Use UTF8 a default encoding

Author: NikolayPianikov

CSharpInteractive/BuildContext.cs

@@ -83,7 +83,6 @@ private IEnumerable<BuildMessage> OnTestFinished(IServiceMessage message)
         {
             duration = TimeSpan.FromMilliseconds(durationMs);
         }
-
 
         _tests.Add(BuildMessage.CreateResult(testKey, message, TestState.Finished).WithDuration(duration).WithOutput(ctx.Output));
     }
@@ -191,23 +190,26 @@ private static BuildMessage CreateMessage(IServiceMessage message, BuildMessageS
 
     private TestContext GetTestContext(BuildMessage.TestKey testKey, bool remove = false)
     {
-        if (!_currentTests.TryGetValue(testKey, out var testContext))
+        lock (_currentTests)
         {
-            testContext = new TestContext();
-            if (!remove)
+            if (!_currentTests.TryGetValue(testKey, out var testContext))
             {
-                _currentTests.Add(testKey, testContext);
+                testContext = new TestContext();
+                if (!remove)
+                {
+                    _currentTests.Add(testKey, testContext);
+                }
             }
-        }
-        else
-        {
-            if (remove)
+            else
             {
-                _currentTests.Remove(testKey);
+                if (remove)
+                {
+                    _currentTests.Remove(testKey);
+                }
             }
+            
+            return testContext;
         }
-
-        return testContext;
     }
 
     private class TestContext

CSharpInteractive/ProcessRunner.cs

@@ -17,7 +17,6 @@ public ProcessResult Run(ProcessInfo processInfo, TimeSpan timeout)
         }
 
         var finished = processManager.WaitForExit(timeout);
-
         return process.Finish(finished);
     }
 

CSharpInteractive/StartInfoFactory.cs

@@ -2,6 +2,7 @@
 namespace CSharpInteractive;
 
 using System.Diagnostics;
+using System.Text;
 using HostApi;
 
 internal class StartInfoFactory(
@@ -27,7 +28,9 @@ public ProcessStartInfo Create(IStartInfo info)
             UseShellExecute = false,
             CreateNoWindow = true,
             RedirectStandardOutput = true,
-            RedirectStandardError = true
+            RedirectStandardError = true,
+            StandardErrorEncoding = Encoding.UTF8,
+            StandardOutputEncoding = Encoding.UTF8
         };
 
         log.Trace(() => [new Text($"File name: \"{startInfo.FileName}\".")], description);

Samples/MySampleLib/Build/Program.cs

@@ -23,22 +23,7 @@
     .WithShortName("Tests")
     .WithNoBuild(true)
     .WithConfiguration(configuration)
-    .Build(i =>
-    {
-        if (i.TestResult is { } testResult)
-        {
-            switch (testResult.State)
-            {
-                case TestState.Failed:
-                    Error($"{testResult.FullyQualifiedName}: {testResult.State}");
-                    break;
-                
-                case TestState.Ignored:
-                    Warning($"{testResult.FullyQualifiedName}: {testResult.State}");
-                    break;
-            }
-        }
-    });
+    .Build();
 
 if (testResult.ExitCode != 0)
 {