text: import pytest
  
  from fluffy.utils import content_is_binary
  from fluffy.utils import gen_unique_id
  from fluffy.utils import human_size
  from fluffy.utils import pluralize
  
  
  @pytest.mark.parametrize(('num', 'expected'), [
      (-4, 'things'),
      (-1, 'thing'),
      (0, 'things'),
      (1, 'thing'),
      (4, 'things'),
  ])
  def test_pluralize(num, expected):
      assert pluralize('thing', num)
  
  
  @pytest.mark.parametrize(('num_bytes', 'expected'), [
      (0, '0 bytes'),
      (1, '1 byte'),
      (42, '42 bytes'),
      (1500, '1.5 KiB'),
      (1500, '1.5 KiB'),
      (43123150, '41.1 MiB'),
      (8123000222, '7.6 GiB'),
  ])
  def test_human_size(num_bytes, expected):
      assert human_size(num_bytes) == expected
  
  
  def test_gen_unique_uid():
      id1 = gen_unique_id()
      assert len(id1) == 32
  
      id2 = gen_unique_id()
      assert len(id2) == 32
  
      assert id1 != id2
  
  
  @pytest.mark.parametrize(('data', 'expected'), [
      (b'hello world', False),
      (b'hello\nworld\nherp\nderp', False),
      (b'', False),
      ('éóñəå  ⊂(◉‿◉)つ(ノ≥∇≤)ノ'.encode('utf8'), False),
      ('¯\_(ツ)_/¯'.encode('utf8'), False),
      ('♪┏(・o･)┛♪┗ ( ･o･) ┓♪┏ ( ) ┛♪┗ (･o･ ) ┓♪┏(･o･)┛♪'.encode('utf8'), False),
      ('éóñå'.encode('latin1'), False),
  
      (b'hello world\x00', True),
      (b'\x7f\x45\x4c\x46\x02\x01\x01', True),  # first few bytes of /bin/bash
      (b'\x43\x92\xd9\x0f\xaf\x32\x2c', True),  # some /dev/urandom output
  ])
  def test_content_is_binary(data, expected):
      assert content_is_binary(data) == expected
  