extended Docker::Container with utility methods

spec/lib/docker_container_mixin_spec.rb

@@ -0,0 +1,11 @@
+require 'rails_helper'
+
+describe DockerContainerMixin do
+  [:binds, :port_bindings].each do |method|
+    describe "##{method}" do
+      it 'is defined for Docker::Container' do
+        expect(Docker::Container.instance_methods).to include(method)
+      end
+    end
+  end
+end