Issue #34: handle worktree roots in live smoke tests

src/MxGateway.IntegrationTests/IntegrationTestEnvironment.cs

@@ -37,7 +37,7 @@ public static class IntegrationTestEnvironment
             return Path.GetFullPath(configuredPath);
         }
 
-        string repositoryRoot = ResolveRepositoryRoot();
+        string repositoryRoot = ResolveRepositoryRoot(AppContext.BaseDirectory);
         string[] candidatePaths =
         [
             Path.Combine(repositoryRoot, "src", "MxGateway.Worker", "bin", "x86", "Debug", "net48", "MxGateway.Worker.exe"),
@@ -74,12 +74,13 @@ public static class IntegrationTestEnvironment
         return defaultValue;
     }
 
-    private static string ResolveRepositoryRoot()
+    internal static string ResolveRepositoryRoot(string startDirectory)
     {
-        DirectoryInfo? directory = new(AppContext.BaseDirectory);
+        DirectoryInfo? directory = new(startDirectory);
         while (directory is not null)
         {
-            if (Directory.Exists(Path.Combine(directory.FullName, ".git"))
+            if ((Directory.Exists(Path.Combine(directory.FullName, ".git"))
+                    || File.Exists(Path.Combine(directory.FullName, ".git")))
                 && Directory.Exists(Path.Combine(directory.FullName, "src")))
             {
                 return directory.FullName;

src/MxGateway.IntegrationTests/IntegrationTestEnvironmentTests.cs

@@ -17,4 +17,29 @@ public sealed class IntegrationTestEnvironmentTests
             "MXGATEWAY_LIVE_MXACCESS_WORKER_EXE",
             IntegrationTestEnvironment.LiveMxAccessWorkerExecutableVariableName);
     }
+
+    [Fact]
+    public void ResolveRepositoryRoot_AcceptsGitWorktreeFile()
+    {
+        string temporaryRoot = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
+        string nestedDirectory = Path.Combine(temporaryRoot, "tests", "bin");
+
+        try
+        {
+            Directory.CreateDirectory(nestedDirectory);
+            Directory.CreateDirectory(Path.Combine(temporaryRoot, "src"));
+            File.WriteAllText(Path.Combine(temporaryRoot, ".git"), "gitdir: ../.git/worktrees/test");
+
+            string repositoryRoot = IntegrationTestEnvironment.ResolveRepositoryRoot(nestedDirectory);
+
+            Assert.Equal(temporaryRoot, repositoryRoot);
+        }
+        finally
+        {
+            if (Directory.Exists(temporaryRoot))
+            {
+                Directory.Delete(temporaryRoot, recursive: true);
+            }
+        }
+    }
 }