add travis check rubies

.travis.yml

@@ -18,7 +18,8 @@ script:
   - RACK_ENV=test bundle exec rake spec
   - bundle exec rake bundle:audit
   - bundle exec rubocop 
-  - cp Gemfile.lock.org Gemfile.lock
+  - bundle exec travis_check_rubies
+  - cp -p Gemfile.lock.org Gemfile.lock
 
 addons:
   postgresql: "9.6"

Gemfile

@@ -31,6 +31,7 @@ group :test do
   gem 'simplecov', '~> 0.15.1', require: false # for code coverage
   gem 'timecop', require: false # testing time dependent
   gem 'travis', '~> 1.8.8', require: false # for continuous integrations
+  gem 'travis_check_rubies',  require: false # check ruby versions on Travis
 end
 
 group :development do

Gemfile.lock

@@ -53,6 +53,7 @@ GEM
     ffi (1.9.23)
     ffi (1.9.23-x64-mingw32)
     formatador (0.2.5)
+    fspath (3.1.0)
     gh (0.15.1)
       addressable (~> 2.4.0)
       backports
@@ -204,6 +205,8 @@ GEM
       launchy (~> 2.1)
       pusher-client (~> 0.4)
       typhoeus (~> 0.6, >= 0.6.8)
+    travis_check_rubies (0.2.5)
+      fspath (~> 3.0)
     typhoeus (0.8.0)
       ethon (>= 0.8.0)
     tzinfo (1.2.5)
@@ -256,6 +259,7 @@ DEPENDENCIES
   sinatra-activerecord (~> 2.0.13)
   timecop
   travis (~> 1.8.8)
+  travis_check_rubies
   validates_email_format_of (~> 1.6.3)
   wdm (>= 0.1.0)
 

bin/travis_check_rubies

@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'travis_check_rubies' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("../bundle", __FILE__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 150) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("travis_check_rubies", "travis_check_rubies")

spec/study_participant_spec.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 RSpec.describe StudyParticipant, type: :model do
-  subject { described_class.find_or_create_by participant: participant, study: study }
+  subject { TestFactory.test_study_participant }
   let!(:study) { TestFactory.test_study }
   let!(:participant) { TestFactory.test_participant }