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Python Python Testing Be Assertive assertIn

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14,136 Points
Posted by Y B
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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))
Y B
Y B
14,136 Points
Y B
Y B
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 68,457 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points

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

Y B
Y B
14,136 Points
Y B
Y B
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?

Jason Anello
Jason Anello
Courses Plus Student 94,610 Points

You have 'Treehouse' capitalized.

Prashant chaudhari
PLUS
Prashant chaudhari
Courses Plus Student 24,499 Points
Prashant chaudhari
Prashant chaudhari
Courses Plus Student 24,499 Points

import unittest

from string_fun import get_anagrams

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

Y B
Y B
14,136 Points
Y B
Y B
14,136 Points

Doh!

Thanks - Looked at it for far too long

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

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("")

maxwell ruzvidzo
maxwell ruzvidzo
6,822 Points
maxwell ruzvidzo
maxwell ruzvidzo
6,822 Points

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

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

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()