delay running safeguards until right before cleaning begins. this allows for time to configure safeguards.

lib/database_cleaner/cleaner.rb

@@ -1,5 +1,4 @@
 require 'database_cleaner/null_strategy'
-require 'database_cleaner/safeguard'
 require 'database_cleaner/strategy'
 require 'forwardable'
 
@@ -28,7 +27,6 @@ module DatabaseCleaner
     def initialize(orm, db: nil)
       @orm = orm
       self.db = db
-      Safeguard.new.run
     end
 
     attr_reader :orm

lib/database_cleaner/cleaners.rb

@@ -1,4 +1,5 @@
 require 'database_cleaner/cleaner'
+require 'database_cleaner/safeguard'
 
 module DatabaseCleaner
   class Cleaners < Hash
@@ -18,20 +19,24 @@ module DatabaseCleaner
     end
 
     def start
+      Safeguard.new.run
       values.each { |cleaner| cleaner.start }
     end
 
     def clean
+      Safeguard.new.run
       values.each { |cleaner| cleaner.clean }
     end
 
     def cleaning(&inner_block)
+      Safeguard.new.run
       values.inject(inner_block) do |curr_block, cleaner|
         proc { cleaner.cleaning(&curr_block) }
       end.call
     end
 
     def clean_with(*args)
+      Safeguard.new.run
       values.each { |cleaner| cleaner.clean_with(*args) }
     end
 

spec/database_cleaner/safeguard_spec.rb

@@ -1,6 +1,6 @@
 module DatabaseCleaner
   RSpec.describe Safeguard do
-    let(:cleaner)  { Cleaner.new(:null) }
+    let(:cleaner)  { Cleaners.new }
 
     describe 'DATABASE_URL is set' do
       before { stub_const('ENV', 'DATABASE_URL' => database_url) }