diff --git a/.travis.yml b/.travis.yml
index 92b868b7d..2a7f37ecd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -43,6 +43,18 @@ jobs:
       gemfile: gemfiles/rails_6.0.gemfile
     - rvm: 2.4.10
       gemfile: gemfiles/rails_edge.gemfile
+    - rvm: 2.7.1
+      gemfile: gemfiles/rails_5.0.gemfile
+    - rvm: 2.7.1
+      gemfile: gemfiles/rails_5.1.gemfile
+    - rvm: 2.7.1
+      gemfile: gemfiles/rails_5.2.gemfile
+    - rvm: ruby-head
+      gemfile: gemfiles/rails_5.0.gemfile
+    - rvm: ruby-head
+      gemfile: gemfiles/rails_5.1.gemfile
+    - rvm: ruby-head
+      gemfile: gemfiles/rails_5.2.gemfile
   fast_finish: true
 
 script: bundle exec rake test:all
diff --git a/lib/client_side_validations/action_view/form_helper.rb b/lib/client_side_validations/action_view/form_helper.rb
index 6fb1ae377..5c2eb10fb 100644
--- a/lib/client_side_validations/action_view/form_helper.rb
+++ b/lib/client_side_validations/action_view/form_helper.rb
@@ -98,10 +98,10 @@ def construct_validators
         def add_validator(validator_hash, validation_hash, name, attr)
           if validation_hash.key?(attr)
             validator_hash[name] = validation_hash[attr]
-          elsif attr.to_s.ends_with?('_id')
+          elsif attr.to_s.end_with?('_id')
             association_name = attr.to_s.gsub(/_id\Z/, '').to_sym
             add_validator_with_association validator_hash, validation_hash, name, association_name
-          elsif attr.to_s.ends_with?('_ids')
+          elsif attr.to_s.end_with?('_ids')
             association_name = attr.to_s.gsub(/_ids\Z/, '').pluralize.to_sym
             add_validator_with_association validator_hash, validation_hash, name, association_name
           end
diff --git a/lib/client_side_validations/active_model.rb b/lib/client_side_validations/active_model.rb
index d77338fc6..3cbf54320 100644
--- a/lib/client_side_validations/active_model.rb
+++ b/lib/client_side_validations/active_model.rb
@@ -91,7 +91,7 @@ def check_new_record(validator)
       end
 
       def will_save_change?(options)
-        options.is_a?(Symbol) && (options.to_s.ends_with?('changed?') || options.to_s.starts_with?('will_save_change_to'))
+        options.is_a?(Symbol) && (options.to_s.end_with?('changed?') || options.to_s.start_with?('will_save_change_to'))
       end
 
       def check_conditionals(attr, validator, force)