Stub Env

This project provides a simple helper method to stub ENV values within RSpec tests.

To start using it, install the gem in your project in the test group.

  gem 'stub_env'

Then add the following to your rails_config.rb

RSpec.configure do |config|
  config.include StubEnv::Helpers
end

There are 2 possible usages. The first is to stub a single value:

  stub_env('key', 'value')

  puts ENV['key'] # => "value"
  puts ENV.fetch('key') # => "value"

These will work in series, so you can stub multiple values by making multiple calls:

  stub_env('key1', 'value1')
  stub_env('key2', 'value2')

  puts ENV['key1'] # => "value1"
  puts ENV['key2'] # => "value2"
  puts ENV.fetch('key1') # => "value1"
  puts ENV.fetch('key2') # => "value2"

The second method is to stub multiple values using a hash:

  stub_env({'key' => 'value', 'key2' => 'value2'})

  puts ENV['key1'] # => "value1"
  puts ENV['key2'] # => "value2"
  puts ENV.fetch('key1') # => "value1"
  puts ENV.fetch('key2') # => "value2"

You can also use this multiple times, and in combination with the other method:

  stub_env({'key1' => 'value1', 'key2' => 'value2'})
  stub_env('key3', 'value3')
  stub_env({'key4' => 'value4'})

  puts ENV['key1'] # => "value1"
  puts ENV['key2'] # => "value2"
  puts ENV['key3'] # => "value3"
  puts ENV['key4'] # => "value4"
  puts ENV.fetch('key1') # => "value1"
  puts ENV.fetch('key2') # => "value2"
  puts ENV.fetch('key3') # => "value3"
  puts ENV.fetch('key4') # => "value4"

All ENV values not stubbed will return their original values.

  # Given ENV['unstubbed_key'] = 'unstubbed_value'
  stub_env('key', 'value')

  puts ENV['key'] # => "value"
  puts ENV['unstubbed_key'] # => "unstubbed_value"
  puts ENV.fetch('key') # => "value"
  puts ENV.fetch('unstubbed_key') # => "unstubbed_value"