def test_link_different(self):
"""Verify two traitlets of different types can be linked together using link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
class B(HasTraits):
count = Int()
a = A(value=9)
b = B(count=8)
# Conenct the two classes.
c = directional_link((a, "value"), (b, "count"))
# Make sure the values are the same at the point of linking.
self.assertEqual(a.value, b.count)
# Change one the value of the source and check that it synchronizes the target.
a.value = 5
self.assertEqual(b.count, 5)
# Change one the value of the target and check that it has no impact on the source
b.value = 6
self.assertEqual(a.value, 5)
def test_link_different(self):
"""Verify two traitlets of different types can be linked together using link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
class B(HasTraits):
count = Int()
a = A(value=9)
b = B(count=8)
# Conenct the two classes.
c = directional_link((a, 'value'), (b, 'count'))
# Make sure the values are the same at the point of linking.
self.assertEqual(a.value, b.count)
# Change one the value of the source and check that it synchronizes the target.
a.value = 5
self.assertEqual(b.count, 5)
# Change one the value of the target and check that it has no impact on the source
b.value = 6
self.assertEqual(a.value, 5)
def test_validate_args(self):
class A(HasTraits):
value = Int()
class B(HasTraits):
count = Int()
a = A(value=9)
b = B(count=8)
b.value = 5
with self.assertRaises(TypeError):
directional_link((a, 'value'))
with self.assertRaises(TypeError):
directional_link((a, 'value', 'count'), (b, 'count'))
with self.assertRaises(TypeError):
directional_link((a, 'value'), (b, 'value'))
with self.assertRaises(TypeError):
directional_link((a, 'traits'), (b, 'count'))
def test_unlink(self):
"""Verify two linked traitlets can be unlinked."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Connect the two classes.
c = directional_link((a, 'value'), (b, 'value'))
a.value = 4
c.unlink()
# Change one of the values to make sure they don't stay in sync.
a.value = 5
self.assertNotEqual(a.value, b.value)
def test_unlink(self):
"""Verify two linked traitlets can be unlinked."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Connect the two classes.
c = directional_link((a, 'value'), (b, 'value'))
a.value = 4
c.unlink()
# Change one of the values to make sure they don't stay in sync.
a.value = 5
self.assertNotEqual(a.value, b.value)
def test_validate_args(self):
class A(HasTraits):
value = Int()
class B(HasTraits):
count = Int()
a = A(value=9)
b = B(count=8)
b.value = 5
with self.assertRaises(TypeError):
directional_link((a, 'value'))
with self.assertRaises(TypeError):
directional_link((a, 'value', 'count'), (b, 'count'))
with self.assertRaises(TypeError):
directional_link((a, 'value'), (b, 'value'))
with self.assertRaises(TypeError):
directional_link((a, 'traits'), (b, 'count'))
def test_validate_args(self):
class A(HasTraits):
value = Int()
class B(HasTraits):
count = Int()
a = A(value=9)
b = B(count=8)
b.value = 5
with self.assertRaises(TypeError):
directional_link((a, "value"))
with self.assertRaises(TypeError):
directional_link((a, "value", "count"), (b, "count"))
with self.assertRaises(TypeError):
directional_link((a, "value"), (b, "value"))
with self.assertRaises(TypeError):
directional_link((a, "traits"), (b, "count"))
def test_connect_same(self):
"""Verify two traitlets of the same type can be linked together using directional_link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Conenct the two classes.
c = directional_link((a, 'value'), (b, 'value'))
# Make sure the values are the same at the point of linking.
self.assertEqual(a.value, b.value)
# Change one the value of the source and check that it synchronizes the target.
a.value = 5
self.assertEqual(b.value, 5)
# Change one the value of the target and check that it has no impact on the source
b.value = 6
self.assertEqual(a.value, 5)
