Matrix test redis version (#1814)

* Matrix test redis version

* Earlier redis version

* Some exclusions, more modern redis server

* Revert "Some exclusions, more modern redis server"

This reverts commit 93af940.

* Adding supported redis versions

* Apply suggestions from code review

Co-authored-by: nicholas a. evans <nicholas.evans@gmail.com>

Co-authored-by: nicholas a. evans <nicholas.evans@gmail.com>

.github/workflows/ci.yml

@@ -12,6 +12,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        redis-version:
+          - 4.0
+          - 4.1
+          - 4.2
+          - 4.3
+          - 4.4
+          - 4.5
+          - 4.6
+          - latest
         ruby-version:
           - 2.3
           - 2.4
@@ -21,6 +30,13 @@ jobs:
           - "3.0"
           - 3.1
           - head
+        exclude:
+          - { ruby-version: 2.3, redis-version: 4.5 }
+          - { ruby-version: 2.3, redis-version: 4.6 }
+          - { ruby-version: 2.3, redis-version: latest }
+    env:
+      REDIS_VERSION: "${{ matrix.redis-version }}"
+
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1

Gemfile

@@ -1,9 +1,14 @@
 source "https://rubygems.org"
-
 gemspec
 
-gem "json"
+case redis_version = ENV.fetch('REDIS_VERSION', 'latest')
+when 'latest'
+  gem 'redis', '~> 4.7'
+else
+  gem 'redis', "~> #{redis_version}.0"
+end
 
+gem "json"
 gem "minitest", "~> 5.11"
 gem "mocha", "~> 1.11", require: false
 gem "rack-test", "~> 2.0"