The test PuppetclassLookupKeyJSTest.test_0002_uncheck override has been failing intermittently at these locations:

PuppetclassLookupKeyJSTest.test_0002_uncheck override
Took 3.9 sec.
Failed assertion, no message given. (Minitest::Assertion)
/var/lib/workspace/workspace/test_develop_pr_core/database/postgresql/label/fast/ruby/2.1/test/integration/puppetclass_lookup_key_js_test.rb:37

(at commit 29ff66614d2fefab3dcac452b5a2c46d3d3ffa5b)

PuppetclassLookupKeyJSTest.test_0002_uncheck override
Took 32 sec.
Capybara::ElementNotFound: Unable to find css "#puppetclass_lookup_key_hidden_value" 
    test/integration/puppetclass_lookup_key_js_test.rb:19:in `block in <class:PuppetclassLookupKeyJSTest>' (Capybara::ElementNotFound)
/usr/local/rvm/gems/ruby-2.1.5@test_develop-0/gems/capybara-2.7.1/lib/capybara/node/finders.rb:44    

(at commit d9cc252b6845e38bf721ea68503aa2a677c44575)

Also a related test:

PuppetclassLookupKeyJSTest.test_0001_can hide value when overriden
Took 32 sec.
Capybara::ElementNotFound: Unable to find css "#puppetclass_lookup_key_hidden_value:enabled" 
    test/integration/puppetclass_lookup_key_js_test.rb:10:in `block in <class:PuppetclassLookupKeyJSTest>' (Capybara::ElementNotFound)
/usr/local/rvm/gems/ruby-2.0.0-p353@test_develop-0/gems/capybara-2.7.1/lib/capybara/node/finders.rb:44    

(at commit d9cc252b6845e38bf721ea68503aa2a677c44575)