Introduce solidus_extension_dev_tools for testing configuration

We had removed the RSpec configuration helpers from here, but this
caused the tests to fail because they relied on that same config.
Using the configuration from solidus_extension_dev_tools fixes the
issue.

.gitignore

@@ -8,3 +8,5 @@
 /spec/reports/
 /tmp/
 /log/
+/spec/
+

Gemfile

@@ -6,5 +6,6 @@ gem 'solidus_core', github: 'solidusio/solidus', branch: branch
 # Specify your gem's dependencies in solidus_support.gemspec
 gemspec
 
+gem 'solidus_extension_dev_tools', github: 'solidusio-contrib/solidus_extension_dev_tools'
 gem 'sprockets-rails'
 gem 'sqlite3'

solidus_support.gemspec

@@ -17,10 +17,11 @@ Gem::Specification.new do |spec|
   spec.files         = `git ls-files -z`.split("\x0")
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '~> 1.14'
-  spec.add_development_dependency 'rake', '~> 10.0'
-  spec.add_development_dependency 'rspec-rails', '~> 3.7'
+  spec.add_development_dependency 'bundler'
+  spec.add_development_dependency 'rake'
+  spec.add_development_dependency 'rspec-rails'
   spec.add_development_dependency 'rubocop'
   spec.add_development_dependency 'rubocop-rspec'
   spec.add_development_dependency 'solidus_core'
+  spec.add_development_dependency 'solidus_extension_dev_tools'
 end

spec/spec_helper.rb

@@ -1,2 +1,2 @@
 require_relative 'support/dummy_app'
-require 'solidus_support/extension/spec_helper'
+require 'solidus_extension_dev_tools/rspec/spec_helper'