CI: Fix failing tests and warnings

* Fix warnings when running bin/rails test:all
* Fix image-alt rule violation text in tests
* Change image-alt rule violation text:

  ```diff
  -"image-alt: Images must have alternate text"
  +"image-alt: Images must have alternative text"
  ```
* Expand CI matrix to account for new Rails versions

.github/workflows/ci.yml

@@ -13,12 +13,24 @@ jobs:
           - "3.1"
           - "3.2"
         rails-version:
+          - "8.0"
+          - "7.2"
           - "7.1"
           - "7.0"
           - "6.1"
           - "main"
         exclude:
           - ruby-version: "3.0"
+            rails-version: "7.2"
+          - ruby-version: "3.0"
+            rails-version: "8.0"
+          - ruby-version: "3.0"
+            rails-version: "main"
+          - ruby-version: "3.1"
+            rails-version: "7.2"
+          - ruby-version: "3.1"
+            rails-version: "8.0"
+          - ruby-version: "3.1"
             rails-version: "main"
 
     env:

capybara_accessibility_audit.gemspec

@@ -23,4 +23,8 @@ Gem::Specification.new do |spec|
   spec.add_dependency "capybara"
   spec.add_dependency "axe-core-api"
   spec.add_dependency "zeitwerk"
+
+  spec.add_dependency "bigdecimal"
+  spec.add_dependency "drb"
+  spec.add_dependency "mutex_m"
 end

spec/system/audit_assertions_spec.rb

@@ -51,7 +51,7 @@
 
   it "raises violations within a skip_accessibility_violation block that does not apply" do
     skip_accessibility_violations "label" do
-      assert_rule_violation "image-alt: Images must have alternate text" do
+      assert_rule_violation "image-alt: Images must have alternative text" do
         visit violations_path(rules: %w[image-alt])
       end
     end
@@ -93,7 +93,7 @@
       go_back
 
       with_accessibility_audits do
-        assert_rule_violation "image-alt: Images must have alternate text" do
+        assert_rule_violation "image-alt: Images must have alternative text" do
           click_on "Violate rule: image-alt"
         end
       end
@@ -104,7 +104,7 @@
 
       assert_rule_violation(
         with: "label: Form elements must have labels",
-        without: "image-alt: Images must have alternate text"
+        without: "image-alt: Images must have alternative text"
       ) do
         assert_no_accessibility_violations checking: "label", skipping: "image-alt"
       end

test/system/audit_assertions_test.rb

@@ -53,7 +53,7 @@ class AuditAssertionsTest < ApplicationSystemTestCase
 
   test "raises violations within a skip_accessibility_violation block that does not apply" do
     skip_accessibility_violations "label" do
-      assert_rule_violation "image-alt: Images must have alternate text" do
+      assert_rule_violation "image-alt: Images must have alternative text" do
         visit violations_path(rules: %w[image-alt])
       end
     end
@@ -108,7 +108,7 @@ class DisablingAuditAssertionsTest < ApplicationSystemTestCase
     go_back
 
     with_accessibility_audits do
-      assert_rule_violation "image-alt: Images must have alternate text" do
+      assert_rule_violation "image-alt: Images must have alternative text" do
         click_on "Violate rule: image-alt"
       end
     end
@@ -119,7 +119,7 @@ class DisablingAuditAssertionsTest < ApplicationSystemTestCase
 
     assert_rule_violation(
       with: "label: Form elements must have labels",
-      without: "image-alt: Images must have alternate text"
+      without: "image-alt: Images must have alternative text"
     ) do
       assert_no_accessibility_violations checking: "label", skipping: "image-alt"
     end