old_contents: import lz4.frame as lz4frame
  
  def test_create_compression_context():
      context = lz4frame.create_compression_context()
      assert context != None
  
  def test_create_decompression_context():
      context = lz4frame.create_decompression_context()
      assert context != None
  
new_contents: import lz4.frame as lz4frame
  
  def test_create_compression_context():
      context = lz4frame.create_compression_context()
      assert context != None
  
  def test_create_decompression_context():
      context = lz4frame.create_decompression_context()
      assert context != None
  
  def test_compress_return_type_1():
      r = lz4frame.compress(b'', return_bytearray=False)
      assert isinstance(r, bytes)
  
  def test_compress_return_type_2():
      r = lz4frame.compress(b'', return_bytearray=True)
      assert isinstance(r, bytearray)
  
  def test_decompress_return_type_1():
      c = lz4frame.compress(b'', return_bytearray=False)
      r = lz4frame.decompress(
          c,
          return_bytearray=False,
          return_bytes_read=False
      )
      assert isinstance(r, bytes)
  
  def test_decompress_return_type_2():
      c = lz4frame.compress(b'', return_bytearray=False)
      r = lz4frame.decompress(
          c,
          return_bytearray=True,
          return_bytes_read=False
      )
      assert isinstance(r, bytearray)
  
  def test_decompress_return_type_3():
      c = lz4frame.compress(b'', return_bytearray=False)
      r = lz4frame.decompress(
          c,
          return_bytearray=False,
          return_bytes_read=True
      )
      assert isinstance(r, tuple)
      assert isinstance(r[0], bytes)
      assert isinstance(r[1], int)
  
  def test_decompress_return_type_4():
      c = lz4frame.compress(b'', return_bytearray=False)
      r = lz4frame.decompress(
          c,
          return_bytearray=True,
          return_bytes_read=True
      )
      assert isinstance(r, tuple)
      assert isinstance(r[0], bytearray)
      assert isinstance(r[1], int)
  
  def test_decompress_chunk_return_type_1():
      c = lz4frame.compress(b'', return_bytearray=False)
      d = lz4frame.create_decompression_context()
      r = lz4frame.decompress_chunk(
          d,
          c,
          return_bytearray=False,
          return_bytes_read=False
      )
      assert isinstance(r, bytes)
  
  def test_decompress_chunk_return_type_2():
      c = lz4frame.compress(b'', return_bytearray=False)
      d = lz4frame.create_decompression_context()
      r = lz4frame.decompress_chunk(
          d,
          c,
          return_bytearray=True,
          return_bytes_read=False
      )
      assert isinstance(r, bytearray)
  
  def test_decompress_chunk_return_type_3():
      c = lz4frame.compress(b'', return_bytearray=False)
      d = lz4frame.create_decompression_context()
      r = lz4frame.decompress_chunk(
          d,
          c,
          return_bytearray=False,
          return_bytes_read=True
      )
      assert isinstance(r, tuple)
      assert isinstance(r[0], bytes)
      assert isinstance(r[1], int)
  
  def test_decompress_chunk_return_type_4():
      c = lz4frame.compress(b'', return_bytearray=False)
      d = lz4frame.create_decompression_context()
      r = lz4frame.decompress_chunk(
          d,
          c,
          return_bytearray=True,
          return_bytes_read=True
      )
      assert isinstance(r, tuple)
      assert isinstance(r[0], bytearray)
      assert isinstance(r[1], int)
  
subject: Add some more tests