public void DataDiscovererReturningNullYieldsSingleTheoryTestCase()
{
var discoverer = TestableTheoryDiscoverer.Create();
var theoryAttribute = Mocks.TheoryAttribute();
var dataAttribute = Mocks.DataAttribute();
var testMethod = Mocks.TestMethod(methodAttributes: new[] { theoryAttribute, dataAttribute });
var testCases = discoverer.Discover(discoveryOptions, testMethod, theoryAttribute);
var testCase = Assert.Single(testCases);
var theoryTestCase = Assert.IsType <XunitTheoryTestCase>(testCase);
Assert.Equal("MockType.MockMethod", theoryTestCase.DisplayName);
}