code: def test_basic(self):
      y = linspace(0, 10)
      assert_(len(y) == 50)
      y = linspace(2, 10, num=100)
      assert_(y[-1] == 10)
      y = linspace(2, 10, endpoint=False)
      assert_(y[-1] < 10)
      assert_raises(ValueError, linspace, 0, 10, num=-1)
  
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 1 for calling the TestLinspace obj's underlying member method code with example usage: obj.test_basic() without return types