Added system tests under Redmine 4

lib/body_tracking/plugin_fixtures_loader.rb

@@ -0,0 +1,10 @@
+module BodyTracking::PluginFixturesLoader
+  def self.included(base)
+    base.class_eval do
+      def self.plugin_fixtures(*symbols)
+        fixtures_dir = File.expand_path('../../test/fixtures/', __FILE__)
+        ActiveRecord::Fixtures.create_fixtures(fixtures_dir, symbols)
+      end
+    end
+  end
+end