You are about to face a **magical challenge**: as an apprentice wizard, you need to ensure your Magic Wand’s spell-casting script behaves correctly, even when the unpredictable forces of mana are at play. The wand relies on a function called `get_mana_level()` to sense the ambient magical energy. If the mana is high enough, your fiery spell bursts forth; if not, it fizzles into a disappointing puff. To test your spell reliably, you must **mock the mana level**, simulating both high and low magical energy.


import unittest
import user_code
import ast
import re   
import importlib
import csv
import unittest
from unittest.mock import patch
import importlib

class TestTask(unittest.TestCase):
    def test_spell_success(self):
        import user_code
        importlib.reload(user_code)
        with patch('user_code.get_mana_level', return_value=80):
            result = user_code.cast_spell()
            _dynamic_test(
                self,
                result == "Fireball cast successfully!",
                "cast_spell() returns success message when mana is high (mocked to 80)",
                f"Expected success message, got: {result}"
            )

    def test_spell_fizzle(self):
        import user_code
        importlib.reload(user_code)
        with patch('user_code.get_mana_level', return_value=20):
            result = user_code.cast_spell()
            _dynamic_test(
                self,
                result == "The spell fizzled...",
                "cast_spell() returns fizzle message when mana is low (mocked to 20)",
                f"Expected fizzle message, got: {result}"
            )

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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Master Python's exception system for robust error handling and debugging.

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Challenge: Mocking Internal Dependencies

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