How to exclude tests from running them?

For instance you would like to run all tests except tests in features directory then you could do:

KNAPSACK_PRO_TEST_FILE_EXCLUDE_PATTERN="spec/features/**{,/*/**}/*_spec.rb" \
bundle exec rake knapsack_pro:queue:rspec

You can define at the same time the pattern for tests you would like to run and the exclude pattern. For instance run all controller tests except admin controller tests.

KNAPSACK_PRO_TEST_FILE_PATTERN="spec/controllers/**{,/*/**}/*_spec.rb" \
KNAPSACK_PRO_TEST_FILE_EXCLUDE_PATTERN="spec/controllers/admin/**{,/*/**}/*_spec.rb" \
bundle exec rake knapsack_pro:queue:rspec

The test file pattern and exclude pattern support any glob pattern handled by Dir.glob.