RubyMine supports RSpec up to version 2.8.0. This section describes how to use RSpec in plain Ruby projects, and in Rails applications:
For RSpec 2.x, special configuration is required for the coverage options. The Rake task that launches RSpec 2.x tests with the code coverage enabled, need RCOV_OPTS environment variable, and should be modified as shown below:
# rspec 2.x
require "rake"
require "rspec/core/rake_task"
desc "Run all specs with rcov"
RSpec::Core::RakeTask.new("test_cov") do |t|
t.rcov = true
t.rcov_opts = ENV["RCOV_OPTS"]
end