Merge pull request #1990 from rspec/rails_52_improvements

Rails 52 improvements

Author: JonRowe

.travis.yml

@@ -71,20 +71,24 @@ matrix:
       env: RAILS_VERSION=5-0-stable
     - rvm: 2.3.7
       env: RAILS_VERSION=5.1.0
+    - rvm: 2.3.7
+      env: RAILS_VERSION=5.2.0
     - rvm: 2.4.4
       env: RAILS_VERSION=master
     - rvm: 2.4.4
       env: RAILS_VERSION=5-0-stable
     - rvm: 2.4.4
       env: RAILS_VERSION=5.1.0
+    - rvm: 2.4.4
+      env: RAILS_VERSION=5.2.0
     - rvm: 2.5.1
       env: RAILS_VERSION=master
     - rvm: 2.5.1
       env: RAILS_VERSION=5-0-stable
     - rvm: 2.5.1
       env: RAILS_VERSION=5.1.0
-    - rvm: 2.4.2
-      env: RAILS_VERSION=5.2.0.rc1
+    - rvm: 2.5.1
+      env: RAILS_VERSION=5.2.0
   exclude:
     # 3.0.x is not supported on MRI 2.0+
     - rvm: 2.0.0

lib/rspec/rails/example/system_example_group.rb

@@ -52,9 +52,9 @@ def app
           require 'action_dispatch/system_test_case'
         # rubocop:disable Lint/HandleExceptions
         rescue LoadError => e
-          p e
           # rubocop:enable Lint/HandleExceptions
           abort """
+            LoadError: #{e.message}
             System test integration requires Rails >= 5.1 and has a hard
             dependency on a webserver and `capybara`, please add capybara to
             your Gemfile and configure a webserver (e.g. `Capybara.server =