Add failing test

spec/rspec/scheme_merger_spec.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'schema merger spec' do
+  include SpecHelper
+
+  describe 'mixed symbol and strings' do
+    let(:base) do
+      {
+        'n' => 1,
+        'required' => %w[foo bar],
+        'a' => {
+          b1: 1,
+          b2: %w[foo bar],
+          'b3' => {
+            'c1' => 2,
+            c2: 3,
+          },
+        },
+      }
+    end
+
+    let(:spec) do
+      {
+        n: 1,
+        required: ['buz'],
+        a: {
+          'b1' => 1,
+          'b2' => %w[foo bar],
+          b3: {
+            c1: 2,
+            'c2' => 3,
+          },
+        },
+      }
+    end
+
+    it 'normalize keys to symbol' do
+      result = RSpec::OpenAPI::SchemaMerger.merge!(base, spec)
+      expect(result).to eq({
+                             n: 1,
+                             required: [],
+                             a: {
+                               b1: 1,
+                               b2: %w[foo bar],
+                               b3: {
+                                 c1: 2,
+                                 c2: 3,
+                               },
+                             },
+                           })
+    end
+  end
+end