Add a custom RSpec/SingleLineHook cop

This cop adds an offense when `before`, `after`, or `around` are used as
single-line blocks.

1 files changed, 67 insertions, 0 deletions

diff --git a/spec/rubocop/cop/rspec/single_line_hook_spec.rb b/spec/rubocop/cop/rspec/single_line_hook_spec.rb
new file mode 100644
index 00000000000..f3eb8de63ac
--- /dev/null
+++ b/spec/rubocop/cop/rspec/single_line_hook_spec.rb
@@ -0,0 +1,67 @@
+require 'spec_helper'
+
+require 'rubocop'
+require 'rubocop/rspec/support'
+require 'rubocop-rspec'
+
+require_relative '../../../../rubocop/cop/rspec/single_line_hook'
+
+describe RuboCop::Cop::RSpec::SingleLineHook do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+
+  # Override `CopHelper#inspect_source` to always appear to be in a spec file,
+  # so that our RSpec-only cop actually runs
+  def inspect_source(*args)
+    super(*args, 'foo_spec.rb')
+  end
+
+  it 'registers an offense for a single-line `before` block' do
+    inspect_source(cop, 'before { do_something }')
+
+    expect(cop.offenses.size).to eq(1)
+    expect(cop.offenses.map(&:line)).to eq([1])
+    expect(cop.highlights).to eq(['before { do_something }'])
+  end
+
+  it 'registers an offense for a single-line `after` block' do
+    inspect_source(cop, 'after(:each) { undo_something }')
+
+    expect(cop.offenses.size).to eq(1)
+    expect(cop.offenses.map(&:line)).to eq([1])
+    expect(cop.highlights).to eq(['after(:each) { undo_something }'])
+  end
+
+  it 'registers an offense for a single-line `around` block' do
+    inspect_source(cop, 'around { |ex| do_something_else }')
+
+    expect(cop.offenses.size).to eq(1)
+    expect(cop.offenses.map(&:line)).to eq([1])
+    expect(cop.highlights).to eq(['around { |ex| do_something_else }'])
+  end
+
+  it 'ignores a multi-line `before` block' do
+    inspect_source(cop, ['before do',
+                         '  do_something',
+                         'end'])
+
+    expect(cop.offenses.size).to eq(0)
+  end
+
+  it 'ignores a multi-line `after` block' do
+    inspect_source(cop, ['after(:each) do',
+                         '  undo_something',
+                         'end'])
+
+    expect(cop.offenses.size).to eq(0)
+  end
+
+  it 'ignores a multi-line `around` block' do
+    inspect_source(cop, ['around do |ex|',
+                         '  do_something_else',
+                         'end'])
+
+    expect(cop.offenses.size).to eq(0)
+  end
+end