def test_type_change(self):
"""Exception is raised if replacement type differs."""
with self.assertRaises(TypeError):
update = jmes.Update("metadata", "root().TM")
update.run(deepcopy(SAMPLE_STATE))
with self.assertRaises(TypeError):
update = jmes.Update("templates", "root().TM")
update.run(deepcopy(SAMPLE_STATE))
def test_update_dict(self):
"""When value_expr gives a dict, it is updated."""
update = jmes.Update("metadata", "{qux: `123`}")
results = update.run(deepcopy(SAMPLE_STATE))
self.assertEqual(results, {
"TM": 0.5,
"templates": [
{"TM": 0.3, "name": "foo"},
{"TM": 0.6, "name": "bar"},
],
"metadata": {"date": "1970-01-01", "qux": 123}
})
def test_invalid_selection(self):
"""Can only update dicts and lists."""
with self.assertRaises(TypeError):
update = jmes.Update("TM", "`[1,2,3]`")
update.run(deepcopy(SAMPLE_STATE))
def test_update_identity(self):
"""Updating identical elements does nothing."""
update = jmes.Update("@", "@")
results = update.run(deepcopy(SAMPLE_STATE))
self.assertEqual(results, SAMPLE_STATE)