.travis.yml in honey_format-0.18.0 vs .travis.yml in honey_format-0.19.0

@@ -1,7 +1,28 @@
 language: ruby
-rvm:
-  - 2.3.0
-  - 2.4.0
-  - 2.5.0
-  - 2.6.0-preview1
-before_install: gem install bundler -v 1.16.1
+script:
+  - bundle exec rspec
+matrix:
+  fast_finish: true
+  allow_failures:
+  - name: TruffleRuby
+    rvm: system
+  include:
+  - rvm: 2.3.0
+    install:
+      - gem install bundler --no-ri --no-rdoc
+      - bundle install
+  - rvm: 2.5.1
+    install:
+      - gem install bundler --no-ri --no-rdoc
+      - bundle install
+  - rvm: 2.6.0-preview3
+    install:
+      - bundle install
+  - name: TruffleRuby
+    rvm: system
+    install:
+      - export TRUFFLERUBY_VERSION=1.0.0-rc3
+      - curl -L https://github.com/oracle/truffleruby/releases/download/vm-$TRUFFLERUBY_VERSION/truffleruby-$TRUFFLERUBY_VERSION-linux-amd64.tar.gz | tar xz
+      - export PATH="$PWD/truffleruby-$TRUFFLERUBY_VERSION-linux-amd64/bin:$PATH"
+      - gem install bundler -v 1.16.6 --no-ri --no-rdoc
+      - bundle install