old_contents: import pytest
  import pyecore.ecore as Ecore
  
  def test_ecore_URI():
      assert Ecore.nsURI == 'http://www.eclipse.org/emf/2002/Ecore'
  
  
  def test_get_existing_EClassifier():
      assert Ecore.getEClassifier('EClass')
  
  
  def test_get_nonexisting_EClassifier():
      assert not Ecore.getEClassifier('EEClass')
  
new_contents: import pytest
  from pyecore.ecore import *
  
  def test_ecore_URI():
      assert nsURI == 'http://www.eclipse.org/emf/2002/Ecore'
  
  
  def test_get_existing_EClassifier():
      assert getEClassifier('EClass')
  
  
  def test_get_nonexisting_EClassifier():
      assert not getEClassifier('EEClass')
  
  
  def test_ecore_isinstance_none():
      assert EcoreUtils.isinstance(None, EClass)
  
subject: Upgrade existing basic tests