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Python Python Testing Be Assertive assertRaises

Mateo Rial
Mateo Rial
3,694 Points

I don´t understand what I am supposed to do

'''python import unittest

from string_fun import get_anagrams

class AnagramTestCase(unittest.TestCase): def test_empty_string(self): pass

tests.py
import unittest

from string_fun import get_anagrams


class AnagramTestCase(unittest.TestCase):
    def test_empty_string(self):
        pass
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)
        elif len(yarn[0] == 0):
            raise ValueError("Must provide at least two letters")
    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))

1 Answer

Ricky Catron
Ricky Catron
13,023 Points

Okay so the get_anagrams function throws an errors when the string passed to it is empty. The test you need to write is to "assert" that when the function is called with an empty string that it throws the expected error.

Mateo Rial
Mateo Rial
3,694 Points

Thanks Ricky!!

python''' 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()
Ricky Catron
Ricky Catron
13,023 Points

Seems right. Glad I could help!