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# Copyright © 2020, Joseph Berry, Rico Tabor (opendrop.dev@gmail.com)
# OpenDrop is released under the GNU GPL License. You are free to
# modify and distribute the code, but always under the same license
#
# If you use this software in your research, please cite the following
# journal articles:
#
# J. D. Berry, M. J. Neeson, R. R. Dagastine, D. Y. C. Chan and
# R. F. Tabor, Measurement of surface and interfacial tension using
# pendant drop tensiometry. Journal of Colloid and Interface Science 454
# (2015) 226–237. https://doi.org/10.1016/j.jcis.2015.05.012
#
# E. Huang, T. Denning, A. Skoufis, J. Qi, R. R. Dagastine, R. F. Tabor
# and J. D. Berry, OpenDrop: Open-source software for pendant drop
# tensiometry & contact angle measurements, submitted to the Journal of
# Open Source Software
#
# These citations help us not only to understand who is using and
# developing OpenDrop, and for what purpose, but also to justify
# continued development of this code and other open source resources.
#
# OpenDrop is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE. See the GNU General Public License for more details. You
# should have received a copy of the GNU General Public License along
# with this software. If not, see <https://www.gnu.org/licenses/>.
import gc
import weakref
from unittest.mock import Mock
import pytest
from opendrop.utility.bindable.binding import Binding
from opendrop.utility.events import Event
class TestBinding:
@pytest.fixture(autouse=True)
def fixture(self):
self.src_bindable = MockBindable()
self.dst_bindable = MockBindable()
self.binding = Binding(src=self.src_bindable, dst=self.dst_bindable)
def test_dst_is_updated_with_src_value(self):
self.dst_bindable.set.assert_called_once_with(
self.src_bindable.get.return_value)
def test_src_poke(self):
self.src_bindable.reset()
self.dst_bindable.reset()
self.src_bindable.poke()
self.dst_bindable.set.assert_called_once_with(
self.src_bindable.get.return_value)
def test_dst_poke(self):
self.src_bindable.reset()
self.dst_bindable.reset()
self.dst_bindable.poke()
self.src_bindable.set.assert_called_once_with(
self.dst_bindable.get.return_value)
def test_unbind_stops_propagating_changes(self):
self.src_bindable.reset()
self.dst_bindable.reset()
self.binding.unbind()
self.src_bindable.poke()
self.dst_bindable.poke()
self.src_bindable.get.assert_not_called()
self.src_bindable.set.assert_not_called()
self.dst_bindable.get.assert_not_called()
self.dst_bindable.set.assert_not_called()
def test_unbind_deletes_references_to_src_and_dst(self):
src_bindable_wr = weakref.ref(self.src_bindable)
dst_bindable_wr = weakref.ref(self.dst_bindable)
del self.src_bindable
del self.dst_bindable
gc.collect()
assert src_bindable_wr() is not None
assert dst_bindable_wr() is not None
self.binding.unbind()
gc.collect()
assert src_bindable_wr() is None
assert dst_bindable_wr() is None
class TestBinding_With_ToDstTransform:
@pytest.fixture(autouse=True)
def fixture(self):
self.src_bindable = MockBindable()
self.dst_bindable = MockBindable()
# Can't use a Mock object for to_dst() since it can sometimes have global referrers that prevent it from being
# garbage collected (which is required for one of the test cases)
def to_dst(x):
self.to_dst_called_with.append(x)
return self.to_dst_return_value
self.to_dst_called_with = []
self.to_dst_return_value = object()
self.to_dst = to_dst
self.binding = Binding(src=self.src_bindable, dst=self.dst_bindable, to_dst=self.to_dst)
def test_dst_is_updated_with_src_value(self):
self.dst_bindable.set.assert_called_once_with(
self.to_dst_return_value)
assert self.to_dst_called_with == [self.src_bindable.get.return_value]
def test_src_poke(self):
self.src_bindable.reset()
self.dst_bindable.reset()
self.to_dst_called_with.clear()
self.src_bindable.poke()
self.dst_bindable.set.assert_called_once_with(
self.to_dst_return_value)
assert self.to_dst_called_with == [self.src_bindable.get.return_value]
def test_unbind_deletes_references_to_to_dst(self):
to_dst_wr = weakref.ref(self.to_dst)
del self.to_dst
gc.collect()
assert to_dst_wr() is not None
self.binding.unbind()
gc.collect()
assert to_dst_wr() is None
class TestBinding_With_ToSrcTransform:
@pytest.fixture(autouse=True)
def fixture(self):
self.src_bindable = MockBindable()
self.dst_bindable = MockBindable()
# Can't use a Mock object for to_dst() since it can sometimes have global referrers that prevent it from being
# garbage collected (which is required for one of the test cases)
def to_src(x):
self.to_src_called_with.append(x)
return self.to_src_return_value
self.to_src_called_with = []
self.to_src_return_value = object()
self.to_src = to_src
self.binding = Binding(src=self.src_bindable, dst=self.dst_bindable, to_src=self.to_src)
def test_dst_poke(self):
self.src_bindable.reset()
self.dst_bindable.reset()
self.to_src_called_with.clear()
self.dst_bindable.poke()
self.src_bindable.set.assert_called_once_with(
self.to_src_return_value)
assert self.to_src_called_with == [self.dst_bindable.get.return_value]
def test_unbind_deletes_references_to_to_src(self):
to_src_wr = weakref.ref(self.to_src)
del self.to_src
gc.collect()
assert to_src_wr() is not None
self.binding.unbind()
gc.collect()
assert to_src_wr() is None
class TestBinding_OneWay:
@pytest.fixture(autouse=True)
def fixture(self):
self.src_bindable = MockBindable()
self.dst_bindable = MockBindable()
self.binding = Binding(src=self.src_bindable, dst=self.dst_bindable, one_way=True)
self.src_bindable.reset()
self.dst_bindable.reset()
def test_src_poke(self):
self.src_bindable.poke()
self.dst_bindable.set.assert_called_once_with(
self.src_bindable.get.return_value)
def test_dst_poke(self):
self.dst_bindable.poke()
self.src_bindable.set.assert_not_called()
class MockBindable:
def __init__(self):
self.on_changed = Event()
self.get = Mock()
self.set = Mock()
def poke(self) -> None:
self.on_changed.fire()
def reset(self):
self.get.reset_mock()
self.set.reset_mock()
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