
import unittest
import user_code
import ast
import re   
import unittest
import importlib
import io
from contextlib import redirect_stdout

class TestTask(unittest.TestCase):
    def test_returns_hash_string(self):
        import user_code
        importlib.reload(user_code)
        pw = "mySecretPassword123!"
        result = user_code.hash_password(pw)
        _dynamic_test(
            self,
            isinstance(result, str) and len(result) == 64,
            "Function returns a 64-character string hash",
            f"Expected a 64-character hash string, got: {result}",
        )

    def test_hash_is_not_password(self):
        import user_code
        importlib.reload(user_code)
        pw = "another$trongP@ss"
        result = user_code.hash_password(pw)
        _dynamic_test(
            self,
            result != pw,
            "Returned value is not the original password",
            f"Returned value should not be the input password, got: {result}",
        )

    def test_different_passwords_different_hashes(self):
        import user_code
        importlib.reload(user_code)
        pw1 = "passwordOne!"
        pw2 = "passwordTwo!"
        hash1 = user_code.hash_password(pw1)
        hash2 = user_code.hash_password(pw2)
        _dynamic_test(
            self,
            hash1 != hash2,
            "Different passwords produce different hashes",
            f"Expected different hashes for different passwords, got: {hash1} and {hash2}",
        )

    def test_same_password_same_hash(self):
        import user_code
        importlib.reload(user_code)
        pw = "constantPassword!"
        hash1 = user_code.hash_password(pw)
        hash2 = user_code.hash_password(pw)
        _dynamic_test(
            self,
            hash1 == hash2,
            "Same password always produces the same hash",
            f"Expected same hash for same password, got: {hash1} and {hash2}",
        )

    def test_password_not_stored_or_returned(self):
        # Check that the password is not returned and not present in the function output
        import user_code
        importlib.reload(user_code)
        pw = "NoStorePassword!"
        hash_val = user_code.hash_password(pw)
        _dynamic_test(
            self,
            pw not in hash_val,
            "Password is not present in the returned hash",
            f"Password should not appear in returned value, got: {hash_val}",
        )

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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Learn how to handle, store, and process sensitive data securely in Python applications.

Challenge: Secure Password Storage

Solution

Challenge: Secure Password Storage

Solution