1 files changed, 62 insertions, 0 deletions
diff --git a/spec/rubocop/cop/performance/active_record_subtransactions_spec.rb b/spec/rubocop/cop/performance/active_record_subtransactions_spec.rb
new file mode 100644
index 00000000000..0da2e30062a
--- /dev/null
+++ b/spec/rubocop/cop/performance/active_record_subtransactions_spec.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+require_relative '../../../../rubocop/cop/performance/active_record_subtransactions'
+
+RSpec.describe RuboCop::Cop::Performance::ActiveRecordSubtransactions do
+  subject(:cop) { described_class.new }
+
+  let(:message) { described_class::MSG }
+
+  context 'when calling #transaction with only requires_new: true' do
+    it 'registers an offense' do
+      expect_offense(<<~RUBY)
+        ApplicationRecord.transaction(requires_new: true) do
+                                      ^^^^^^^^^^^^^^^^^^ #{message}
+          Project.create!(name: 'MyProject')
+        end
+      RUBY
+    end
+  end
+
+  context 'when passing multiple arguments to #transaction, including requires_new: true' do
+    it 'registers an offense' do
+      expect_offense(<<~RUBY)
+        ApplicationRecord.transaction(isolation: :read_committed, requires_new: true) do
+                                                                  ^^^^^^^^^^^^^^^^^^ #{message}
+          Project.create!(name: 'MyProject')
+        end
+      RUBY
+    end
+  end
+
+  context 'when calling #transaction with requires_new: false' do
+    it 'does not register an offense' do
+      expect_no_offenses(<<~RUBY)
+        ApplicationRecord.transaction(requires_new: false) do
+          Project.create!(name: 'MyProject')
+        end
+      RUBY
+    end
+  end
+
+  context 'when calling #transaction with other options' do
+    it 'does not register an offense' do
+      expect_no_offenses(<<~RUBY)
+        ApplicationRecord.transaction(isolation: :read_committed) do
+          Project.create!(name: 'MyProject')
+        end
+      RUBY
+    end
+  end
+
+  context 'when calling #transaction with no arguments' do
+    it 'does not register an offense' do
+      expect_no_offenses(<<~RUBY)
+        ApplicationRecord.transaction do
+          Project.create!(name: 'MyProject')
+        end
+      RUBY
+    end
+  end
+end