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#!/usr/bin/env python3

import importlib.util

import json

import pathlib

from types import ModuleType

from typing import Dict, List

import pytest

PROJECT_EULER_DIR_PATH = pathlib.Path.cwd().joinpath("project_euler")

PROJECT_EULER_ANSWERS_PATH = PROJECT_EULER_DIR_PATH.joinpath(

"project_euler_answers.json"

)

with open(PROJECT_EULER_ANSWERS_PATH) as file_handle:

PROBLEM_ANSWERS: Dict[str, str] = json.load(file_handle)

def convert_path_to_module(file_path: pathlib.Path) -> ModuleType:

"""Converts a file path to a Python module"""

spec = importlib.util.spec_from_file_location(file_path.name, str(file_path))

module = importlib.util.module_from_spec(spec)

spec.loader.exec_module(module)

return module

def collect_solution_file_paths() -> List[pathlib.Path]:

"""Collects all the solution file path in the Project Euler directory"""

solution_file_paths = []

for problem_dir_path in PROJECT_EULER_DIR_PATH.iterdir():

if problem_dir_path.is_file() or problem_dir_path.name.startswith("_"):

continue

for file_path in problem_dir_path.iterdir():

if file_path.suffix != ".py" or file_path.name.startswith(("_", "test")):

continue

solution_file_paths.append(file_path)

return solution_file_paths

@pytest.mark.parametrize(

"solution_path",

collect_solution_file_paths(),

ids=lambda path: f"{path.parent.name}/{path.name}",

)

def test_project_euler(solution_path: pathlib.Path):

"""Testing for all Project Euler solutions"""

# problem_[extract this part] and pad it with zeroes for width 3

problem_number: str = solution_path.parent.name[8:].zfill(3)

expected: str = PROBLEM_ANSWERS[problem_number]

solution_module = convert_path_to_module(solution_path)

answer = str(solution_module.solution())

assert answer == expected, f"Expected {expected} but got {answer}"

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