From 69ad827e829175bebb985c8afe76174f42fc60bc Mon Sep 17 00:00:00 2001
From: Robert Speicher <rspeicher@gmail.com>
Date: Wed, 8 Feb 2017 17:09:16 -0500
Subject: Add a custom RSpec/SingleLineHook cop

This cop adds an offense when `before`, `after`, or `around` are used as
single-line blocks.
---
 rubocop/cop/rspec/single_line_hook.rb | 36 +++++++++++++++++++++++++++++++++++
 rubocop/rubocop.rb                    |  1 +
 2 files changed, 37 insertions(+)
 create mode 100644 rubocop/cop/rspec/single_line_hook.rb

(limited to 'rubocop')

diff --git a/rubocop/cop/rspec/single_line_hook.rb b/rubocop/cop/rspec/single_line_hook.rb
new file mode 100644
index 00000000000..a156b1d34cf
--- /dev/null
+++ b/rubocop/cop/rspec/single_line_hook.rb
@@ -0,0 +1,36 @@
+module RuboCop
+  module Cop
+    module RSpec
+      # This cop checks for single-line hook blocks
+      #
+      # @example
+      #
+      #   # bad
+      #   before { do_something }
+      #   after(:each) { undo_something }
+      #
+      #   # good
+      #   before do
+      #     do_something
+      #   end
+      #
+      #   after(:each) do
+      #     undo_something
+      #   end
+      class SingleLineHook < RuboCop::Cop::RSpec::Cop
+        MESSAGE = "Don't use single-line hook blocks.".freeze
+
+        def_node_search :rspec_hook?, <<~PATTERN
+          (send nil {:after :around :before} ...)
+        PATTERN
+
+        def on_block(node)
+          return unless rspec_hook?(node)
+          return unless node.single_line?
+
+          add_offense(node, :expression, MESSAGE)
+        end
+      end
+    end
+  end
+end
diff --git a/rubocop/rubocop.rb b/rubocop/rubocop.rb
index 6b8d127dde6..55d7708fa8c 100644
--- a/rubocop/rubocop.rb
+++ b/rubocop/rubocop.rb
@@ -15,3 +15,4 @@ require_relative 'cop/migration/remove_index'
 require_relative 'cop/migration/reversible_add_column_with_default'
 require_relative 'cop/migration/timestamps'
 require_relative 'cop/migration/update_column_in_batches'
+require_relative 'cop/rspec/single_line_hook'
-- 
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