Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Python Testing Be Assertive assertIn

Posted by Rungano Matonda
Rungano Matonda
3,237 Points

Add a new test named test_not_in_anagrams and use self.assertNotIn to make sure"code" isn't the anagrams for "treehouse"

Getting confused, need help from anyone please help:(

tests.py 
import unittest

from string_fun import get_anagrams


class AnagramTestCase(unittest.TestCase):
     def test_nit_in_anagrams(self):
       with self.assertNotIn(code):
          get_anagrams('Treehouse')
string_fun.py 
import itertools


def is_palindrome(yarn):
    """Return whether or not a string is a palindrome.

    A palindrome is a word/phrase that's the same in
    both directions.
    """
    return yarn == yarn[::-1]


def get_anagrams(*yarn):
    """Return a list of anagrams for a string."""
    # If only one letter came in, return it
    if yarn:
        if len(yarn[0]) <= 1:
            return list(yarn)
    else:
        raise ValueError("Must provide at least two letters")

    # Get all of the words from the dictionary
    words = set([
        w.strip().lower() for w in open('words.txt')
    ])

    output = set()
    for thread in yarn:
        thread = thread.lower()
        # Find all possible anagrams
        for i in range(2, len(thread)):
            fibers = set(
                [''.join(w) for w in itertools.permutations(thread, i)]
            )
            output.update(fibers.intersection(words))

    # Finally, return all of the combinations that are in the dictionary
    return sorted(list(output))

2 Answers

Dan Johnson
Dan Johnson
40,533 Points
Dan Johnson
Dan Johnson
40,533 Points

assertRaises is what can use the keyword with to capture exceptions, assertIn and assertNotIn you'll deal with just like any other method call.

It looks like you removed the code for the first test, so you'll need to put that back in. You'll need both the test_in_anagrams and test_not_in_anagrams methods.

Rungano Matonda
Rungano Matonda
3,237 Points 
import unittest

from string_fun import get_anagrams


class AnagramTests(unittest.TestCase):
    def test_in_anagrams(self):
         self.assertIn('house', get_anagrams('Treehouse'))

    def test_empty_string(self):
        with self.assertRaises(ValueError):
          get_anagrams()

This is what i have done but it's still not working.

Dan Johnson
Dan Johnson
40,533 Points
Dan Johnson
Dan Johnson
40,533 Points

The test_empty_string and test_no_args are in a separate challenge from the test_in_anagrams and test_not_in_anagrams tests. You won't be required to port them over.

Your code for the test_empty_string method is actually what you'll want for the test_no_args method in the next part. To test against an empty string you'll want to call it like this:

def test_empty_string(self):
  with self.assertRaises(ValueError):
    get_anagrams("")
Rungano Matonda
Rungano Matonda
3,237 Points

Sorry Mr Dan, I am still confused. What exactly I am supposed to be doing. Can you please give hints or examples. I removed the the "test_not_in_anagrams" and put "test_empty_string" but it's still saying "bummer,try again"

Dan Johnson
Dan Johnson
40,533 Points
Dan Johnson
Dan Johnson
40,533 Points

I'm kinda confused as to which challenge you're working on, so I'll just go over both:

assertIn Challenge:

class AnagramTests(unittest.TestCase):
    def test_in_anagrams(self):
        self.assertIn("house", get_anagrams("Treehouse"))

    def test_not_in_anagrams(self):
        # Same structure as before but with the assertNotIn method
        # checking to make sure "code" is not in the list returned

assertRaises Challenge:

class AnagramTestCase(unittest.TestCase):
    def test_empty_string(self):
        with self.assertRaises(ValueError):
          get_anagrams("")

    def test_no_args(self):
        # Same structure as before except with no arguments passed
        # in to get_anagrams
Rungano Matonda
Rungano Matonda
3,237 Points

Thanks for the help Dan, I now get what I am supposed to be doing:)

Annie Scott
Annie Scott
27,613 Points
Annie Scott
Annie Scott
27,613 Points

Task 2

class AnagramTestCase(unittest.TestCase): def test_not_in_anagrams(self): with self.assertNotIn(('code', get_anagrams('Treehouse')): get_anagrams('Treehouse')