
import unittest
import user_code
import ast
import re   
import unittest
import importlib
import user_code

class TestTask(unittest.TestCase):
    def test_valid_division(self):
        importlib.reload(user_code)
        result = user_code.divide_numbers(10, 2)
        _dynamic_test(
            self,
            result == 5.0,
            "Correct result returned for valid division (10/2)",
            f"Expected 5.0, got {result}",
        )

    def test_zero_division(self):
        importlib.reload(user_code)
        result = user_code.divide_numbers(10, 0)
        _dynamic_test(
            self,
            isinstance(result, str) and result == "An error occurred. Please check your input.",
            "Correct error message for division by zero",
            f"Expected error message for division by zero, got {result}",
        )

    def test_type_error(self):
        importlib.reload(user_code)
        result = user_code.divide_numbers(10, "x")
        _dynamic_test(
            self,
            isinstance(result, str) and result == "An error occurred. Please check your input.",
            "Correct error message for type error",
            f"Expected error message for type error, got {result}",
        )

    def test_no_internal_details(self):
        importlib.reload(user_code)
        result = user_code.divide_numbers(10, 0)
        _dynamic_test(
            self,
            "ZeroDivisionError" not in result and "Traceback" not in result and "division by zero" not in result,
            "No internal details are leaked in error message (ZeroDivisionError)",
            f"Internal details leaked in error message: {result}",
        )
        result2 = user_code.divide_numbers(10, "x")
        _dynamic_test(
            self,
            "TypeError" not in result2 and "Traceback" not in result2 and "unsupported operand" not in result2,
            "No internal details are leaked in error message (TypeError)",
            f"Internal details leaked in error message: {result2}",
        )

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

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Explore the most common security pitfalls in Python, how vulnerabilities arise, and the foundational principles for writing secure code.

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Challenge: Secure Exception Handling

Solution

Challenge: Secure Exception Handling

Solution