Rails Rspec `require': cannot load such file -- rails_helper (LoadError)

For others who find this:

I got this error, 'require': cannot load such file -- rails_helper (LoadError), when I had included the rspec-rails gem but hadn't run rails generate rspec:install which generates the spec/rails_helper.rb file. So if the other solution doesn't help you, make sure you've done that.

For those that the answers above didn't help:

You just need to add gem 'rexml' to your Gemfile.rb, run bundle install and try again.

You are getting that error because you're trying to call your spec like this...

rspec mytest_spec.rb

You need to call it like this from your app's root folder , not inside the spec folder. So first get in the right folder

cd ~/
cd path_to_your_rails_app

Then call your spec

rspec spec/the_rest_of_the_path_to_your_spec/mytest_spec.rb

for instance

rspec spec/models/mytest_spec.rb