Don't test get_write_buffer_size because it is difficult to predict and it depends on SO_SNDBUF value

Author: taras

tests/test_tcp.py

@@ -1224,21 +1224,16 @@ def resume_writing(self):
  t, p = await self.loop.create_connection(Protocol, *addr)
 
  t.write(b'q' * 512)
- self.assertEqual(t.get_write_buffer_size(), 512)
-
  t.set_write_buffer_limits(low=16385)
- self.assertFalse(paused)
  self.assertEqual(t.get_write_buffer_limits(), (16385, 65540))
 
  with self.assertRaisesRegex(ValueError, 'high.*must be >= low'):
  t.set_write_buffer_limits(high=0, low=1)
 
  t.set_write_buffer_limits(high=1024, low=128)
- self.assertFalse(paused)
  self.assertEqual(t.get_write_buffer_limits(), (128, 1024))
 
  t.set_write_buffer_limits(high=256, low=128)
- self.assertTrue(paused)
  self.assertEqual(t.get_write_buffer_limits(), (128, 256))
 
  t.close()

uvloop/handles/stream.pyx

@@ -375,7 +375,6 @@ cdef class UVStream(UVBaseTransport):
  # uv_try_write -- less layers of code. The error
  # checking logic is copied from libuv.
  written = system.write(fd, buf, blen)
-
  while written == -1 and (
  errno.errno == errno.EINTR or
  (system.PLATFORM_IS_APPLE and