import pytest
import os
import sys
import signal
import time
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
from functions.string_utils import *
import warnings

def test_uppercase_normal():
    # Normal string uppercase conversion
    assert uppercase("hello") == "HELLO"

def test_uppercase_type_error():
    # TypeError when input is None (invalid input)
    uppercase(None)

def test_reverse_string():
    # Tests string reversal correctness
    assert reverse("abc") == "cba"

def test_warning_emit():
    # Emits a Python UserWarning
    warnings.warn("Test warning", UserWarning)

def test_unicode_decode_error():
    # UnicodeDecodeError when decoding invalid byte sequence
    b'\xff'.decode('utf-8')

def test_unicode_decode_surrogateescape():
    # UnicodeDecodeError with strict error handler on invalid byte
    b"\x80".decode("utf-8", errors="strict")

def test_syntax_warning():
    # Emit a SyntaxWarning (Python will usually warn about questionable syntax)
    warnings.warn("This is a syntax warning", SyntaxWarning)

@pytest.mark.xfail(reason="Expected failure: uppercase does not handle digits")
def test_xfail_uppercase_digits():
    # Expected fail test because uppercase won't change digits
    assert uppercase("abc123") == "ABC1234"

'''
def test_sigkill():
    # Kill directly the program
    os.kill(os.getpid(), signal.SIGKILL)
    time.sleep(1)
'''

def test_keyboard_interrupt_direct():
    # Directly raise KeyboardInterrupt exception
    raise KeyboardInterrupt()