Make migration specs by using migrator in around hook

spec/migrations/migrate_pipeline_stages_spec.rb

@@ -2,10 +2,23 @@ require 'spec_helper'
 require Rails.root.join('db', 'migrate', '20170525132202_migrate_pipeline_stages.rb')
 
 describe MigratePipelineStages, :migration, schema: 20170523091700 do
+  ##
+  # TODO, extract to migrations helper
+  #
   def table(name)
     Class.new(ActiveRecord::Base) { self.table_name = name }
   end
 
+  def migrations_paths
+    ActiveRecord::Migrator.migrations_paths
+  end
+
+  def migrate!
+    ActiveRecord::Migrator.up(migrations_paths) do |migration|
+      migration.name == described_class.name
+    end
+  end
+
   ##
   # Create test data
   #
@@ -13,10 +26,10 @@ describe MigratePipelineStages, :migration, schema: 20170523091700 do
     table(:ci_pipelines).create!(ref: 'master', sha: 'adf43c3a')
   end
 
-  it 'correctly migrates pipeline stages' do
+  it 'correctly migrates pipeline stages' do |migration, meta|
     expect(ActiveRecord::Base.connection.table_exists?('ci_stages')).to eq false
 
-    described_class.new.migrate(:up)
+    migrate!
 
     expect(ActiveRecord::Base.connection.table_exists?('ci_stages')).to eq true
   end

spec/spec_helper.rb

@@ -100,7 +100,7 @@ RSpec.configure do |config|
 
     example.run
 
-    ActiveRecord::Migration.maintain_test_schema!
+    ActiveRecord::Migrator.migrate(migrations_paths)
   end
 end