```ruby

ENV["RAILS_ENV"] = "test"
require File.expand_path('../../config/environment', __FILE__)

if ENV["TEST_COVERAGE"]
  require 'simplecov'
  require 'simplecov-rcov'

  SimpleCov.formatter = SimpleCov::Formatter::RcovFormatter
  SimpleCov.start 'rails'
end

FLOW_REGISTRY_OPTIONS[:preload_flows] = true

require 'rails/test_help'

require 'mocha/setup'

require 'webmock/minitest'
WebMock.disable_net_connect!(allow_localhost: true, net_http_connect_on_start: true)

class Minitest::Test
  def teardown_with_customisations
    teardown_without_customisations
    Timecop.return
    WorldLocation.reset_cache
  end
  alias_method_chain :teardown, :customisations
end

require 'gds_api/test_helpers/json_client_helper'
require_relative 'support/fixture_methods'

class ActiveSupport::TestCase
  include FixtureMethods
end
```

Configure Mocha to prevent stubbing of non-existent methods
user
```ruby

ENV["RAILS_ENV"] = "test"
require File.expand_path('../../config/environment', __FILE__)

if ENV["TEST_COVERAGE"]
  require 'simplecov'
  require 'simplecov-rcov'

  SimpleCov.formatter = SimpleCov::Formatter::RcovFormatter
  SimpleCov.start 'rails'
end

FLOW_REGISTRY_OPTIONS[:preload_flows] = true

require 'rails/test_help'

require 'mocha/setup'
Mocha::Configuration.prevent(:stubbing_non_existent_method)

require 'webmock/minitest'
WebMock.disable_net_connect!(allow_localhost: true, net_http_connect_on_start: true)

class Minitest::Test
  def teardown_with_customisations
    teardown_without_customisations
    Timecop.return
    WorldLocation.reset_cache
  end
  alias_method_chain :teardown, :customisations
end

require 'gds_api/test_helpers/json_client_helper'
require_relative 'support/fixture_methods'

class ActiveSupport::TestCase
  include FixtureMethods
end
```
assistant