def test_deepcopy():
stack = Metastack()
stack.set_layer(0, 'base', {'foo': {'bar': {1, 2, 3}}})
foo = stack.get(('foo', ))
foo['bar'].add(4)
assert stack.get(('foo', 'bar')) == {1, 2, 3}
del foo['bar']
assert stack.get(('foo', 'bar'))
def test_pop_layer():
stack = Metastack()
stack.set_layer(0, 'overlay', {'foo': 'bar'})
stack.set_layer(0, 'overlay', {'foo': 'baz'})
assert stack.pop_layer(0, 'overlay') == {'foo': 'baz'}
with raises(KeyError):
stack.get(('foo', ))
assert stack.pop_layer(0, 'overlay') == {}
assert stack.pop_layer(0, 'unknown') == {}
assert stack.pop_layer(47, 'unknown') == {}
def test_as_dict():
stack = Metastack()
stack.set_layer(
0, 'base', {
'bool': True,
'bytes': b'howdy',
'dict': {
'1': 2
},
'int': 1,
'list': [1],
'none': None,
'set': {1},
'str': 'howdy',
'tuple': (1, 2),
})
stack.set_layer(0, 'overlay1', {'int': 1000})
stack.set_layer(0, 'overlay2', {'list': [2]})
stack.set_layer(0, 'overlay3', {'new_element': True})
assert stack.as_dict() == {
'bool': True,
'bytes': b'howdy',
'dict': {
'1': 2
},
'int': 1000,
'list': [1, 2],
'new_element': True,
'none': None,
'set': {1},
'str': 'howdy',
'tuple': (1, 2),
}
def test_merge_sets_with_multiple_used_layers():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_set': {1, 2}, 'a_value': 5}})
stack.set_layer(0, 'overlay1', {'something': {'a_set': {3}}})
stack.set_layer(0, 'overlay2', {'something': {'a_set': {4}}})
stack.set_layer(0, 'overlay3', {'something': {'a_set': {6, 5}}})
assert stack.get(('something', 'a_set')) == {1, 2, 3, 4, 5, 6}
def test_merge_dicts():
stack = Metastack()
stack.set_layer(0, 'overlay1', {'something': {'a_value': 3}})
stack.set_layer(0, 'overlay2', {'something': {'another_value': 5}})
stack.set_layer(0, 'overlay3', {'something': {'this': {'and': 'that'}}})
stack.set_layer(0, 'overlay4', {'something': {'a_set': {1, 2}}})
stack.set_layer(0, 'overlay5', {'something': {'a_set': {3, 4}}})
assert stack.get(('something', )) == {
'a_set': {1, 2, 3, 4},
'a_value': 3,
'another_value': 5,
'this': {
'and': 'that',
},
}
def test_merge_lists_with_multiple_used_layers():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_list': [1, 2], 'a_value': 5}})
stack.set_layer(0, 'overlay1', {'something': {'a_list': [3]}})
stack.set_layer(0, 'overlay2', {'something': {'a_list': [4]}})
stack.set_layer(0, 'overlay3', {'something': {'a_list': [6, 5]}})
assert sorted(stack.get(
('something', 'a_list'))) == sorted([1, 2, 3, 4, 5, 6])
def test_as_blame():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_list': [1, 2], 'a_value': 5}})
stack.set_layer(0, 'overlay', {'something': {'a_list': [3]}})
stack.set_layer(0, 'unrelated', {'something': {'another_value': 10}})
assert stack.as_blame() == {
('something', ): ['base', 'overlay', 'unrelated'],
('something', 'a_list'): ['base', 'overlay'],
('something', 'a_value'): ['base'],
('something', 'another_value'): ['unrelated'],
}
def test_update_layer_for_new_value():
stack = Metastack()
stack.set_layer(0, 'base', {'foo': 'bar'})
stack.set_layer(0, 'overlay', {'something': 123})
assert stack.get(('foo', )) == 'bar'
with raises(KeyError):
assert stack.get(('boing', ))
assert stack.get(('something', )) == 123
stack.set_layer(0, 'overlay', {'something': 456})
assert stack.get(('foo', )) == 'bar'
with raises(KeyError):
assert stack.get(('boing', ))
assert stack.get(('something', )) == 456
def test_merge_lists_multi_layers():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_list': [1, 2], 'a_value': 5}})
stack.set_layer(0, 'overlay', {'something': {'a_list': [3]}})
stack.set_layer(0, 'unrelated', {'something': {'another_value': 10}})
# Objects in Metastacks are frozen. This converts lists to tuples.
# Unlike set and frozenset, list and tuple doesn't naturally support
# "is equal".
#
# This is acceptable, because in metaprocs people are expected to
# maybe check if something is in a list and maybe access some item
# of a list. All that works. Operations like .append() do not work
# and they are not supposed to.
assert len(stack.get(('something', 'a_list'))) == 3
assert stack.get(('something', 'a_list'))[0] == 1
assert stack.get(('something', 'a_list'))[1] == 2
assert stack.get(('something', 'a_list'))[2] == 3
def test_merge_sets_with_empty_layer():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_set': {1, 2}, 'a_value': 5}})
stack.set_layer(0, 'overlay1', {'something': {'a_set': set()}})
stack.set_layer(0, 'overlay2', {'something': {'a_set': {3}}})
assert stack.get(('something', 'a_set')) == {1, 2, 3}
def test_merge_lists_with_empty_layer():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_list': [1, 2], 'a_value': 5}})
stack.set_layer(0, 'overlay1', {'something': {'a_list': []}})
stack.set_layer(0, 'overlay2', {'something': {'a_list': [3]}})
assert sorted(stack.get(('something', 'a_list'))) == sorted([1, 2, 3])
def test_merge_sets_multi_layers():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_set': {1, 2}, 'a_value': 5}})
stack.set_layer(0, 'overlay', {'something': {'a_set': {3}}})
stack.set_layer(0, 'unrelated', {'something': {'another_value': 10}})
assert stack.get(('something', 'a_set')) == {1, 2, 3}
def test_overlay_value_multi_layers():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_list': [1, 2], 'a_value': 5}})
stack.set_layer(0, 'overlay', {'something': {'a_value': 10}})
stack.set_layer(0, 'unrelated', {'something': {'another_value': 10}})
assert stack.get(('something', 'a_value')) == 10
def test_overlay_value():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'a_list': [1, 2], 'a_value': 5}})
stack.set_layer(0, 'overlay', {'something': {'a_value': 10}})
assert stack.get(('something', 'a_value')) == 10
def test_get_subpath():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'in': {'a': 'subpath'}}})
assert stack.get(('something', 'in', 'a')) == 'subpath'
def test_requesting_empty_path():
stack = Metastack()
stack.set_layer(0, 'base', {'foo': {'bar': 'baz'}})
assert stack.get(tuple()) == {'foo': {'bar': 'baz'}}
def test_has_no_subpath():
stack = Metastack()
stack.set_layer(0, 'base', {'something': {'in': {}}})
with raises(KeyError):
stack.get(('something', 'in', 'a', 'path'))
def test_get_top():
stack = Metastack()
stack.set_layer(0, 'base', {'something': 123})
assert stack.get(('something', )) == 123
def test_atomic_in_layer():
stack = Metastack()
stack.set_layer(0, 'base', {'list': [1, 2, 3]})
stack.set_layer(0, 'overlay', {'list': atomic([4])})
assert list(stack.get(('list', ))) == [4]