Make tests pass on both Linux and Windows

src/ChiselTask.cs

@@ -131,12 +131,13 @@ public override bool Execute()
             var graphPath = Path.Combine(IntermediateOutputPath, Graph);
             try
             {
-                using var output = new FileStream(graphPath, FileMode.Create);
                 if (!Enum.TryParse<GraphDirection>(GraphDirection, ignoreCase: true, out var graphDirection))
                 {
                     Log.LogWarning($"The ChiselGraphDirection property ({GraphDirection}) must be either {nameof(Chisel.GraphDirection.LeftToRight)} or {nameof(Chisel.GraphDirection.TopToBottom)}");
                 }
-                graph.Write(output, graphDirection);
+                using var graphStream = new FileStream(graphPath, FileMode.Create);
+                using var writer = new StreamWriter(graphStream);
+                graph.Write(writer, graphDirection);
                 GraphPath = [ new TaskItem(graphPath) ];
             }
             catch (Exception exception)

src/DependencyGraph.cs

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Text;
 using NuGet.ProjectModel;
 
 namespace Chisel;
@@ -151,12 +150,10 @@ private void Restore(Package package, HashSet<Package> excludePackages)
         }
     }
 
-    public void Write(Stream stream, GraphDirection graphDirection = GraphDirection.LeftToRight, bool writeIgnoredPackages = false)
+    public void Write(TextWriter writer, GraphDirection graphDirection = GraphDirection.LeftToRight, bool writeIgnoredPackages = false)
     {
         bool FilterIgnored(Package package) => writeIgnoredPackages || package.State != PackageState.Ignore;
 
-        using var writer = new StreamWriter(stream, encoding: Encoding.UTF8, bufferSize: -1, leaveOpen: true);
-
         writer.WriteLine("# Generated by https://github.com/0xced/Chisel");
         writer.WriteLine("digraph");
         writer.WriteLine("{");

tests/DependencyGraphTest.cs

@@ -17,14 +17,14 @@ public async Task Graph01(bool writeIgnoredPackages)
         var assetsFile = GetAssetsPath("Graph01.json");
         var graph = new DependencyGraph(assetsFile, tfm: "net8.0", rid: "", [ "Testcontainers.MongoDb" ]);
         var (removed, notFound, removedRoots) = graph.Remove([ "MongoDB.Driver", "AWSSDK.SecurityToken" ]);
-        using var stream = new MemoryStream();
-        graph.Write(stream, GraphDirection.LeftToRight, writeIgnoredPackages);
+        await using var writer = new StringWriter();
+        graph.Write(writer, GraphDirection.LeftToRight, writeIgnoredPackages);
 
         removed.Should().BeEquivalentTo("AWSSDK.SecurityToken", "AWSSDK.Core");
         notFound.Should().BeEmpty();
         removedRoots.Should().BeEquivalentTo("MongoDB.Driver");
 
-        await Verify(stream, "gv").UseParameters(writeIgnoredPackages);
+        await Verify(writer.ToString(), "gv").UseParameters(writeIgnoredPackages);
     }
 
     private static string GetAssetsPath(string file, [CallerFilePath] string path = "")

tests/Initialization.cs

@@ -0,0 +1,10 @@
+using System.Runtime.CompilerServices;
+using EmptyFiles;
+
+namespace Chisel.Tests;
+
+public static class Initialization
+{
+    [ModuleInitializer]
+    public static void Initialize() => FileExtensions.AddTextExtension("gv");
+}