1 files changed, 29 insertions, 0 deletions
diff --git a/spec/rubocop/cop/api/grape_api_instance_spec.rb b/spec/rubocop/cop/api/grape_api_instance_spec.rb
new file mode 100644
index 00000000000..74f175cb707
--- /dev/null
+++ b/spec/rubocop/cop/api/grape_api_instance_spec.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+require 'rubocop'
+require_relative '../../../../rubocop/cop/api/grape_api_instance'
+
+RSpec.describe RuboCop::Cop::API::GrapeAPIInstance do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+
+  it 'adds an offense when inheriting from Grape::API' do
+    inspect_source(<<~CODE)
+      class SomeAPI < Grape::API
+      end
+    CODE
+
+    expect(cop.offenses.size).to eq(1)
+  end
+
+  it 'does not add an offense when inheriting from Grape::API::Instance' do
+    inspect_source(<<~CODE)
+      class SomeAPI < Grape::API::Instance
+      end
+    CODE
+
+    expect(cop.offenses.size).to be_zero
+  end
+end