Load our version of the Spree environment

We didn't actually change any logic in our version of the Spree
environment file but if we do that in the future, we want to be sure
that it takes effect. Our file was ignored and not loaded before.

config/initializers/spree.rb

@@ -6,6 +6,7 @@
 # In order to initialize a setting do:
 # config.setting_name = 'new value'
 
+require "spree/core/environment"
 require 'spree/product_filters'
 
 # Due to a bug in ActiveRecord we need to load the tagging code in Gateway which

spec/lib/spree/core/environment_spec.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Spree::Core::Environment do
+  # Our version doesn't add any features we could test.
+  # So we just check that our file is loaded correctly.
+  let(:our_file) { Rails.root.join("lib/spree/core/environment.rb").to_s }
+
+  it "is defined in our code" do
+    file = subject.method(:initialize).source_location.first
+    expect(file).to eq our_file
+  end
+
+  it "used by Spree" do
+    file = Spree::Core::Engine.config.spree.method(:initialize).source_location.first
+    expect(file).to eq our_file
+  end
+end