1 files changed, 62 insertions, 0 deletions
diff --git a/spec/rubocop/cop/api/grape_array_missing_coerce_spec.rb b/spec/rubocop/cop/api/grape_array_missing_coerce_spec.rb
new file mode 100644
index 00000000000..c7bb8255398
--- /dev/null
+++ b/spec/rubocop/cop/api/grape_array_missing_coerce_spec.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+require 'rubocop'
+require_relative '../../../../rubocop/cop/api/grape_array_missing_coerce'
+
+RSpec.describe RuboCop::Cop::API::GrapeArrayMissingCoerce do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+
+  it 'adds an offense with a required parameter' do
+    inspect_source(<<~CODE)
+      class SomeAPI < Grape::API::Instance
+        params do
+          requires :values, type: Array[String]
+        end
+      end
+    CODE
+
+    expect(cop.offenses.size).to eq(1)
+  end
+
+  it 'adds an offense with an optional parameter' do
+    inspect_source(<<~CODE)
+      class SomeAPI < Grape::API::Instance
+        params do
+          optional :values, type: Array[String]
+        end
+      end
+    CODE
+
+    expect(cop.offenses.size).to eq(1)
+  end
+
+  it 'does not add an offense' do
+    inspect_source(<<~CODE)
+      class SomeAPI < Grape::API::Instance
+        params do
+          requires :values, type: Array[String], coerce_with: ->(val) { val.split(',').map(&:strip) }
+          requires :milestone, type: String, desc: 'Milestone title'
+          optional :assignee_id, types: [Integer, String], integer_none_any: true,
+            desc: 'Return issues which are assigned to the user with the given ID'
+        end
+      end
+    CODE
+
+    expect(cop.offenses.size).to be_zero
+  end
+
+  it 'does not add an offense for unrelated classes' do
+    inspect_source(<<~CODE)
+      class SomeClass
+        params do
+          requires :values, type: Array[String]
+        end
+      end
+    CODE
+
+    expect(cop.offenses.size).to be_zero
+  end
+end