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Versions: 16
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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module RSpec
# Checks if there is a let/subject that overwrites an existing one.
#
# @example
# # bad
# let(:foo) { bar }
# let(:foo) { baz }
#
# subject(:foo) { bar }
# let(:foo) { baz }
#
# let(:foo) { bar }
# let!(:foo) { baz }
#
# # good
# subject(:test) { something }
# let(:foo) { bar }
# let(:baz) { baz }
# let!(:other) { other }
class OverwritingSetup < Base
MSG = '`%<name>s` is already defined.'
# @!method setup?(node)
def_node_matcher :setup?, block_pattern('{#Helpers.all #Subjects.all}')
# @!method first_argument_name(node)
def_node_matcher :first_argument_name, '(send _ _ ({str sym} $_))'
def on_block(node)
return unless example_group_with_body?(node)
find_duplicates(node.body) do |duplicate, name|
add_offense(
duplicate,
message: format(MSG, name: name)
)
end
end
private
def find_duplicates(node)
setup_expressions = Set.new
node.each_child_node(:block) do |child|
next unless common_setup?(child)
name = if child.send_node.arguments?
first_argument_name(child.send_node).to_sym
else
:subject
end
yield child, name unless setup_expressions.add?(name)
end
end
def common_setup?(node)
return false unless setup?(node)
# Search only for setup with basic_literal arguments (e.g. :sym, :str)
# or no arguments at all.
node.send_node.arguments.all?(&:basic_literal?)
end
end
end
end
end
Version data entries
16 entries across 14 versions & 2 rubygems