assertions

If I define import Control.Exception (assert) import Data.Char (ord) f :: String -> String f s = assert (all (`elem` letters) s) $ (letters!!) <$> (ix <$> s) where ix ch = (ord ch - ord 'A') letters = ['A'..'Z'] then if I execute f "AB.CD" in IHaskell, I get :10:7-12: Assertion failed as I would expect. But in all other settings, the assertion seems to be ignored. For example in GHCi (7.10.2) I get ghci>f "AB.CD" "AB*** Exception: Prelude.!!: negative index and if I put the expression in a program main :: IO () main = do print $ f "AB.CD" I get prgm: Prelude.!!: negative index "AB Why is my

My code operates on data which "should" be correct. However during development there are occasions when I obtain invalid data. When that happens I would like to raise the debug assert and, if user choose to continue, the code would filter out the invalid records and continue to operate on "safe" data. // assert incorrect data Debug.Assert(person.Items.All(item => item.IsValid), "Inconsistent data!"); // operate on filtered data this.ItemViewModels = new ObservableCollection<ItemViewModel>( person.Items .Where(i =>item.IsValid) // Use only correct data .Select(i => new ItemViewModel(lang, i)));

i am checking a string for three characters Assert.AreEqual(myString.Substring(3,3), "DEF", "Failed as DEF was not observed"); the thing is here it can be DEF or RES , now to handle this what i can think of is the following bool check = false; if( myString.Substring(3,3) == "DEF" || myString.Substring(3,3) == "RED" ) check = true; Assert.IsTrue(check,"Failed"); Console.WriteLine(""Passed); IS THERE a way i can use some OR thing within Assert p.s i'm writing unit test & yes i will use ternary operator instead.... Assert.IsTrue((myString.Substring(3,3) == "DEF" || myString.Substring(3,3) == "RED

After submitting queries to a service, I get a dictionary / a list back and I want to make sure it's not empty. I am on Python 2.7. I am surprised I don't see any assertEmpty method for the unittest.TestCase class instance. The existing alternatives such as: self.assertTrue(bool(d)) and self.assertNotEqual(d,{}) and self.assertGreater(len(d),0) just don't look right. Is this kind of method is missing in the Python unittest framework? If yes, what would be the most pythonic way to assert that an iterable is not empty? Empty lists/dicts evaluate to False, so self.assertTrue(d) gets the job done.

My line coverage for unit tests measured by Cobertura is suffering, because I have assert statements which are not covered in tests. Should I be testing assert ions, and is there any way to get Cobertura to ignore them so they do not affect my test coverage? The line coverage of your Java assert statements should be simply covered by running your test suite with assertions enabled, i.e., giving -ea as argument to the jvm. If you do this, you'll see that cobertura easily reports 100% line coverage if the rest of your lines are covered as well. Nevertheless, the assert lines will still be