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Python Python Testing Be Assertive assertIn

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14,136 Points

Python testing challenge assertIn fail

I fail for some reason on one of the testing challenges but I'm not sure why:

The get_anagrams() function takes one or more words and returns anagrams for each of them as a list. Finish the test_in_anagrams() test to check that the anagrams for the string "treehouse" contains the word "house".

The response I get is: Bummer! Didn't find a test for get_anagrams() using self.assertIn()

tests.py
import unittest

from string_fun import get_anagrams


class AnagramTests(unittest.TestCase):
    def test_in_anagrams(self):
        self.assertIn('house', 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))
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14,136 Points

Hmmm I'm most likely repeating the same mistake as I fail the next challenge too...

"Our get_anagrams() function raises a ValueError when you pass it an empty string. Finish the test to make sure this happens. You'll want to use assertRaises."

" Bummer! Didn't find a test for get_anagrams() using self.assertRaises() and an empty string"

import unittest

from string_fun import get_anagrams


class AnagramTestCase(unittest.TestCase):
    def test_empty_string(self):
        with self.assertRaises(ValueError):
          get_anagrsms('')

6 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points

You hav a typo: "get_anagr*sms" instead of " get_anagra*ms"

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14,136 Points

Thanks that fixed the 2nd one - silly miss. I've double checked the first one but no typo that I can see. Am I using the assertIn() method incorrectly?

You have 'Treehouse' capitalized.

import unittest

from string_fun import get_anagrams

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

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14,136 Points

Doh!

Thanks - Looked at it for far too long

Test Question :

Our get_anagrams() function raises a ValueError when you pass it an empty string. Finish the test to make sure this happens. You'll want to use assertRaises.

Answer:import unittest

from string_fun import get_anagrams

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

Our get_anagrams() function raises a ValueError when you pass it an empty string. Finish the test to make sure this happens. You'll want to use assertRaises.

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

this worked for me

Task 2

Now add a new test, test_no_args that should also assertRaises(ValueError). This time, call get_anagrams() with no arguments.

import unittest

from string_fun import get_anagrams

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

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