Howl :: Spec - howl.ui.Popup

adds opts.css_class to the popover, keeping its own classes

plain = Popup Gtk.Box(Gtk.ORIENTATION_VERTICAL, {})
own_classes = plain.popover.css_classes
plain\release!

popup = Popup Gtk.Box(Gtk.ORIENTATION_VERTICAL, {}), css_class: 'action-popup'
classes = popup.popover.css_classes
assert.includes classes, 'action-popup'
assert.includes classes, cls for cls in *own_classes
popup\release!

(resource management)

child = Gtk.Box Gtk.ORIENTATION_VERTICAL, {}

widgets are collected as they should

o = Popup child
list = setmetatable {o}, __mode: 'v'
o\release!
o = nil
collectgarbage!
assert.is_true list[1] == nil, 'Popup still lives'