[Rails] strange assertion result in functional test

I am testing the 'settings' action, in my Blog controller

def settings
@blog = Blog.find(params[:id])
@setting_form = "settings"
end

I wrote the following assertions :

get :settings, :id => @blog[:id]
assert_not_nil assigns(:blog)
assert_equal "settings", assigns(:setting_form)

but I get a failure on the assigns(:setting_form) assertion, with diff
nil ... strange ?? what's up ? any clue ?
<> expected but was
<>
diff:
nil

thanks for our feedback

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