
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_add_task_inserts(self):
        import user_code
        importlib.reload(user_code)
        tasks = []
        user_code.add_task(tasks, "Do laundry")
        _dynamic_test(
            self,
            tasks == ["Do laundry"],
            "add_task adds a task to the list",
            f"Expected ['Do laundry'], got {tasks}",
        )

    def test_remove_existing_task(self):
        import user_code
        importlib.reload(user_code)
        tasks = ["A", "B", "C"]
        user_code.remove_task(tasks, "B")
        _dynamic_test(
            self,
            tasks == ["A", "C"],
            "remove_task removes an existing task",
            f"Expected ['A', 'C'], got {tasks}",
        )

    def test_remove_nonexistent_task(self):
        import user_code
        importlib.reload(user_code)
        tasks = ["A", "B"]
        try:
            user_code.remove_task(tasks, "X")
            no_error = True
        except Exception:
            no_error = False
        _dynamic_test(
            self,
            no_error and tasks == ["A", "B"],
            "remove_task does not error or change list if task not found",
            f"Expected ['A', 'B'] and no error, got {tasks}",
        )

    def test_print_tasks_prints_current_list(self):
        import user_code
        importlib.reload(user_code)
        tasks = ["Buy groceries", "Call the bank", "Walk the dog"]
        f = io.StringIO()
        with redirect_stdout(f):
            user_code.print_tasks(tasks)
        output = normalize_text(f.getvalue())
        expected = normalize_text(str(tasks))
        _dynamic_test(
            self,
            expected in output,
            f"print_tasks prints the current list: {expected}",
            f"Expected output: '{expected}' not found in: {output}",
        )

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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Challenge: To-Do List Organizer

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Challenge: To-Do List Organizer

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