Test against Ruby 4.0 in CI

Author: nertzy

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["3.2", "3.3", "3.4"]
+        ruby-version: ["3.2", "3.3", "3.4", "4.0"]
         active-record-version-env:
           - ACTIVE_RECORD_VERSION="~> 7.1.0"
           - ACTIVE_RECORD_VERSION="~> 7.2.0"
@@ -47,19 +47,19 @@ jobs:
           - ruby-version: "ruby-head"
             active-record-version-env: ACTIVE_RECORD_VERSION="~> 8.1.0"
             allow-failure: true
-          - ruby-version: "3.4"
+          - ruby-version: "4.0"
             active-record-version-env: ACTIVE_RECORD_BRANCH="main"
             allow-failure: true
-          - ruby-version: "3.4"
+          - ruby-version: "4.0"
             active-record-version-env: ACTIVE_RECORD_BRANCH="8-1-stable"
             allow-failure: true
-          - ruby-version: "3.4"
+          - ruby-version: "4.0"
             active-record-version-env: ACTIVE_RECORD_BRANCH="8-0-stable"
             allow-failure: true
-          - ruby-version: "3.4"
+          - ruby-version: "4.0"
             active-record-version-env: ACTIVE_RECORD_BRANCH="7-2-stable"
             allow-failure: true
-          - ruby-version: "3.4"
+          - ruby-version: "4.0"
             active-record-version-env: ACTIVE_RECORD_BRANCH="7-1-stable"
             allow-failure: true
     continue-on-error: ${{ matrix.allow-failure }}

Gemfile

@@ -14,6 +14,7 @@ end
 
 gem "activerecord", ENV.fetch("ACTIVE_RECORD_VERSION", nil) if ENV["ACTIVE_RECORD_VERSION"] # standard:disable Bundler/DuplicatedGem
 
+gem "benchmark"
 gem "debug"
 gem "irb"
 gem "mutex_m"