
import unittest
import user_code
import ast
import re   
import importlib
import csv
import unittest
import importlib
import pandas as pd
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

class TestTask(unittest.TestCase):
    def setUp(self):
        # Prepare test DataFrame
        self.data = {
            'date': pd.date_range(start='2024-01-01', periods=10, freq='D'),
            'sales': [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
        }
        self.df = pd.DataFrame(self.data)
        # Patch plt.show to avoid blocking
        self._original_show = plt.show
        plt.show = lambda *args, **kwargs: None

    def tearDown(self):
        plt.show = self._original_show

    def test_moving_average_column(self):
        import user_code
        importlib.reload(user_code)
        df = self.df.copy()
        user_code.plot_sales_with_moving_average(df)
        has_col = 'MovingAverage' in df.columns
        correct_values = df['MovingAverage'].iloc[6] == sum(self.data['sales'][:7])/7
        _dynamic_test(
            self,
            has_col and correct_values,
            "Function correctly calculates 7-day moving average and adds 'MovingAverage' column.",
            f"Missing or incorrect 'MovingAverage' column in DataFrame."
        )

    def test_plot_lines_count(self):
        import user_code
        importlib.reload(user_code)
        df = self.df.copy()
        plt.clf()
        user_code.plot_sales_with_moving_average(df)
        lines = plt.gca().get_lines()
        _dynamic_test(
            self,
            len(lines) >= 2,
            "Both sales and moving average lines are plotted.",
            f"Expected at least 2 lines on the plot, found {len(lines)}."
        )

    def test_axis_labels_and_title(self):
        import user_code
        importlib.reload(user_code)
        df = self.df.copy()
        plt.clf()
        user_code.plot_sales_with_moving_average(df)
        ax = plt.gca()
        xlabel = ax.get_xlabel()
        ylabel = ax.get_ylabel()
        title = ax.get_title()
        _dynamic_test(
            self,
            xlabel.lower() == 'date' and ylabel.lower() == 'sales' and 'moving average' in title.lower(),
            "Axis labels and title are correct.",
            f"Expected xlabel 'Date', ylabel 'Sales', and title containing 'Moving Average'. Got xlabel '{xlabel}', ylabel '{ylabel}', title '{title}'."
        )

    def test_legend_present(self):
        import user_code
        importlib.reload(user_code)
        df = self.df.copy()
        plt.clf()
        user_code.plot_sales_with_moving_average(df)
        ax = plt.gca()
        legend = ax.get_legend()
        labels = legend.get_texts() if legend else []
        label_texts = [t.get_text().lower() for t in labels]
        _dynamic_test(
            self,
            'daily sales' in label_texts and '7-day moving average' in label_texts,
            "Legend includes both 'Daily Sales' and '7-Day Moving Average'.",
            f"Legend missing required labels. Found: {label_texts}"
        )

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: Plot Sales Moving Average

Solution