Snippet - assert_yin_yang

Ruby
1

Rubies:

This is a Rails assertion, but any project could use its concept.

It asserts that a Model value is one state before a block, and another
state after:

def assert_yin_yang(object, method, yin, yang, diagnostic = nil)
message = build_message(diagnostic, “<?>#<?>”, object, method)
assert_equal yin, object.send(method), message
yield
object.reload
assert_equal yang, object.send(method), message
end

Detect something switched from false to true like this:

 helmet = shrew.accessories.first

 assert_yin_yang helmet, :active, false, true do
   post :use, :id => helmet.id
 end

Any tips welcome regarding making this more yin-yang-ey!