ci.yml in diffend-0.2.37

- old
+ new

@@ -6,14 +6,18 @@
 
     strategy:
       fail-fast: false
       matrix:
         ruby:
+          - '3.0'
           - '2.7'
           - '2.6'
           - '2.5'
-          - 'jruby'
+          - 'jruby-9.2.13.0'
+        bundler:
+          - '2.1.4'
+          - '2.2.4'
         include:
           - ruby: '2.7'
             coverage: 'true'
 
     steps:
@@ -28,22 +32,20 @@
         run: "[ -e $APT_DEPS ] || sudo apt-get install -y --no-install-recommends $APT_DEPS"
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{matrix.ruby}}
-      - name: Install latest bundler
-        run: |
-          gem install bundler --no-document
+          bundler: ${{matrix.bundler}}
       - name: Bundle install
         env:
           DIFFEND_DEVELOPMENT: true
         run: |
-          bundle config path vendor/bundle
-          bundle install --jobs 4 --retry 3
+          bundle _${{matrix.bundler}}_ config path vendor/bundle
+          bundle _${{matrix.bundler}}_ install --jobs 4 --retry 3
       - name: Run all tests
         env:
           GITHUB_COVERAGE: ${{matrix.coverage}}
-        run: bundle exec rspec
+        run: bundle _${{matrix.bundler}}_ exec rspec
 
   coditsu:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false