class RuboCop::Cop::RSpec::SingleArgumentMessageChain


allow(foo).to receive(“bar.baz”)
allow(foo).to receive(:bar, :baz)
# also good
allow(foo).to receive(:bar).and_return(42)
# good
allow(foo).to receive_message_chain(:bar).and_return(42)
# bad
@example
Checks that chains of messages contain more than one element.

def autocorrect(node) 

def autocorrect(node)
  lambda do |corrector|
    corrector.replace(node.loc.selector, replacement(node.method_name))
    message_chain(node) do |arg|
      autocorrect_hash_arg(corrector, arg) if single_key_hash?(arg)
    end
  end
end

def autocorrect_hash_arg(corrector, arg) 

def autocorrect_hash_arg(corrector, arg)
  key, value = *arg.children.first
  corrector.replace(arg.loc.expression, key_to_arg(key))
  corrector.insert_after(arg.parent.loc.end,
                         ".and_return(#{value.source})")
end

def key_to_arg(node) 

def key_to_arg(node)
  key, = *node
  node.sym_type? ? ":#{key}" : node.source
end

def message(node) 

def message(node)
  method = node.method_name
  format(MSG, recommended: replacement(method), called: method)
end

def on_send(node) 

def on_send(node)
  message_chain(node) do |arg|
    return if arg.to_s.include?('.')
    return if arg.hash_type? && !single_key_hash?(arg)
    add_offense(node, :selector)
  end
end

def replacement(method) 

def replacement(method)
  method.equal?(:receive_message_chain) ? 'receive' : 'stub'
end