How can I run tests from multiple directories?

The test file pattern KNAPSACK_PRO_TEST_FILE_PATTERN environment variable supports any glob pattern handled by Dir.glob and can be configured to pull test files from multiple directories. An example of this when using RSpec would be "{spec,engines/*/spec}/**/*_spec.rb". For complex cases like this, the default test directory (where RSpec is looking for your spec_helper.rb file) can't be automatically extracted and must be specified manually using the KNAPSACK_PRO_TEST_DIR environment variable:

# This is example where you have in engines directory multiple projects
# and each project directory has a spec folder and you would like to run tests for it.
# You want to use the spec_helper from the main spec directory.
#
# Tree:
# * spec
# * engines
#   * project_a
#     * spec
#   * project_b
#     * spec
$ KNAPSACK_PRO_TEST_DIR=spec KNAPSACK_PRO_TEST_FILE_PATTERN="{spec,engines/*/spec}/**/*_spec.rb" bundle exec rake knapsack_pro:queue:rspec

KNAPSACK_PRO_TEST_DIR will be your default path for rspec so you should put there your spec_helper.rb. Please ensure you will require it in your test files this way if something doesn't work:

# good
require_relative 'spec_helper'

# bad - won't work
require 'spec_helper'