#!/usr/bin/env python3
"""Filter even numbers and return their squares."""

def even_squares(numbers):
    """Given a list of integers, return squares of even numbers."""
    return [n * n for n in numbers if n % 2 == 0]

if __name__ == "__main__":
    test_input = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    result = even_squares(test_input)
    expected = [4, 16, 36, 64, 100]
    print(f"Input: {test_input}")
    print(f"Result: {result}")
    print(f"Expected: {expected}")
    assert result == expected, f"Mismatch: {result} != {expected}"
    print("PASS")