dotnet/maui · error · Exception

No test results found.

Error message

No test results found.

What it means

Thrown inside HandleTestResults when needsNameFix is true (iOS/catalyst runs) and GetFiles for xunit-test-*.xml in the results directory yields no match. XHarness writes its xUnit XML to a file named xunit-test-<timestamp>.xml; absence means the test runner never reached the result-writing stage.

Source

Thrown at eng/devices/devices-shared.cake:247

		{
			values.Add($"Category={(string)field.GetValue(null)}");
		}
	}
	
	return values.ToList();
}

void HandleTestResults(string resultsDir, bool testsFailed, bool needsNameFix, string suffix = null)
{
    Information($"Handling test results: {resultsDir}");

    // catalyst and ios test result files are weirdly named, so fix it up
    if(needsNameFix)
    {
        var resultsFile = GetFiles($"{resultsDir}/xunit-test-*.xml").FirstOrDefault();
        if (resultsFile == null)
        {
            throw new Exception("No test results found.");
        }
        
        if (FileExists(resultsFile))
        {
            Information($"Test results found on {resultsDir}");
            MoveFile(resultsFile, resultsFile.GetDirectory().CombineWithFilePath($"testResults{suffix}.xml"));
            var logFiles = GetFiles($"{resultsDir}/*.log");

            foreach (var logFile in logFiles)
            {
                if (logFile.GetFilename().ToString().StartsWith("testResults"))
                {
                    // These are log files that have already been renamed
                    continue;
                }

                Information($"Log file found: {logFile.GetFilename().ToString()}");
                MoveFile(logFile, resultsFile.GetDirectory().CombineWithFilePath($"testResults{suffix}-{logFile.GetFilename()}"));

View on GitHub (pinned to f377ff1c5e)

Solutions

1. Inspect the *.log files and xharness stdout in resultsDir for the real failure (boot timeout, install error, crash) — the missing XML is a symptom, not the cause.
2. Verify resultsDir matches the --output-directory passed to xharness apple test; mismatched paths are the most common cause.
3. Re-run with a clean results dir to rule out a leftover file with a different name pattern from a previous run.
4. Increase the xharness --launch-timeout if logs show the app started but never finished writing results.

Example fix

// before
var resultsFile = GetFiles($"{resultsDir}/xunit-test-*.xml").FirstOrDefault();
if (resultsFile == null)
    throw new Exception("No test results found.");

// after: surface what *is* in the dir so the failure is diagnosable
var resultsFile = GetFiles($"{resultsDir}/xunit-test-*.xml").FirstOrDefault();
if (resultsFile == null)
{
    var contents = string.Join(", ", GetFiles($"{resultsDir}/*").Select(f => f.GetFilename().ToString()));
    throw new Exception($"No test results found in {resultsDir}. Contents: {contents}");
}

// Before HandleTestResults, confirm xharness wrote output
var candidate = GetFiles($"{resultsDir}/xunit-test-*.xml");
if (needsNameFix && (candidate == null || !candidate.Any()))
{
    var dump = string.Join(", ", GetFiles($"{resultsDir}/*").Select(f => f.GetFilename().ToString()));
    throw new Exception($"XHarness produced no results in {resultsDir}. Dir contents: {dump}");
}

When it happens

Trigger: Calling HandleTestResults after an iOS/catalyst xharness run that crashed, timed out, or was killed before emitting results; passing a resultsDir that points at the wrong folder; the runner writing to a sibling directory because --output-directory was set differently; a prior step deleting the results dir.

Common situations: Simulator boot failure causing xharness to exit before tests start; app install failure on the simulator; a stale results dir from a previous run that was partially cleaned; CI reruns where the results dir path changed between matrix legs.

Related errors

• No device was found to install the app on. See the Setup met
• No device was found to run tests on.
• No simulator was found to run tests on.
• No devices found
• No devices found for version {version}

AI-assisted analysis of dotnet/maui@f377ff1c5e (2026-08-13). Data as JSON: /api/errors/c80c28031f0f429a. Report an issue: GitHub.