def test_iter_defaults():
"""It doesn't yield keys from defaults."""
this = ODD(a=1)
that = ODD(b=2)
this.defaults = dict(c=3)
that.defaults = dict(d=4)
a = DictTree(this, that)
assert list(sorted(a)) == ['a', 'b']
def test_defaults_getitem_dict():
"""It returns defaults if a value isn't set."""
this = ODD()
that = ODD(a=2)
both = DictTree(this, that)
# default in this gets overridden by value in that
this.defaults_ = dict(a=1)
that.defaults_ = dict()
assert both['a'] == 2
# default in first dict gets priority
this.defaults_ = dict(b=1)
that.defaults_ = dict(b=2)
assert both['b'] == 1
def test_defaults_getitem_nested():
"""It preserves the defaults_ behaviour of ODD in nested dicts."""
this = ODD()
that = ODD(a=2)
both = DictTree(dict(a=this), dict(a=that))
# default in this gets overridden by value in that
this.defaults_ = dict(a=1)
that.defaults_ = dict()
assert both['a']['a'] == 2
# default in first dict gets priority
this.defaults_ = dict(b=1)
that.defaults_ = dict(b=2)
assert both['a']['b'] == 1
def test_odd_getitem():
"""It returns default values if none of the dicts contains the key."""
this = ODD(a=1)
this.defaults_ = dict(c=3)
that = ODD(b=2)
that.defaults_ = dict(d=4)
both = DictTree(this, that)
# key from this
assert both['a'] == 1
# key from that
assert both['b'] == 2
# default from this
assert both['c'] == 3
# default from that
assert both['d'] == 4
# missing value
with pytest.raises(KeyError):
both['e']