status": "pass",
+  "tests": [
+    {
+      "name": "Add should add numbers",
+      "status": "pass",
+      "test_code": "Assert.Equal(2, Fake.Add(1, 1))"
+    }
+  ]
+}