
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_prints_all_items_aligned(self):
        import user_code
        importlib.reload(user_code)
        expenses = [
            ("Groceries", 54.32),
            ("Utilities", 120.00),
            ("Coffee", 8.50),
            ("Internet", 45.99)
        ]
        f = io.StringIO()
        with redirect_stdout(f):
            user_code.print_expense_report(expenses)
        output = f.getvalue()
        expected_rows = [
            "Item         | Amount",
            "-------------|-------",
            "Groceries    | $ 54.32",
            "Utilities    | $120.00",
            "Coffee       | $  8.50",
            "Internet     | $ 45.99",
            "-------------|-------",
            "Total        | $228.81"
        ]
        for row in expected_rows:
            _dynamic_test(
                self,
                normalize_text(row) in normalize_text(output),
                f"Output contains row: {row}",
                f"Expected row '{row}' not found in output: {output}",
            )

    def test_amounts_two_decimal_places(self):
        import user_code
        importlib.reload(user_code)
        expenses = [
            ("Lunch", 10),
            ("Snacks", 3.1)
        ]
        f = io.StringIO()
        with redirect_stdout(f):
            user_code.print_expense_report(expenses)
        output = f.getvalue()
        _dynamic_test(
            self,
            "$ 10.00" in output and "$  3.10" in output and "$ 13.10" in output,
            "All amounts and total are formatted with two decimal places.",
            f"Amounts or total not formatted to two decimal places: {output}",
        )

    def test_total_label_and_sum(self):
        import user_code
        importlib.reload(user_code)
        expenses = [
            ("Book", 15.75),
            ("Pen", 1.25)
        ]
        f = io.StringIO()
        with redirect_stdout(f):
            user_code.print_expense_report(expenses)
        output = f.getvalue()
        _dynamic_test(
            self,
            "Total        | $ 17.00" in output or "Total        | $17.00" in output,
            "Total row is printed with correct label and sum.",
            f"Total row with correct sum not found: {output}",
        )

    def test_empty_expenses(self):
        import user_code
        importlib.reload(user_code)
        expenses = []
        f = io.StringIO()
        with redirect_stdout(f):
            user_code.print_expense_report(expenses)
        output = f.getvalue()
        _dynamic_test(
            self,
            "Total        | $  0.00" in output or "Total        | $0.00" in output,
            "Handles empty expenses list and prints total as 0.00.",
            f"Total for empty expenses should be 0.00, got: {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

def print_expense_report(expenses):
    print("Item         | Amount")
    print("-------------|-------")
    total = 0
    for item, amount in expenses:
        line = f"{item:<12} | ${amount:>6.2f}"
        print(line)
        total += amount
    total_line = f"{'Total':<12} | ${total:>6.2f}"
    print("-------------|-------")
    print(total_line)

expenses = [
    ("Groceries", 54.32),
    ("Utilities", 120.00),
    ("Coffee", 8.50),
    ("Internet", 45.99)
]
print_expense_report(expenses)

def print_expense_report(expenses):
    print("Item         | Amount")
    print("-------------|-------")
    # Write your code here

expenses = [
    ("Groceries", 54.32),
    ("Utilities", 120.00),
    ("Coffee", 8.50),
    ("Internet", 45.99)
]
print_expense_report(expenses)

Write a function that prints a neatly formatted table of items and expenses, including the total expense at the end.

- Print each item and its amount, formatted in aligned columns;
- After listing all items, print a row with the total amount, labeled "Total";
- The amount for each item and the total should be displayed with two decimal places.

### Unit Test Checklist

- Each item and its amount are printed in aligned columns;
- The total amount is printed after all items, labeled "Total";
- Amounts, including the total, are formatted with two decimal places;
- The function handles an empty list of expenses by showing only headers and the total as 0.00.

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Challenge: Generate a Simple Expense Report

Løsning

Unit Test Checklist