
import unittest
import user_code
import ast
import re   
import importlib
import csv
import unittest
import importlib
import io
import sys
import asyncio
from contextlib import redirect_stdout
import time

class TestTask(unittest.TestCase):
    def setUp(self):
        # Reload user_code fresh for each test
        self.user_code = importlib.import_module('user_code')
        importlib.reload(self.user_code)

    def test_simulate_web_request_output(self):
        # Patch asyncio.sleep to speed up test
        original_sleep = asyncio.sleep
        async def fast_sleep(delay):
            return await original_sleep(0)
        self.user_code.asyncio.sleep = fast_sleep

        f = io.StringIO()
        with redirect_stdout(f):
            asyncio.run(self.user_code.main())
        output = normalize_text(f.getvalue())
        # Check for all required output lines
        for req, delay in [('Request-A', '2'), ('Request-B', '1'), ('Request-C', '3')]:
            expected = normalize_text(f"{req} completed after {delay} seconds")
            _dynamic_test(
                self,
                expected in output,
                f"Output contains: {expected}",
                f"Missing output: {expected}"
            )

    def test_requests_run_concurrently(self):
        # This test checks that the total runtime is less than the sum of all delays
        # i.e., requests are concurrent, not sequential
        start = time.time()
        asyncio.run(self.user_code.main())
        elapsed = time.time() - start
        # Sequential would be 2+1+3=6, concurrent should be just over 3
        _dynamic_test(
            self,
            elapsed < 5,
            "Requests run concurrently (total time < 5 seconds)",
            f"Requests did not run concurrently (elapsed: {elapsed:.2f} seconds)"
        )

    def test_function_signatures(self):
        # Check that function signatures are not changed
        import inspect
        sig = inspect.signature(self.user_code.simulate_web_request)
        params = list(sig.parameters.keys())
        _dynamic_test(
            self,
            params == ['name', 'delay'],
            "Function signature for simulate_web_request is unchanged.",
            f"simulate_web_request signature changed: {params}"
        )
        sig_main = inspect.signature(self.user_code.main)
        _dynamic_test(
            self,
            list(sig_main.parameters.keys()) == [],
            "main() signature is unchanged.",
            f"main signature should have no parameters, got: {list(sig_main.parameters.keys())}"
        )

def _dynamic_test(test_case, condition, success_message, failure_message):
    if condition:
        test_case._testMethodName = success_message
        test_case.assertTrue(True, success_message)
    else:
        test_case._testMethodName = failure_message
        test_case.fail(failure_message)

def normalize_text(text):
    text = text.lower()
    text = re.sub(r"\\s{2,}", " ", text)
    text = re.sub(r"\\s*([,:?])\\s*", r"\\1 ", text)
    return text.strip()

def change_var(code: str, var_name: str, value: str) -> str:
    tree = ast.parse(code)
    lines = code.splitlines()
    changed = False
    # Collect all assignment nodes to modify
    assign_nodes = [
        (i, node)
        for i, node in enumerate(tree.body)
        if isinstance(node, ast.Assign)
        and any(isinstance(target, ast.Name) and target.id == var_name for target in node.targets)
    ]

    # If nothing to change, return unmodified code
    if not assign_nodes:
        return code

    # Perform replacements for all matching assignments (from last to first to not break line offsets)
    for i, node in reversed(assign_nodes):
        start_line = node.lineno - 1
        line = lines[start_line]
        indent = ' ' * (len(line) - len(line.lstrip()))
        lines[start_line] = f"{indent}{var_name} = {value}"
        next_line = len(lines)
        for next_node in tree.body[i+1:]:
            if hasattr(next_node, 'lineno'):
                next_line = next_node.lineno - 1
                break
        if next_line > start_line + 1:
            lines[start_line+1:next_line] = []
        changed = True

    return '\\n'.join(lines) if changed else code

if __name__ == "__main__":
    unittest.main()


test_main.py

Un análisis profundo de conceptos avanzados de programación estructural en Python, enfocado en el manejo robusto de archivos, gestión de errores, concurrencia, programación asíncrona y pruebas.

Domina el sistema de excepciones de Python para un manejo de errores y depuración robustos.

Explora técnicas avanzadas para operaciones de archivos y gestión de recursos utilizando gestores de contexto.

Comparación y aplicación de los módulos de multithreading y multiprocessing de Python para la programación concurrente.

Domina la programación asíncrona en Python utilizando la biblioteca asyncio para aplicaciones escalables dependientes de E/S.

Explora cómo escribir, organizar y ejecutar pruebas utilizando los frameworks unittest y pytest de Python.

Desafío: Simulador de Solicitudes Web Asíncronas

Solución