```ruby
# This file was generated by the `rspec --init` command. Conventionally, all
# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
# Require this file using `require "spec_helper.rb"` to ensure that it is only
# loaded once.
#
# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration

require 'rubygems'
require 'bundler/setup'

if ENV['COVERAGE']
  require 'simplecov'
  require 'simplecov-rcov'
  SimpleCov.formatter = SimpleCov::Formatter::RcovFormatter
  SimpleCov.start
end

require 'rails_core_extensions'

RSpec.configure do |config|
  config.treat_symbols_as_metadata_keys_with_true_values = true
  config.run_all_when_everything_filtered = true
  config.filter_run :focus
end
```

Use absolute syntax on filters to avoid matching parent directories: e.g. /home/spec/rails_core_extensions/lib accidently matches spec when only intending to match spec within rails_core_extensions directory
user
```ruby
# This file was generated by the `rspec --init` command. Conventionally, all
# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
# Require this file using `require "spec_helper.rb"` to ensure that it is only
# loaded once.
#
# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration

require 'rubygems'
require 'bundler/setup'

if ENV['COVERAGE']
  require 'simplecov'
  require 'simplecov-rcov'
  SimpleCov.formatter = SimpleCov::Formatter::RcovFormatter
  SimpleCov.start do
    add_filter '/vendor/'
    add_filter '/spec/'
    add_group 'lib', 'lib'
  end
end

require 'rails_core_extensions'

RSpec.configure do |config|
  config.treat_symbols_as_metadata_keys_with_true_values = true
  config.run_all_when_everything_filtered = true
  config.filter_run :focus
end
```
assistant