content: from datashader import datashape
  import pytest
  
  
  def test_equal():
      assert datashape.integral == datashape.integral
      assert datashape.floating != datashape.integral
  
  
  def test_repr():
      assert repr(datashape.integral) == '{integral}'
  
  
  def test_custom_typeset_repr():
      mytypeset = datashape.TypeSet(datashape.int64, datashape.float64)
      assert repr(mytypeset).startswith('TypeSet(')
      assert repr(mytypeset).endswith('name=None)')
  
  
  def test_register_already_existing_typeset_fails():
      mytypeset = datashape.TypeSet(datashape.int64, datashape.float64,
                                    name='foo')
      with pytest.raises(TypeError):
          datashape.typesets.register_typeset('foo', mytypeset)
  
  
  def test_getitem():
      assert datashape.typesets.registry['integral'] == datashape.integral
  
  
  def test_getitem_non_existent_typeset():
      with pytest.raises(KeyError):
          datashape.typesets.registry['footypeset']
  