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

# ──────────────────────────────────────────────────────────────────────────────
# helpers (как в твоём шаблоне)
# ──────────────────────────────────────────────────────────────────────────────

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()
    for i, node in enumerate(tree.body):
        if isinstance(node, ast.Assign):
            for target in node.targets:
                if isinstance(target, ast.Name) and target.id == var_name:
                    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] = []
                    return "\\n".join(lines)
    return code

# ──────────────────────────────────────────────────────────────────────────────
# tests
# ──────────────────────────────────────────────────────────────────────────────

class TestTask(unittest.TestCase):
    def setUp(self):
        """Каждый тест начинает с «чистого» импорта user_code и гасит его print'ы при импорте."""
        import sys
        if "user_code" in sys.modules:
            del sys.modules["user_code"]
        buf = io.StringIO()
        with redirect_stdout(buf):
            import user_code  # noqa: F401
        self.import_output = buf.getvalue()
        self.mod = importlib.import_module("user_code")

    def test_sensitive_action_defined(self):
        sensitive_action = getattr(self.mod, "sensitive_action", None)
        _dynamic_test(
            self,
            callable(sensitive_action),
            "sensitive_action is defined",
            "sensitive_action is not defined",
        )

    def test_permission_error_when_not_admin(self):
        # выставляем False и ожидаем PermissionError
        self.mod.IS_ADMIN = False
        sensitive_action = getattr(self.mod, "sensitive_action", None)
        _dynamic_test(
            self,
            callable(sensitive_action),
            "sensitive_action exists for non-admin check",
            "sensitive_action missing for non-admin check",
        )
        try:
            sensitive_action()
            _dynamic_test(
                self,
                False,
                "PermissionError raised when IS_ADMIN is False",
                "PermissionError was not raised when IS_ADMIN is False",
            )
        except PermissionError:
            _dynamic_test(
                self,
                True,
                "PermissionError raised when IS_ADMIN is False",
                "PermissionError was not raised when IS_ADMIN is False",
            )
        except Exception as e:
            _dynamic_test(
                self,
                False,
                "PermissionError raised when IS_ADMIN is False",
                f"Unexpected exception: {type(e)}: {e}",
            )

    def test_allows_execution_when_admin(self):
        # выставляем True и ожидаем корректный возврат
        self.mod.IS_ADMIN = True
        sensitive_action = getattr(self.mod, "sensitive_action", None)
        _dynamic_test(
            self,
            callable(sensitive_action),
            "sensitive_action exists for admin check",
            "sensitive_action missing for admin check",
        )
        try:
            result = sensitive_action()
            _dynamic_test(
                self,
                result == "Sensitive action performed",
                "Function returns correct value when IS_ADMIN is True",
                f"Expected 'Sensitive action performed', got '{result}'",
            )
        except Exception as e:
            _dynamic_test(
                self,
                False,
                "Function executes when IS_ADMIN is True",
                f"Unexpected exception: {type(e)}: {e}",
            )

    def test_import_side_effect_output(self):
        """
        В твоём user_code при импорте:
          - сначала IS_ADMIN = False и вызов sensitive_action() печатает PermissionError
          - затем IS_ADMIN = True и вызов печатает 'Sensitive action performed'
        Проверим, что оба сообщения присутствуют в выводе импорта.
        """
        text = normalize_text(self.import_output)
        has_perm = "permissionerror" in text or "permissionerror:" in text
        has_ok = "sensitive action performed" in text
        _dynamic_test(
            self,
            has_perm and has_ok,
            "Import prints both PermissionError and success line",
            f"Import output missing expected lines. Got: {self.import_output!r}",
        )

if __name__ == "__main__":
    unittest.main(verbosity=2)


test_main.py

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Challenge: Access Control Decorator

解答