code: def test_physical_quantities(self):
      a = PhysicalQuantity(1.0)
      b = PhysicalQuantity(5.0)
      assert_equal(logspace(a, b), logspace(1.0, 5.0))
  
imports: import sys
  import pytest
  import numpy
  from numpy import logspace, linspace, geomspace, dtype, array, arange, isnan, ndarray, sqrt, nextafter, stack, errstate
  from numpy._core import sctypes
  from numpy._core.function_base import add_newdoc
  from numpy.testing import assert_, assert_equal, assert_raises, assert_array_equal, assert_allclose, IS_PYPY
label_desc: Use image node_id 6 for calling the TestLogspace obj's underlying member method code with example usage: obj.test_physical_quantities() without return types