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Troubleshooting

NameError: uninitialized constant MyModule::MyModelName

Try with full namespacing ::SomeModule::MyModule::MyModelName.

Debug Knapsack Pro on your development environment/machine

Regular Mode

To reproduce what Knapsack Pro executed on a specific CI node, check out the same branch and run:

KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC=MY_TOKEN \
KNAPSACK_PRO_CI_NODE_INDEX=MY_INDEX \
KNAPSACK_PRO_CI_NODE_TOTAL=MY_TOTAL \
KNAPSACK_PRO_BRANCH=MY_BRANCH \
KNAPSACK_PRO_COMMIT_HASH=MY_COMMIT \
KNAPSACK_PRO_CI_NODE_BUILD_ID=MY_BUILD_ID \
bundle exec rake "knapsack_pro:rspec[--seed MY_SEED]"

KNAPSACK_PRO_CI_NODE_BUILD_ID must be the same as the CI build you are trying to reproduce (if it helps, take a look at what Knapsack Pro uses as node_build_id for your CI provider).

You can also run the same subset of tests without Knapsack Pro: in the logs, find the command that Knapsack Pro used to invoke the test runner:

rspec  --default-path spec "spec/models/user_spec.rb" "spec/models/comment_spec.rb"

Queue Mode

To reproduce what Knapsack Pro executed on a specific CI node, check out the same branch and run:

KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC=MY_TOKEN \
KNAPSACK_PRO_CI_NODE_INDEX=MY_INDEX \
KNAPSACK_PRO_CI_NODE_TOTAL=MY_TOTAL \
KNAPSACK_PRO_BRANCH=MY_BRANCH \
KNAPSACK_PRO_COMMIT_HASH=MY_COMMIT \
KNAPSACK_PRO_CI_NODE_BUILD_ID=MY_BUILD_ID \
KNAPSACK_PRO_FIXED_QUEUE_SPLIT=true \
bundle exec rake "knapsack_pro:queue:rspec[--seed MY_SEED]"

KNAPSACK_PRO_CI_NODE_BUILD_ID must be the same as the CI build you are trying to reproduce (if it helps, take a look at what Knapsack Pro uses as node_build_id for your CI provider).

You can also run the same subset of tests without Knapsack Pro: in the logs, find the command that Knapsack Pro used to invoke the test runner.

You will find multiple commands to reproduce each batch:

[knapsack_pro] To retry the last batch of tests fetched from the API Queue, please run the following command on your machine:
[knapsack_pro] bundle exec rspec --format documentation --format RspecJunitFormatter --out tmp/rspec.xml --default-path spec --seed 24098 "spec/features/dashboard/billing/subscription_error_path_1_spec.rb[1:1:2:1:1:1]"

Or a single command at the end to execute all the batches the CI node executed:

[knapsack_pro] To retry all the tests assigned to this CI node, please run the following command on your machine:
[knapsack_pro] bundle exec rspec --format documentation --format RspecJunitFormatter --out tmp/rspec.xml --default-path spec --seed 24098 "spec/features/dashboard/billing/subscription_error_path_1_spec.rb[1:1:2:1:1:1]" "spec/features/dashboard/builds/build_distribution_for_build_spec.rb[1:1:1:10:2:1]" "spec/features/dashboard/builds/build_distribution_for_build_spec.rb[1:1:2:1]" "spec/features/dashboard/admin_statistics_spec.rb[1:6:1:1]" "spec/features/dashboard/identity_providers_spec.rb[1:6:1]" "spec/features/dashboard/onboarding_spec.rb[1:2:1:1:1]"

Knapsack Pro hangs

Some users reported frozen CI nodes with:

  • Test runners producing too much output (e.g., Codeship and Queue Mode): reduce it with KNAPSACK_PRO_LOG_LEVEL=warn

  • Test runners producing no output: make sure to use a formatter (like RSpec's --format progress)

  • Timecop (e.g., Travis): ensure Timecop.return is executed after all examples

    # spec/spec_helper.rb

    RSpec.configure do |c|
    c.after(:all) do
    Timecop.return
    end
    end
  • Chrome 83+ prevents downloads in sandboxed iframes: add an allow-downloads keyword in the sandbox attribute list

Knapsack Pro does not work on a forked repository

caution

Make sure your Knapsack Pro API token is set up as a secret in your CI (not hardcoded in the repository) to avoid leaking it.

Since the token won't be available on forked CI builds, you can use a script to run:

Create bin/knapsack_pro_tests, make it executable chmod u+x, and use it on CI to run your tests:

#!/bin/bash

if [ "$KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC" = "" ]; then
KNAPSACK_PRO_ENDPOINT=https://api-disabled-for-fork.knapsackpro.com \
KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC=disabled-for-fork \
KNAPSACK_PRO_MAX_REQUEST_RETRIES=0 \
bundle exec rake knapsack_pro:queue:rspec
else
bundle exec rake knapsack_pro:queue:rspec
fi

Error commit_hash parameter is required

Knapsack Pro takes KNAPSACK_PRO_COMMIT_HASH and KNAPSACK_PRO_BRANCH from the CI environment (see supported CIs). If your CI is not supported you may see the following error:

ERROR -- : [knapsack_pro] {"errors"=>[{"commit_hash"=>["parameter is required"]}]}

In such a case, you have two options:

LoadError: cannot load such file -- spec_helper

If you are using a complex KNAPSACK_PRO_TEST_FILE_PATTERN, Knapsack Pro could have problems finding the directory containing the spec_helper.rb file. Please set KNAPSACK_PRO_TEST_DIR.

CI builds fail with Test::Unit but all tests passed

Please ensure you are using Test::Unit only and not loading minitest too.

Tests hitting external APIs fail

Most likely, you have global shared state between your tests.

For example, you may have a hook that deletes Stripe data while a parallel CI node is testing the Stripe integration:

before(:each) do
Stripe::Subscription.all.each { |subscription| subscription.delete }
Stripe::Customer.all.each { |customer| customer.delete }
end

You can fix it by either:

  • Using a gem like VCR to record/replay your HTTP interactions
  • Write your tests so that they can run in parallel (e.g., each test creates/deletes its own Stripe data)

OpenSSL::SSL::SSLError

VCR, WebMock, or FakeWeb may trigger the following error when Knapsack Pro interacts with the Knapsack Pro API:

OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=error: tlsv1 alert internal error

Make sure to follow the steps to configure VCR/WebMock/FakeWeb.

ActiveRecord::SubclassNotFound

If files are changing during a tests run, you may get the following error:

ActiveRecord::SubclassNotFound:
Invalid single-table inheritance type: AuthenticationProviders::AnAuthenticationProvider is not a subclass of AuthenticationProvider

Please make sure classes are loaded once in the test environment:

# environments/test.rb

config.eager_load = true

Adding parallel CI nodes/jobs makes test slower

You can verify if the tests are getting slower on your Knapsack Pro dashboard:

  • Execution times of your CI builds are increasing: Recorded CI builds > Show (build) > Test Files > Total execution time
  • Individual test stats are trending up: Statistics of test files history > Stats (test file) > History of the test file (chart)

Here are the most common reasons:

  • CI nodes share resources (CPU/RAM/IO)
  • Tests are accessing the same resource (e.g., Stripe sandbox, database)
  • Your CI gives you a limited pool of parallel CI nodes (and runs the rest serially)

Some tests were skipped in Regular Mode

There is an unlikely scenario where some CI nodes may start in Fallback Mode but others in Regular Mode resulting in some tests being skipped. Our recommendations are either

FactoryBot/FactoryGirl raises in Queue Mode

  • Use the knapsack_pro binary:

    bundle exec knapsack_pro queue:rspec
  • Avoid implicit associations:

    # ⛔️ Bad
    FactoryBot.define do
    factory :assignment do
    task
    end
    end

    # ✅ Good
    FactoryBot.define do
    factory :assignment do
    association :task
    end
    end

One CI node run the test suite again in Queue Mode

Most likely, that CI node started when all the others finished running and initialized a new queue.

You have a couple of options:

Rake tasks under tests are run more than once in Queue Mode

Make sure the Rake task is loaded once:

before do
Rake::Task[MY_TASK_NAME].clear if Rake::Task.task_defined?(MY_TASK_NAME)
Rake.application.rake_require(MY_TASK_FILENAME)
Rake::Task.define_task(:environment)
end

Tests distribution is unbalanced in Queue Mode

Please consider:

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