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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/>.
from unittest.mock import Mock, patch
import pytest
from opendrop.utility.bindable import abc, VariableBindable, AccessorBindable
class TestBindable:
def setup_method(self) -> None:
self.bindable = StubBindable()
def test_get(self) -> None:
with patch.object(self.bindable, '_get_value') as get_value:
get_value.assert_not_called()
value = self.bindable.get()
assert value == get_value.return_value
get_value.assert_called_once_with()
def test_set(self) -> None:
get_value = Mock(return_value=0)
set_value = Mock()
with patch.multiple(self.bindable, _get_value=get_value, _set_value=set_value):
get_value.assert_not_called()
self.bindable.set(123)
set_value.assert_called_once_with(123)
class TestBindable_WithUnimplementedGetter:
def setup_method(self) -> None:
self.bindable = StubBindable()
patcher = patch.object(self.bindable, '_get_value', Mock(side_effect=NotImplementedError))
patcher.start()
def test_set(self) -> None:
with patch.object(self.bindable, '_set_value') as set_value:
self.bindable.set(123)
set_value.assert_called_once_with(123)
class TestBindable_OnChanged:
def setup_method(self):
self.bindable = StubBindable()
self.changed_callback = Mock()
self.bindable.on_changed.connect(self.changed_callback)
def test_on_changed_fires_after_set(self):
self.changed_callback.assert_not_called()
self.bindable.set(123)
self.changed_callback.assert_called_once_with()
def test_on_changed_does_not_fire_if_set_to_same_value(self):
value = object()
with patch.object(self.bindable, '_get_value', Mock(return_value=value)):
self.bindable.set(value)
self.changed_callback.assert_not_called()
class TestBindable_OnChanged_With_CustomEqualityChecker:
def setup_method(self):
self.check_equals = Mock()
self.bindable = StubBindable(check_equals=self.check_equals)
self.changed_callback = Mock()
self.bindable.on_changed.connect(self.changed_callback)
def test_check_equals_is_passed_old_value_and_new_value(self):
with patch.object(self.bindable, '_get_value', Mock(return_value=123)):
self.bindable.set(456)
self.check_equals.assert_called_with(123, 456)
def test_on_changed_does_not_fire_if_check_equals_returns_true(self):
self.check_equals.return_value = True
self.bindable.set(123)
self.changed_callback.assert_not_called()
def test_on_changed_fires_if_check_equals_returns_false(self):
self.check_equals.return_value = False
self.changed_callback.assert_not_called()
self.bindable.set(123)
self.changed_callback.assert_called_once_with()
class TestVariableBindable:
def setup_method(self):
self.initial = object()
self.bindable = VariableBindable(self.initial)
def test_initial_value(self):
assert self.bindable.get() == self.initial
def test_set_and_get(self):
new_value = object()
self.bindable.set(new_value)
assert self.bindable.get() == new_value
class TestAccessorBindable_WithGetterAndSetter:
def setup_method(self):
self.getter = Mock()
self.setter = Mock()
self.bindable = AccessorBindable(getter=self.getter, setter=self.setter)
def test_get(self):
self.getter.assert_not_called()
value = self.bindable.get()
assert value == self.getter.return_value
self.getter.assert_called_once_with()
def test_set(self):
self.setter.assert_not_called()
new_value = object()
self.bindable.set(new_value)
self.setter.assert_called_once_with(new_value)
def test_poke(self):
on_changed_callback = Mock()
self.bindable.on_changed.connect(on_changed_callback)
self.bindable.poke()
on_changed_callback.assert_called_once_with()
class TestAccessorBindable_WithNoSetter:
def setup_method(self):
self.bindable = AccessorBindable(getter=Mock())
def test_set(self):
with pytest.raises(NotImplementedError):
self.bindable.set(123)
class TestAccessorBindable_WithNoGetter:
def setup_method(self):
self.bindable = AccessorBindable(setter=Mock())
def test_get(self):
with pytest.raises(NotImplementedError):
self.bindable.get()
class StubBindable(abc.Bindable):
def _get_value(self):
pass
def _set_value(self, new_value):
pass
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