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"""test the inspection registry system."""
from sqlalchemy import inspect
from sqlalchemy import Table, Column, Integer, MetaData
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import is_
class TestCoreInspection(fixtures.TestBase):
def test_table(self):
t = Table("t", MetaData(), Column("x", Integer))
is_(inspect(t), t)
assert t.is_selectable
is_(t.selectable, t)
def test_select(self):
t = Table("t", MetaData(), Column("x", Integer))
s = t.select()
is_(inspect(s), s)
assert s.is_selectable
is_(s.selectable, s)
def test_column_expr(self):
c = Column("x", Integer)
is_(inspect(c), c)
assert not c.is_selectable
assert not hasattr(c, "selectable")
def test_no_clause_element_on_clauseelement(self):
# re [ticket:3802], there are in the wild examples
# of looping over __clause_element__, therefore the
# absence of __clause_element__ as a test for "this is the clause
# element" must be maintained
x = Column("foo", Integer)
assert not hasattr(x, "__clause_element__")
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