def test_truncate_at_multiple_chars():
"""Ensure truncation with multiple characters uses the rightmost one."""
original = 'as-df=zx_cv'
assert truncate_string_at_char(original, '-=') == 'as-df'
def test_truncate_at_last_char():
"""Ensure truncation happens at the last occurrence of the character."""
original = 'as df zx cv'
assert truncate_string_at_char(original, ' ') == 'as df zx'
def test_truncate_at_nonexistent_char():
"""Ensure truncation-at-character doesn't apply if char isn't present."""
original = 'asdfzxcv'
assert truncate_string_at_char(original, ' ') == original
def test_truncate_at_char():
"""Ensure truncation at a particular character works."""
original = 'asdf zxcv'
assert truncate_string_at_char(original, ' ') == 'asdf'