Restore ruby 2.2 support

.travis.yml

@@ -17,6 +17,10 @@ matrix:
   allow_failures:
     - rvm: ruby-head
   include:
+    - rvm: 2.2
+      gemfile: gemfiles/rails_3.gemfile
+    - rvm: 2.2
+      gemfile: gemfiles/rails_4.gemfile
     - rvm: 2.3
       gemfile: gemfiles/rails_3.gemfile
     - rvm: 2.3

Appraisals

@@ -1,15 +1,20 @@
 appraise "rails-3" do
   gem "rails", "~> 3"
+  gem "sqlite3", "~> 1.3.6"
+  gem "test-unit", "~> 3.0"
 end
 
 appraise "rails-4" do
   gem "rails", "~> 4"
+  gem "sqlite3", "~> 1.3.6"
 end
 
 appraise "rails-5" do
   gem "rails", "~> 5"
+  gem "sqlite3"
 end
 
 appraise "rails-6" do
   gem "rails", "~> 6"
+  gem "sqlite3"
 end

README.md

@@ -198,17 +198,18 @@ worker.result_sets
 > This gem represents the state of art for rails version < 6 and it is still open to
 > further developments for more recent versions.
 
-The current CI prevents regressions on the folling versions:
+The current CI prevents regressions on the following versions:
 
 ruby / rails | `~>3` | `~>4` | `~>5` | `~>6`
 :-----------:|-------|-------|-------|------
+2.2          |  yes  |  yes  |  no   |  no
 2.3          |  yes  |  yes  |  yes  |  no
 2.4          |  no   |  yes  |  yes  |  no
 2.5          |  no   |  no   |  yes  |  yes
 2.6          |  no   |  no   |  yes  |  yes
 2.7          |  no   |  no   |  yes  |  yes
 
-> Any extending to the test suite to validate other db adapter than sqlite is welcome.
+> Any extension to the test suite to validate other db adapter than sqlite is welcome.
 
 ## License
 

bulk_insert.gemspec

@@ -14,10 +14,6 @@ Gem::Specification.new do |s|
   s.description = "Faster inserts! Insert N records in a single statement."
   s.license     = "MIT"
 
-  # ruby 2.2 reached EOL in 2018
-  # https://www.ruby-lang.org/en/news/2018/06/20/support-of-ruby-2-2-has-ended/
-  s.required_ruby_version = '>= 2.3.0'
-
   s.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
   s.test_files = Dir["test/**/*"]
 

gemfiles/rails_4.gemfile

@@ -2,8 +2,8 @@
 
 source "https://rubygems.org"
 
+gem "minitest"
 gem "rails", "~> 4"
-# https://github.com/rails/rails/blob/4-2-stable/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
 gem "sqlite3", "~> 1.3.6"
 
 gemspec path: "../"

gemfiles/rails_5.gemfile

@@ -2,6 +2,7 @@
 
 source "https://rubygems.org"
 
+gem "minitest"
 gem "rails", "~> 5"
 gem "sqlite3"
 

gemfiles/rails_6.gemfile

@@ -2,6 +2,7 @@
 
 source "https://rubygems.org"
 
+gem "minitest"
 gem "rails", "~> 6"
 gem "sqlite3"