CODEWITHSUNDEEP
rubyrspecmodule
Niko Efimov
Niko Efimov

Reputation: 2213

How to reload modules between RSpec tests with Ruby?

I have a module that can be configured like so:

module MyModule
   mattr_accessor :setting
   @@setting = :some_default_value
end

MyModule.setting = :custom_value

I'm testing different configuration options with RSpec, and found that the settings persist between different tests because they are class variables.

What's the best way to reload and re-initialize the module in between RSpec tests?

Upvotes: 11

Views: 6395

Answers (2)

sequielo
sequielo

Reputation: 1631

I came to this solution:

describe MyModule do

  before :each do
    # Removes the MyModule from object-space (the condition might not be needed):
    Object.send(:remove_const, :MyModule) if Module.const_defined?(:MyModule)

    # Reloads the module (require might also work):
    load 'path/to/my_module.rb'
  end

  it "should have X value" do
     MyModule.setting = :X

     expect(MyModule.setting).to eq :X
  end

end

Source: http://geminstallthat.wordpress.com/2008/08/11/reloading-classes-in-rspec/

Upvotes: 5

Erez Rabih
Erez Rabih

Reputation: 15788

1: Did you try requiring the file in a before :each block?

require 'my_module'

2: I don't know if reloading a file is the right thing to do here. From what it seems all you want is some class's values to become default again, for that I'd just create a method that changes the module's values to whatever I wish.

describe MyModule do

  def module_to_default
    MyModule.setting = :some_default_value
  end

  before :each do
    module_to_default
  end
end

If you see a good use for defaulting this module values in your code it may even be a good idea to move the method into the module itself.

Upvotes: 0

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