def test_watcher_variable_1 (self):
test = NotifyTestObject ()
watcher = WatcherVariable ()
watcher.store (test.simple_handler)
variable = Variable ('abc')
watcher.watch (variable)
self.assert_(watcher.watched_variable is variable)
variable.value = 60
test.assert_results (None, 'abc', 60)
def test_watcher_variable_2 (self):
test = NotifyTestObject ()
variable1 = Variable ([])
variable2 = Variable ('string')
variable3 = Variable ('string')
watcher = WatcherVariable (variable1)
watcher.store (test.simple_handler)
watcher.watch (variable2)
watcher.watch (variable3)
watcher.watch (None)
self.assert_(watcher.watched_variable is None)
# Later two watch() calls must not change watcher's value.
test.assert_results ([], 'string', None)
def test_watcher_variable_error_3 (self):
variable = Variable ()
watcher = WatcherVariable (variable)
self.assertRaises (ValueError, lambda: watcher.watch (watcher))
self.assert_ (watcher.watched_variable is variable)
def test_watcher_variable_error_2 (self):
watcher = WatcherVariable ()
self.assertRaises (TypeError, lambda: watcher.watch (25))