def test_remove_columns(self):
X = np.random.rand(6, 5)
X[:, (1, 3)] = 5
X[3, 1] = np.nan
X[1, 1] = np.nan
X[:, 4] = np.nan
data = Table(X)
d = RemoveConstant()(data)
self.assertEqual(len(d.domain.attributes), 2)
pp_rc = RemoveConstant()
d = pp_rc(data)
self.assertEqual(len(d.domain.attributes), 2)
def test_nothing_to_remove(self):
data = Table("iris")
d = RemoveConstant()(data)
self.assertEqual(len(d.domain.attributes), 4)
