Add database_cleaner gem

spec/support/database_cleaner.rb

@@ -0,0 +1,22 @@
+RSpec.configure do |config|
+  config.before(:suite) do
+    DatabaseCleaner.clean_with(:truncation)
+  end
+
+  config.before(:each) do
+    DatabaseCleaner.strategy = :transaction
+  end
+
+  config.before(:each, type: :feature) do
+    DatabaseCleaner.strategy = :truncation
+  end
+
+  config.before(:each) do
+    DatabaseCleaner.start
+  end
+
+  config.append_after(:each) do
+    DatabaseCleaner.clean
+  end
+
+end