Support Ruby 3

Author: fbacall

.github/workflows/tests.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ['2.6', '2.7']
+        ruby: ['2.6', '2.7', '3.0']
       fail-fast: false
     steps:
       - name: Checkout

.ruby-version

@@ -1 +1 @@
-ruby-2.7.5
+ruby-3.0.4

Gemfile.lock

@@ -14,9 +14,10 @@ GEM
       safe_yaml (~> 1.0.0)
     docile (1.3.5)
     hashdiff (1.0.1)
-    power_assert (1.1.3)
+    power_assert (2.0.1)
     public_suffix (4.0.6)
     rake (13.0.0)
+    rexml (3.2.5)
     rubyzip (2.0.0)
     safe_yaml (1.0.5)
     simplecov (0.21.2)
@@ -25,7 +26,7 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.2)
-    test-unit (3.2.9)
+    test-unit (3.5.3)
       power_assert
     webmock (3.8.3)
       addressable (>= 2.3.6)
@@ -38,9 +39,10 @@ PLATFORMS
 
 DEPENDENCIES
   rake (~> 13.0.0)
+  rexml (~> 3.2.5)
   ro-crate!
   simplecov (~> 0.21.2)
-  test-unit (~> 3.2.3)
+  test-unit (~> 3.5.3)
   webmock (~> 3.8.3)
   yard (~> 0.9.25)
 

lib/ro_crate/reader.rb

@@ -182,7 +182,7 @@ def self.initialize_crate(entity_hash, source, crate_class: ROCrate::Crate, cont
         crate.metadata.context = context
         preview_properties = entity_hash.delete(ROCrate::Preview::IDENTIFIER)
         preview_path = ::File.join(source, ROCrate::Preview::IDENTIFIER)
-        preview_path = ::File.exists?(preview_path) ? Pathname.new(preview_path) : nil
+        preview_path = ::File.exist?(preview_path) ? Pathname.new(preview_path) : nil
         if preview_properties || preview_path
           crate.preview = ROCrate::Preview.new(crate, preview_path, preview_properties || {})
         end

ro_crate.gemspec

@@ -11,8 +11,9 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'addressable', '>= 2.7', '< 2.9'
   s.add_runtime_dependency 'rubyzip', '~> 2.0.0'
   s.add_development_dependency 'rake', '~> 13.0.0'
-  s.add_development_dependency 'test-unit', '~> 3.2.3'
+  s.add_development_dependency 'test-unit', '~> 3.5.3'
   s.add_development_dependency 'simplecov', '~> 0.21.2'
   s.add_development_dependency 'yard', '~> 0.9.25'
   s.add_development_dependency 'webmock', '~> 3.8.3'
+  s.add_development_dependency 'rexml', '~> 3.2.5'
 end