class ActiveSupport::TestCase

Returns the ActiveRecord::FixtureSet collection.

In your test_helper.rb you must have require "rails/test_help".

# File activesupport/lib/active_support/test_case.rb, line 170
      

Sets the given path to the fixture set.

Can also append multiple paths.

ActiveSupport::TestCase.fixture_paths << "component1/test/fixtures"

In your test_helper.rb you must have require "rails/test_help".

# File activesupport/lib/active_support/test_case.rb, line 176
    

Returns the current parallel worker ID if tests are running in parallel, nil otherwise.

ActiveSupport::TestCase.parallel_worker_id # => 2

# File activesupport/lib/active_support/test_case.rb, line 34
def parallel_worker_id
  @@parallel_worker_id
end

Parallelizes the test suite.

Takes a workers argument that controls how many times the process is forked. For each process a new database will be created suffixed with the worker number.

test-database_0
test-database_1

If ENV["PARALLEL_WORKERS"] is set the workers argument will be ignored and the environment variable will be used instead. This is useful for CI environments, or other environments where you may need more workers than you do for local testing.

If the number of workers is set to 1 or fewer, the tests will not be parallelized.

If workers is set to :number_of_processors, the number of workers will be set to the actual core count on the machine you are on.

The default parallelization method is to fork processes. If you’d like to use threads instead you can pass with: :threads to the parallelize method. Note the threaded parallelization does not create multiple databases and will not work with system tests.

parallelize(workers: :number_of_processors, with: :threads)

The threaded parallelization uses minitest’s parallel executor directly. The processes parallelization uses a Ruby DRb server.

Because parallelization presents an overhead, it is only enabled when the number of tests to run is above the threshold param. The default value is 50, and it’s configurable via config.active_support.test_parallelization_threshold.

If you want to skip Rails default creation of one database per process in favor of writing your own implementation, you can set parallelize_databases, or configure it via config.active_support.parallelize_test_databases.

parallelize(workers: :number_of_processors, parallelize_databases: false)

Note that your test suite may deadlock if you attempt to use only one database with multiple processes.

# File activesupport/lib/active_support/test_case.rb, line 107
def parallelize(workers: :number_of_processors, with: :processes, threshold: ActiveSupport.test_parallelization_threshold, parallelize_databases: ActiveSupport.parallelize_test_databases)
  case
  when ENV["PARALLEL_WORKERS"]
    workers = ENV["PARALLEL_WORKERS"].to_i
  when workers == :number_of_processors
    workers = (Concurrent.available_processor_count || Concurrent.processor_count).floor
  end

  if with == :processes
    ActiveSupport.parallelize_test_databases = parallelize_databases
  end

  Minitest.parallel_executor = ActiveSupport::Testing::ParallelizeExecutor.new(size: workers, with: with, threshold: threshold)
end

Before fork hook for parallel testing. This can be used to run anything before the processes are forked.

In your test_helper.rb add the following:

class ActiveSupport::TestCase
  parallelize_before_fork do
    # run this before fork
  end
end

# File activesupport/lib/active_support/test_case.rb, line 132
def parallelize_before_fork(&block)
  ActiveSupport::Testing::Parallelization.before_fork_hook(&block)
end

Setup hook for parallel testing. This can be used if you have multiple databases or any behavior that needs to be run after the process is forked but before the tests run.

Note: this feature is not available with the threaded parallelization.

In your test_helper.rb add the following:

class ActiveSupport::TestCase
  parallelize_setup do
    # create databases
  end
end

# File activesupport/lib/active_support/test_case.rb, line 149
def parallelize_setup(&block)
  ActiveSupport::Testing::Parallelization.after_fork_hook(&block)
end

Clean up hook for parallel testing. This can be used to drop databases if your app uses multiple write/read databases or other clean up before the tests finish. This runs before the forked process is closed.

Note: this feature is not available with the threaded parallelization.

In your test_helper.rb add the following:

class ActiveSupport::TestCase
  parallelize_teardown do
    # drop databases
  end
end

# File activesupport/lib/active_support/test_case.rb, line 166
def parallelize_teardown(&block)
  ActiveSupport::Testing::Parallelization.run_cleanup_hook(&block)
end

Returns the order in which test cases are run.

ActiveSupport::TestCase.test_order # => :random

Possible values are :random, :parallel, :alpha, :sorted. Defaults to :random.

# File activesupport/lib/active_support/test_case.rb, line 61
def test_order
  ActiveSupport.test_order ||= :random
end

Sets the order in which test cases are run.

ActiveSupport::TestCase.test_order = :random # => :random

Valid values are:

• :random (to run tests in random order)

• :parallel (to run tests in parallel)

• :sorted (to run tests alphabetically by method name)

• :alpha (equivalent to :sorted)

# File activesupport/lib/active_support/test_case.rb, line 51
def test_order=(new_order)
  ActiveSupport.test_order = new_order
end

Alias for: refute_match

# File activesupport/lib/active_support/test_case.rb, line 288
    

Alias for: refute_empty

# File activesupport/lib/active_support/test_case.rb, line 211
    

Alias for: refute_equal

# File activesupport/lib/active_support/test_case.rb, line 222
    

Alias for: refute_in_delta

# File activesupport/lib/active_support/test_case.rb, line 233
    

Alias for: refute_in_epsilon

# File activesupport/lib/active_support/test_case.rb, line 244
    

Alias for: refute_includes

# File activesupport/lib/active_support/test_case.rb, line 255
    

Alias for: refute_instance_of

# File activesupport/lib/active_support/test_case.rb, line 266
    

Alias for: refute_kind_of

# File activesupport/lib/active_support/test_case.rb, line 277
    

Alias for: refute_nil

# File activesupport/lib/active_support/test_case.rb, line 299
    

Alias for: refute_operator

# File activesupport/lib/active_support/test_case.rb, line 310
    

Alias for: refute_predicate

# File activesupport/lib/active_support/test_case.rb, line 321
    

Alias for: refute_respond_to

# File activesupport/lib/active_support/test_case.rb, line 332
    

Alias for: refute_same

# File activesupport/lib/active_support/test_case.rb, line 343
    

Returns the current parallel worker ID if tests are running in parallel

# File activesupport/lib/active_support/test_case.rb, line 193
def parallel_worker_id
  self.class.parallel_worker_id
end