Start support for testing with multiple different database adapters. (#…

…29)

Gemfile

@@ -12,3 +12,5 @@ gem "minitest-sprint"
 
 gem "activerecord"
 gem "sqlite3"
+gem "mysql2"
+gem "pg"

Gemfile.lock

@@ -22,7 +22,9 @@ GEM
     minitest (5.18.1)
     minitest-sprint (1.2.2)
       path_expander (~> 1.1)
+    mysql2 (0.5.5)
     path_expander (1.1.1)
+    pg (1.5.3)
     rake (13.0.6)
     sqlite3 (1.6.3-arm64-darwin)
     sqlite3 (1.6.3-x86_64-linux)
@@ -38,7 +40,9 @@ DEPENDENCIES
   activerecord
   minitest (~> 5.0)
   minitest-sprint
+  mysql2
   oaken!
+  pg
   rake (~> 13.0)
   sqlite3
 

test/test_helper.rb

@@ -6,7 +6,34 @@
 require "active_record"
 require "minitest/autorun"
 
-ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
+module Rails
+  def self.root() = __dir__ # Needed for the sqlite3 tasks.
+end
+
+ActiveRecord::Base.configurations = {
+  sqlite:   { adapter: "sqlite3",    pool: 5, database: "tmp/oaken_test.sqlite3" },
+  mysql:    { adapter: "mysql2",     pool: 5, encoding: "utf8mb4", database: "oaken_test", username: "root", host: "localhost" },
+  postgres: { adapter: "postgresql", pool: 5, encoding: "unicode", database: "oaken_test" }
+}
+
+adapter = :sqlite
+
+database = ActiveRecord::Base.configurations.resolve(adapter).then do |config|
+  case adapter
+  when :sqlite   then ActiveRecord::Tasks::SQLiteDatabaseTasks.new(config)
+  when :mysql    then ActiveRecord::Tasks::MySQLDatabaseTasks.new(config)
+  when :postgres then ActiveRecord::Tasks::PostgreSQLDatabaseTasks.new(config)
+  end
+end
+
+begin
+  database.create
+rescue ActiveRecord::DatabaseAlreadyExists
+end
+
+Minitest.after_run { database.drop }
+
+ActiveRecord::Base.establish_connection(adapter)
 ActiveRecord::Base.logger = Logger.new(STDOUT)
 
 ActiveRecord::Schema.define do