old_contents: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  from jnius import autoclass
  
  class StringArgumentForByteArrayTest(unittest.TestCase):
  
      def test_string_arg_for_byte_array(self):
          # the ByteBuffer.wrap() accept only byte[].
          ByteBuffer = autoclass('java.nio.ByteBuffer')
          self.assertIsNotNone(ByteBuffer.wrap(b'hello world'))
  
      def test_string_arg_with_signed_char(self):
          ByteBuffer = autoclass('java.nio.ByteBuffer')
          self.assertIsNotNone(ByteBuffer.wrap(b'\x00\xffHello World\x7f'))
  
      def test_fill_byte_array(self):
          arr = [0, 0, 0]
          Test = autoclass('org.jnius.BasicsTest')()
          Test.fillByteArray(arr)
          self.assertEquals(
              arr,
              [127, 1, -127])
  
      def test_create_bytearray(self):
          StringBufferInputStream = autoclass('java.io.StringBufferInputStream')
          nis = StringBufferInputStream("Hello world")
          barr = bytearray("\x00" * 5)
          self.assertEquals(nis.read(barr, 0, 5), 5)
          self.assertEquals(barr, "Hello")
  
  
new_contents: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  from jnius import autoclass
  
  class StringArgumentForByteArrayTest(unittest.TestCase):
  
      def test_string_arg_for_byte_array(self):
          # the ByteBuffer.wrap() accept only byte[].
          ByteBuffer = autoclass('java.nio.ByteBuffer')
          self.assertIsNotNone(ByteBuffer.wrap(b'hello world'))
  
      def test_string_arg_with_signed_char(self):
          ByteBuffer = autoclass('java.nio.ByteBuffer')
          self.assertIsNotNone(ByteBuffer.wrap(b'\x00\xffHello World\x7f'))
  
      def test_fill_byte_array(self):
          arr = [0, 0, 0]
          Test = autoclass('org.jnius.BasicsTest')()
          Test.fillByteArray(arr)
          # we don't received signed byte, but unsigned in python.
          self.assertEquals(
              arr,
              [127, 1, 129])
  
      def test_create_bytearray(self):
          StringBufferInputStream = autoclass('java.io.StringBufferInputStream')
          nis = StringBufferInputStream("Hello world")
          barr = bytearray("\x00" * 5, encoding="utf8")
          self.assertEquals(nis.read(barr, 0, 5), 5)
          self.assertEquals(barr, "Hello")
  
      def test_bytearray_ascii(self):
          ByteArrayInputStream = autoclass('java.io.ByteArrayInputStream')
          s = "".join(chr(x) for x in range(256))
          nis = ByteArrayInputStream(s)
          barr = bytearray("\x00" * 256, encoding="ascii")
          self.assertEquals(nis.read(barr, 0, 256), 256)
          self.assertEquals(barr, s)
  
  
subject: fix bytearray test, and check more input/output signed/unsigned with unittests