import sys
from io import StringIO
from nordhealth_test.solution import print_pairs_with_same_sum

def capture_output(func, *args, **kwargs):
    captured_output = StringIO()
    sys.stdout = captured_output
    func(*args, **kwargs)
    sys.stdout = sys.__stdout__
    return captured_output.getvalue()

# Test case Input 1: [6, 4, 12, 10, 22, 54, 32, 42, 21, 11]
def test_input_1():
    arr = [6, 4, 12, 10, 22, 54, 32, 42, 21, 11]
    expected_output = (
        "Pairs : ( 4, 12) ( 6, 10) have sum : 16\n"
        "Pairs : ( 10, 22) ( 21, 11) have sum : 32\n"
        "Pairs : ( 12, 21) ( 22, 11) have sum : 33\n"
        "Pairs : ( 22, 21) ( 32, 11) have sum : 43\n"
        "Pairs : ( 32, 21) ( 42, 11) have sum : 53\n"
        "Pairs : ( 12, 42) ( 22, 32) have sum : 54\n"
        "Pairs : ( 10, 54) ( 22, 42) have sum : 64\n"
    )
    result = capture_output(print_pairs_with_same_sum, arr)
    assert result == expected_output

# Test case Input 2: [4, 23, 65, 67, 24, 12, 86]
def test_input_2():
    arr = [4, 23, 65, 67, 24, 12, 86]
    expected_output = (
        "Pairs : ( 4, 86) ( 23, 67) have sum : 90\n"
    )
    result = capture_output(print_pairs_with_same_sum, arr)
    assert result == expected_output

# Test case: Array with no valid pairs
def test_no_valid_pairs():
    arr = [1, 2, 3, 5]
    expected_output = ""
    result = capture_output(print_pairs_with_same_sum, arr)
    assert result == expected_output

# Test case: Array with exactly one element
def test_single_element():
    arr = [10]
    expected_output = "No pairs can be formed from the input file.\n"
    result = capture_output(print_pairs_with_same_sum, arr)
    assert result == expected_output

# Test case: Empty array
def test_empty_array():
    arr = []
    expected_output = "No pairs can be formed from the input file.\n"
    result = capture_output(print_pairs_with_same_sum, arr)
    assert result == expected_output