Enable NUnit parallel workers using all available processors

rogeralsing · claude · rogeralsing · commit e9a05096ee1a · 2026-01-09T12:53:11.000+01:00
Pass NUnit.NumberOfTestWorkers via vstest runsettings to enable
parallel test execution within the assembly.

Co-Authored-By: Claude Opus 4.5 &lt;noreply@anthropic.com&gt;
diff --git a/src/Asynkron.TestRunner/IsolateRunner.cs b/src/Asynkron.TestRunner/IsolateRunner.cs
@@ -698,6 +698,10 @@ private async Task<BatchRunResult> RunBatchAsync(TestBatch batch, bool suppressO
                 // Add TRX logger for results parsing
                 args.Add("/logger:trx");
                 args.Add($"/ResultsDirectory:{tempDir}");
+                // Enable NUnit parallel workers (use all available processors)
+                var workerCount = Environment.ProcessorCount;
+                args.Add("--");
+                args.Add($"NUnit.NumberOfTestWorkers={workerCount}");
             }
             else
             {

Original file line number	Diff line number	Diff line change
`@@ -698,6 +698,10 @@ private async Task<BatchRunResult> RunBatchAsync(TestBatch batch, bool suppressO`
`698`	`698`	`// Add TRX logger for results parsing`
`699`	`699`	`args.Add("/logger:trx");`
`700`	`700`	`args.Add($"/ResultsDirectory:{tempDir}");`
	`701`	`+ // Enable NUnit parallel workers (use all available processors)`
	`702`	`+ var workerCount = Environment.ProcessorCount;`
	`703`	`+ args.Add("--");`
	`704`	`+ args.Add($"NUnit.NumberOfTestWorkers={workerCount}");`
`701`	`705`	`}`
`702`	`706`	`else`
`703`	`707`	`{`