fix: correct test assertion on CLI incoming

Author: Spelkington

examples/advanced/KedroSpaceflights.Custom/Program.cs

@@ -94,6 +94,8 @@ private static void ConfigureServices(IServiceCollection services, string basePa
       flowthru
         .RegisterFlow(label: "Reporting", flow: ReportingFlow.Create)
         .WithDescription("Generates reports and visualizations");
+
+      flowthru.ConfigureExecution(opts => opts.MaxDegreeOfParallelism = 8);
     });
 
     services.AddLogging(logging =>

tests/Flowthru.Tests/05_Cli/ArgumentParserParallelismTests.cs

@@ -53,11 +53,13 @@ public void Parse_ParallelismAuto_SetsMaxDegreeToProcessorCount(string token)
   // ─────────────────────────────────────────────────────────────────────────
 
   [Test]
-  public void Parse_NoParallelismFlag_DefaultsToOne()
+  public void Parse_NoParallelismFlag_LeavesNull()
   {
     var parsed = ArgumentParser.Parse([], NoFlows);
 
-    Assert.That(parsed.Options!.MaxDegreeOfParallelism, Is.EqualTo(1));
+    // Null means "unspecified" — the priority chain in FlowthruService resolves it
+    // to the service-level default, or 1 if none is configured.
+    Assert.That(parsed.Options!.MaxDegreeOfParallelism, Is.Null);
   }
 
   // ─────────────────────────────────────────────────────────────────────────