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I have tests like that. Negative unit testing.
Does this test make sense? Is it not better to test only the expected exceptional scenarios?
[Test]
public void Get_Root_Units_By_Non_Existing_TemplateId()
{
// ARRANGE
ITemplateUnitDataProvider provider = new TemplateUnitDataProvider(_connectionString);
int templateId = -1;
// ACT
var units = provider.GetRootUnits(templateId);
// ASSERT
Assert.IsNotNull(units);
Assert.Count(0, units);
}
For me this test makes sense. You are checking that the SUT (Subject Under Test) returns an empty array if it hasn’t found any records matching the input parameter.