/// <summary>
/// Finds the tests on a test method.
/// </summary>
/// <param name="testMethod">The test method.</param>
/// <param name="messageBus">The message bus to report discovery messages to.</param>
/// <param name="discoveryOptions">The options used by the test framework during discovery.</param>
/// <returns>Return <c>true</c> to continue test discovery, <c>false</c>, otherwise.</returns>
protected internal virtual bool FindTestsForMethod(
_ITestMethod testMethod,
IMessageBus messageBus,
_ITestFrameworkDiscoveryOptions discoveryOptions)
{
var includeSourceInformation = discoveryOptions.IncludeSourceInformationOrDefault();
var factAttributes = testMethod.Method.GetCustomAttributes(typeof(FactAttribute)).CastOrToList();
if (factAttributes.Count > 1)
{
var message = $"Test method '{testMethod.TestClass.Class.Name}.{testMethod.Method.Name}' has multiple [Fact]-derived attributes";
var testCase = new ExecutionErrorTestCase(DiagnosticMessageSink, TestMethodDisplay.ClassAndMethod, TestMethodDisplayOptions.None, testMethod, message);
return(ReportDiscoveredTestCase(testCase, includeSourceInformation, messageBus));
}
var factAttribute = factAttributes.FirstOrDefault();
if (factAttribute == null)
{
return(true);
}
var factAttributeType = (factAttribute as _IReflectionAttributeInfo)?.Attribute.GetType();
Type?discovererType = null;
if (factAttributeType == null || !DiscovererTypeCache.TryGetValue(factAttributeType, out discovererType))
{
var testCaseDiscovererAttribute = factAttribute.GetCustomAttributes(typeof(XunitTestCaseDiscovererAttribute)).FirstOrDefault();
if (testCaseDiscovererAttribute != null)
{
discovererType = ExtensibilityPointFactory.TypeFromAttributeConstructor(testCaseDiscovererAttribute);
}
if (factAttributeType != null)
{
DiscovererTypeCache[factAttributeType] = discovererType;
}
}
if (discovererType == null)
{
return(true);
}
var discoverer = GetDiscoverer(discovererType);
if (discoverer == null)
{
return(true);
}
foreach (var testCase in discoverer.Discover(discoveryOptions, testMethod, factAttribute))
{
if (!ReportDiscoveredTestCase(testCase, includeSourceInformation, messageBus))
{
return(false);
}
}
return(true);
}