code: def test_conversion(self):
      half = internal.to_float16(self.value)
      assert internal.from_float16(half) == self.value
  
imports: import math
  import unittest
  import numpy
  import pytest
  from cupy._core import internal
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestConvertFloat16 obj's underlying member method code with example usage: obj.test_conversion() without return types