.travis.yml in smart_initializer-0.1.0.alpha4 vs .travis.yml in smart_initializer-0.1.0

@@ -1,20 +1,51 @@
 ---
 language: ruby
 cache: bundler
 os: linux
-before_install: gem install bundler -v 2.1.2
+dist: xenial
+before_install: gem install bundler
 script:
 - bundle exec rake rubocop
 - bundle exec rake rspec
 jobs:
   fast_finish: true
   include:
-  - rvm: 2.4.9
-  - rvm: 2.5.7
-  - rvm: 2.6.5
-  - rvm: 2.7.0
+  - rvm: 2.4.10
+    gemfile: gemfiles/with_external_deps.gemfile
+    env: TEST_PLUGINS=true FULL_TEST_COVERAGE_CHECK=true
+  - rvm: 2.5.8
+    gemfile: gemfiles/with_external_deps.gemfile
+    env: TEST_PLUGINS=true FULL_TEST_COVERAGE_CHECK=true
+  - rvm: 2.6.6
+    gemfile: gemfiles/with_external_deps.gemfile
+    env: TEST_PLUGINS=true FULL_TEST_COVERAGE_CHECK=true
+  - rvm: 2.7.1
+    gemfile: gemfiles/with_external_deps.gemfile
+    env: TEST_PLUGINS=true FULL_TEST_COVERAGE_CHECK=true
   - rvm: ruby-head
+    gemfile: gemfiles/with_external_deps.gemfile
+    env: TEST_PLUGINS=true FULL_TEST_COVERAGE_CHECK=true
   - rvm: jruby-head
+    gemfile: gemfiles/with_external_deps.gemfile
+    env: TEST_PLUGINS=true FULL_TEST_COVERAGE_CHECK=true
+  - rvm: truffleruby
+    gemfile: gemfiles/with_external_deps.gemfile
+    env: TEST_PLUGINS=true FULL_TEST_COVERAGE_CHECK=true
+  - rvm: 2.4.10
+    gemfile: gemfiles/without_external_deps.gemfile
+  - rvm: 2.5.8
+    gemfile: gemfiles/without_external_deps.gemfile
+  - rvm: 2.6.6
+    gemfile: gemfiles/without_external_deps.gemfile
+  - rvm: 2.7.1
+    gemfile: gemfiles/without_external_deps.gemfile
+  - rvm: ruby-head
+    gemfile: gemfiles/without_external_deps.gemfile
+  - rvm: jruby-head
+    gemfile: gemfiles/without_external_deps.gemfile
+  - rvm: truffleruby
+    gemfile: gemfiles/without_external_deps.gemfile
   allow_failures:
   - rvm: ruby-head
   - rvm: jruby-head
+  - rvm: truffleruby