def test_key_pop():
"""Can pop an unknown"""
from sherpa.astro.io.meta import Meta
store = Meta()
store['key1'] = True
store['key2'] = False
assert store.pop('key') is None
assert store.keys() == ['key1', 'key2']
def test_key_pop():
"""Can pop a known value"""
from sherpa.astro.io.meta import Meta
store = Meta()
store['key1'] = True
store['key2'] = False
assert store.pop('key1')
assert store.keys() == ['key2']
def test_del_keyword():
"""We can delete a keyword"""
from sherpa.astro.io.meta import Meta
store = Meta()
store['x1'] = 1
store['u1'] = 2
del store['x1']
assert store.keys() == ['u1']
assert store.values() == [2]
def test_add_keyword(value):
"""Can add a keyword"""
from sherpa.astro.io.meta import Meta
store = Meta()
store['key'] = value
assert store.keys() == ['key']
assert store.has_key('key')
assert len(store.values()) == 1
svalue = store['key']
assert svalue == value
def test_del_missing_keyword():
"""We can not delete a keyword that doesn't exist"""
from sherpa.astro.io.meta import Meta
store = Meta()
store['x1'] = 1
store['u1'] = 2
with pytest.raises(KeyError):
del store['y1']
assert store.keys() == ['u1', 'x1']
assert store.values() == [2, 1]
def test_keyword_order():
"""keys are sorted, not based on input order"""
from sherpa.astro.io.meta import Meta
store = Meta()
store['key2'] = 1
store['key1'] = 2
store['a'] = True
store['A'] = False
keys = store.keys()
assert keys == ['A', 'a', 'key1', 'key2']
vals = store.values()
assert vals == [False, True, 2, 1]
def test_empty():
"""An empty store is empty."""
from sherpa.astro.io.meta import Meta
store = Meta()
assert len(store.keys()) == 0