def test_is_empty(self):
# And filter with no nested clauses is empty.
and_filter = And()
self.assertTrue(and_filter.is_empty())
# Not filter with no nested clauses is empty.
not_filter = Not()
self.assertTrue(not_filter.is_empty())
# An age filter is never empty.
age_filter = Age('woot')
self.assertFalse(age_filter.is_empty())
# We're adding the not filter to the and_filter. The not_filter is
# empty, therefore so is the and_filter.
and_filter.add_filter(not_filter)
self.assertTrue(and_filter.is_empty())
# Now we add an age_filter to the not filter, and the whole onion of
# nested filters starts evaluating as "not empty."
not_filter.add_filter(age_filter)
self.assertFalse(not_filter.is_empty())
self.assertFalse(and_filter.is_empty())
def test_single_clause_and_filter(self):
and_filter = And()
and_filter.add_filter(Exists("value"))
self.assertEquals({"and": [
{"exists": {"field": "value"}}
]}, and_filter.to_query())
def test_empty_and_filter(self):
and_filter = And()
self.assertEquals({"and": []}, and_filter.to_query())
