feat: Add Platform APIs (#1456)

spec/models/platform_app_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require Rails.root.join 'spec/models/concerns/access_tokenable_spec.rb'
+
+RSpec.describe PlatformApp do
+  let(:platform_app) { create(:platform_app) }
+
+  context 'with validations' do
+    it { is_expected.to validate_presence_of(:name) }
+  end
+
+  context 'with associations' do
+    it { is_expected.to have_many(:platform_app_permissibles) }
+  end
+
+  describe 'with concerns' do
+    it_behaves_like 'access_tokenable'
+  end
+
+  describe 'with factories' do
+    it { expect(platform_app).present? }
+  end
+end