fix compatibility for ruby 3.2 and add tests

.github/workflows/test.yml

@@ -0,0 +1,69 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: RSpec and Cucumber
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ '2.5', '2.6', '2.7', '3.0', '3.1', jruby ]
+        gemfile: [ gemfiles/rails-6-1.gemfile ]
+        experimental: [ false ]
+        include:
+          - ruby: '3.0'
+            gemfile: gemfiles/rails-6-0.gemfile
+            experimental: false
+          - ruby: '3.0'
+            gemfile: gemfiles/rails-7-0.gemfile
+            experimental: false
+          - ruby: '3.2'
+            gemfile: gemfiles/rails-7-0.gemfile
+            experimental: false
+          - ruby: '3.2'
+            gemfile: gemfiles/rails-main.gemfile
+            experimental: true
+          - ruby: ruby-head
+            gemfile: gemfiles/rails-7-0.gemfile
+            experimental: false
+          - ruby: jruby-head
+            gemfile: gemfiles/rails-6-1.gemfile
+            experimental: true
+    runs-on: ubuntu-20.04
+    continue-on-error: ${{ matrix.experimental }}
+    env:
+      BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+      JRUBY_OPTS: --debug
+    steps:
+    - uses: actions/checkout@v3
+    - name: Setup ImageMagick policy
+      run: sudo sh -c 'echo '\''<policymap><policy domain="coder" rights="read|write" pattern="PDF" /></policymap>'\'' > /etc/ImageMagick-6/policy.xml'
+    - name: Update package list
+      run: sudo apt update
+    - name: Install ghostscript to process PDF
+      run: sudo apt-get -y install ghostscript
+    - name: Install libvips-dev for Carrierwave::Vips
+      run: sudo apt-get install libvips-dev
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+    - name: Run RSpec
+      run: bundle exec rake spec
+    - name: Run Cucumber
+      run: bundle exec rake features
+
+  rubocop:
+    name: RuboCop
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2"
+          bundler-cache: true
+      - name: Run check
+        run: bundle exec rubocop

lib/carrierwave/mount.rb

@@ -385,7 +385,7 @@ def blank?
       end
 
       def remove?
-        remove.present? && remove !~ /\A0|false$\z/
+        remove.present? && (remove.to_s !~ /\A0|false$\z/)
       end
 
       def remove!