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require 'cases/helper'
require 'models/observers'
class ObserverArrayTest < ActiveModel::TestCase
def teardown
ORM.observers.enable :all
Budget.observers.enable :all
Widget.observers.enable :all
end
def assert_observer_notified(model_class, observer_class)
observer_class.instance.before_save_invocations.clear
model_instance = model_class.new
model_instance.save
assert_equal [model_instance], observer_class.instance.before_save_invocations
end
def assert_observer_not_notified(model_class, observer_class)
observer_class.instance.before_save_invocations.clear
model_instance = model_class.new
model_instance.save
assert_equal [], observer_class.instance.before_save_invocations
end
test "all observers are enabled by default" do
assert_observer_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
test "can disable individual observers using a class constant" do
ORM.observers.disable WidgetObserver
assert_observer_not_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
test "can disable individual observers using a symbol" do
ORM.observers.disable :budget_observer
assert_observer_notified Widget, WidgetObserver
assert_observer_not_notified Budget, BudgetObserver
assert_observer_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
test "can disable all observers using :all" do
ORM.observers.disable :all
assert_observer_not_notified Widget, WidgetObserver
assert_observer_not_notified Budget, BudgetObserver
assert_observer_not_notified Widget, AuditTrail
assert_observer_not_notified Budget, AuditTrail
end
test "can disable observers on individual models without affecting observers on other models" do
Widget.observers.disable :all
assert_observer_not_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_not_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
test "can disable observers for the duration of a block" do
yielded = false
ORM.observers.disable :budget_observer do
yielded = true
assert_observer_notified Widget, WidgetObserver
assert_observer_not_notified Budget, BudgetObserver
assert_observer_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
assert yielded
assert_observer_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
test "can enable observers for the duration of a block" do
yielded = false
Widget.observers.disable :all
Widget.observers.enable :all do
yielded = true
assert_observer_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
assert yielded
assert_observer_not_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_not_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
test "raises an appropriate error when a developer accidentally enables or disables the wrong class (i.e. Widget instead of WidgetObserver)" do
assert_raise ArgumentError do
ORM.observers.enable :widget
end
assert_raise ArgumentError do
ORM.observers.enable Widget
end
assert_raise ArgumentError do
ORM.observers.disable :widget
end
assert_raise ArgumentError do
ORM.observers.disable Widget
end
end
test "allows #enable at the superclass level to override #disable at the subclass level when called last" do
Widget.observers.disable :all
ORM.observers.enable :all
assert_observer_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
test "allows #disable at the superclass level to override #enable at the subclass level when called last" do
Budget.observers.enable :audit_trail
ORM.observers.disable :audit_trail
assert_observer_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_not_notified Widget, AuditTrail
assert_observer_not_notified Budget, AuditTrail
end
test "can use the block form at different levels of the hierarchy" do
yielded = false
Widget.observers.disable :all
ORM.observers.enable :all do
yielded = true
assert_observer_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
assert yielded
assert_observer_not_notified Widget, WidgetObserver
assert_observer_notified Budget, BudgetObserver
assert_observer_not_notified Widget, AuditTrail
assert_observer_notified Budget, AuditTrail
end
end
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