Run CircleCI tests with many Rubies (presidentbeef#1336)

Move all testing to CircleCI, remove TravisCI

.circleci/config.yml

@@ -1,22 +1,80 @@
-version: 2
+version: 2.1
 jobs:
-  build:
-    branches:
-      ignore:
-        - gh-pages
+  default: &default
     docker:
-      - image: circleci/ruby:2.5.1-stretch-node-browsers
-        environment:
-          BUNDLE_JOBS: 4
-          BUNDLE_RETRY: 3
-          BUNDLE_PATH: vendor/bundle
-    parallelism: 4
+      - image: circleci/ruby:latest
     steps:
       - checkout
       - run: bundle check || bundle install
+      - run:
+          command: bundle exec rake
+      - store_test_results:
+          path: test-results
+  test-2-3:
+    <<: *default
+    docker:
+      - image: circleci/ruby:2.3
+    steps:
+      - checkout
+      - attach_workspace:
+          at: ~/repo/tmp
+      - run:
+          name:  Download cc-test-reporter
+          command: |
+            mkdir -p tmp/
+            curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./tmp/cc-test-reporter
+            chmod +x ./tmp/cc-test-reporter
+      - run: bundle check || bundle install
       - run:
           command: |
-            TESTFILES=$(circleci tests glob "test/tests/*.rb" | circleci tests split --split-by=timings)
-            bundle exec ruby -e 'ARGV.each {|f| require File.join(".", f) }' -- $TESTFILES
+            bundle exec rake
+            ./tmp/cc-test-reporter format-coverage -t simplecov -o tmp/codeclimate.json coverage/.resultset.json
       - store_test_results:
           path: test-results
+      - persist_to_workspace:
+          root: tmp
+          paths:
+            - codeclimate.json
+            - cc-test-reporter
+  test-2-4:
+    <<: *default
+    docker:
+      - image: circleci/ruby:2.4
+  test-2-5:
+    <<: *default
+    docker:
+      - image: circleci/ruby:2.5
+  test-2-6:
+    <<: *default
+    docker:
+      - image: circleci/ruby:2.6
+  test-latest:
+    <<: *default
+    docker:
+      - image: circleci/ruby:latest
+  test-jruby:
+    <<: *default
+    docker:
+      - image: circleci/jruby:latest
+  upload-coverage:
+    <<: *default
+    working_directory: ~/repo
+    steps:
+      - attach_workspace:
+          at: ~/repo/tmp
+      - run:
+          name: Upload coverage results to Code Climate
+          command: "./tmp/cc-test-reporter upload-coverage -i ./tmp/codeclimate.json"
+workflows:
+  version: 2
+  tests:
+    jobs:
+      - default
+      - test-2-3
+      - test-2-4
+      - test-2-5
+      - test-2-6
+      - test-jruby
+      - upload-coverage:
+          requires:
+            - test-2-3

Gemfile

@@ -3,7 +3,5 @@ source "https://rubygems.org"
 gemspec :name => "brakeman"
 
 unless ENV['BM_PACKAGE']
-  gem "rake", "< 10.2.0"
-  gem "codeclimate-test-reporter", group: :test, require: nil
-  gem "json", "< 2.0", group: :test, require: nil # For Ruby 1.9.3 https://github.com/colszowka/simplecov/issues/511
+  gem "rake"
 end

gem_common.rb

@@ -3,6 +3,7 @@ module GemDependencies
     def self.dev_dependencies spec
       spec.add_development_dependency "minitest"
       spec.add_development_dependency "minitest-ci"
+      spec.add_development_dependency "simplecov"
     end
 
     def self.base_dependencies spec