@knapsack-pro/gherkin-cucumber


@knapsack-pro/gherkin-cucumber runs your tests with Gherkin/Testcafe test runner and does dynamic tests allocation across parallel CI nodes using KnapsackPro.com Queue Mode to provide the fastest CI build time (optimal test suite timing).

Learn about Knapsack Pro Queue Mode in the video how to run tests with dynamic test suite split and learn what CI problems can be solved thanks to it.

Table of Contents

- Installation
- How to use
- Configuration steps
- CI steps
- CircleCI
- Travis CI
- Buildkite.com
- Codeship.com
- Heroku CI
- Solano CI
- AppVeyor
- GitLab CI
- GitLab CI >= 11.5
- GitLab CI < 11.5 (old GitLab CI)
- SemaphoreCI.com
- Semaphore 2.0
- Semaphore 1.0
- Cirrus-CI.org
- Jenkins
- GitHub Actions
- Codefresh.io
- Other CI provider
- FAQ
- Knapsack Pro Core features FAQ
- How to run tests only from specific directory?
- How to exclude tests to ignore them from running?
- How to pass command line options?
- Development
- Requirements
- Dependencies
- Setup
- Publishing
- Testing
- CI
- Example Jest test suite

Installation

Please ensure you have added jest package in your project package.json.
@knapsack-pro/jest uses jest version installed in your project.

For npm users:

``
$ npm install --save-dev @knapsack-pro/jest
`

For yarn users:

`
$ yarn add --dev @knapsack-pro/jest
`

Whenever you see npm in below steps you can use yarn there as well.

How to use

$3

1. To get API token just sign up at KnapsackPro.com. Please add to your CI environment variables KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST. You can generate API token in user dashboard.

Next to your API token, you can find a link "Build metrics" where you can preview recorded CI builds. You will see yellow tips if something is not configured as expected. Refresh the page once you finish running tests to see new tips. You can also click "Show" on CI build to see details about particular CI build. Look for yellow tips suggesting what to change to ensure all works fine for your project.

2. (optional) Do you want to use "retry single failed parallel CI node" feature for your CI? For instance some of CI providers like Travis CI, Buildkite or Codeship allows you to retry only one of failed parallel CI node instead of retrying the whole CI build with all parallel CI nodes. If you want to be able to retry only single failed parallel CI node then you need to tell Knapsack Pro API to remember the way how test files where allocated across parallel CI nodes by adding to your CI environment variables KNAPSACK_PRO_FIXED_QUEUE_SPLIT=true.

The default is KNAPSACK_PRO_FIXED_QUEUE_SPLIT=false which means when you want to retry the whole failed CI build then a new dynamic test suite split will happen across all retried parallel CI nodes thanks to Knapsack Pro Queue Mode. Some people may prefer to retry the whole failed CI build with test files allocated across parallel CI nodes in the same order as it happend for the failed CI build - in such case you should set KNAPSACK_PRO_FIXED_QUEUE_SPLIT=true.

3. (optional) If one of the parallel CI nodes starts work very late after other parallel CI nodes already finished work.

Some of CI providers have a problem with starting parallel CI nodes as soon as possible. For instance, you have a fixed pool of parallel CI nodes shared with many CI builds and sometimes CI build has started work even the pool has not enough available parallel CI nodes at the moment. Another case is when the CI provider infrastructure is overloaded which can lead to some parallel CI nodes starting work later than others.

Do you have the CI server that does not start all parallel CI nodes at the same time and one of your parallel CI nodes will start work very late after all other parallel CI nodes already finished consuming tests from the Knapsack Pro Queue? In such a case, if you would use default KNAPSACK_PRO_FIXED_QUEUE_SPLIT=false then the very late CI node would start running all tests again based on a new Queue which means you would run test suite twice. This problem can happen if your test suite is very small and differences in the start time of parallel CI nodes are very big.

You should set KNAPSACK_PRO_FIXED_QUEUE_SPLIT=true to ensure the very late parallel CI node won't run tests again if the Queue was already consumed. The downside of this is that you won't be able to run 2nd CI build for the same set of values git commit/branch/ci node total number with a dynamic test suite split way if your CI provider does not expose unique CI build ID. Instead, the tests will be run assigned to the same parallel CI node indexes with the same order as it was recorded for the first time.

Knapsack Pro tries to detect CI build ID from the environment variables of your CI provider. Here you can check if your CI provider exposes CI build ID, see function ciNodeBuildId (example for Github Actions). If you CI provider won't provide CI build ID you can set KNAPSACK_PRO_CI_NODE_BUILD_ID (see next point).

4. (optional) @knapsack-pro/jest detects information about CI build from supported CI environment variables. When information like git branch name and git commit hash cannot be detect from CI environment variables then @knapsack-pro/jest will try to use git installed on CI machine to detect the infomation. If you don't have git installed then you should set the information using environment variables:

- KNAPSACK_PRO_COMMIT_HASH - git commit hash (SHA1)
- KNAPSACK_PRO_BRANCH - git branch name
- KNAPSACK_PRO_CI_NODE_BUILD_ID - a unique ID for your CI build. All parallel CI nodes being part of single CI build must have the same node build ID. Example how to generate node build ID: KNAPSACK_PRO_CI_NODE_BUILD_ID=$(openssl rand - base64 32).

5. If you have test files in a non-default directory or you specify test files to run in Jest config file then you won't be able to run tests and you may see below error.

`
Response body:
{ errors: [ { test_files: [ 'parameter is required' ] } ] }
`

Please adjust KNAPSACK_PRO_TEST_FILE_PATTERN variable to match your test files directory structure to let Knapsack Pro detect all the test files you want to run in parallel. You can also exclude test files with KNAPSACK_PRO_TEST_FILE_EXCLUDE_PATTERN.

6. If you want to use Jest config file with @knapsack-pro/jest check this tip.

7. If you use --coverage flag for Jest to generate code coverage then to make it work please check how to generate code coverage for Jest with @knapsack-pro/jest in Queue Mode?

8. If you use jest-junit please check how to generate XML report using jest-junit with @knapsack-pro/jest in Queue Mode?

9. Please select your CI provider and follow instructions to run tests with @knapsack-pro/jest.

- CircleCI
- Travis CI
- Buildkite.com
- Codeship.com
- Heroku CI
- Solano CI
- AppVeyor
- GitLab CI
- SemaphoreCI.com
- Cirrus-CI.org
- Jenkins
- GitHub Actions
- Codefresh.io
- Other CI provider

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#### CircleCI

Example configuration for CircleCI 2.0 platform.

`YAML


~/.circleci/config.yml

version: 2
jobs:
test:
docker:
- image: circleci/:
parallelism: 2 # run 2 parallel CI nodes

steps:
- checkout

- run:
name: Run Jest tests with @knapsack-pro/jest using Knapsack Pro Queue Mode
command: $(npm bin)/knapsack-pro-jest
`

Please remember to add additional parallel containers for your project in CircleCI settings.

#### Travis CI

You can parallelize your CI build across virtual machines with travis matrix feature.

`yaml


.travis.yml

script:
- '$(npm bin)/knapsack-pro-jest'

env:
global:
- KNAPSACK_PRO_CI_NODE_TOTAL=2
# allows to be able to retry failed tests on one of parallel job (CI node)
- KNAPSACK_PRO_FIXED_QUEUE_SPLIT=true

jobs:
- KNAPSACK_PRO_CI_NODE_INDEX=0
- KNAPSACK_PRO_CI_NODE_INDEX=1
`

The configuration will generate matrix with 2 parallel jobs (2 parallel CI nodes):

`


first CI node (first parallel job)

KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=0

second CI node (second parallel job)

KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=1
`

More info about global and matrix ENV configuration in travis docs.

#### Buildkite.com

The only thing you need to do is to configure the parallelism parameter (number of parallel agents) in your build step and run the below command in your build:

`
$(npm bin)/knapsack-pro-jest
`

If you want to use Buildkite retry single agent feature to retry just failed tests on particular agent (CI node) then you should set KNAPSACK_PRO_FIXED_QUEUE_SPLIT=true.

Other useful resources:

Here you can find article how to set up a new pipeline for your project in Buildkite and configure Knapsack Pro and 2 example repositories for Ruby/Rails projects:

- Buildkite Rails Parallel Example with Knapsack Pro
- Buildkite Rails Docker Parallel Example with Knapsack Pro

When using the docker-compose plugin on Buildkite, you have to tell it which environment variables to pass to the docker container. Thanks to it Knapsack Pro can detect info about CI build like commit, branch name, amount of parallel nodes.

`yaml
steps:
- label: 'Test'
parallelism: 2
plugins:
- docker-compose#3.0.3:
run: app
command: $(npm bin)/knapsack-pro-jest
config: docker-compose.test.yml
env:
- BUILDKITE_PARALLEL_JOB_COUNT
- BUILDKITE_PARALLEL_JOB
- BUILDKITE_BUILD_NUMBER
- BUILDKITE_COMMIT
- BUILDKITE_BRANCH
`

#### Codeship.com

Codeship does not provide parallel jobs environment variables so you will have to define KNAPSACK_PRO_CI_NODE_TOTAL and KNAPSACK_PRO_CI_NODE_INDEX for each parallel test pipeline. Below is an example for 2 parallel test pipelines.

Configure test pipelines (1/2 used)

`


first CI node running in parallel


KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=0 $(npm bin)/knapsack-pro-jest
`

Configure test pipelines (2/2 used)

`


second CI node running in parallel


KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=1 $(npm bin)/knapsack-pro-jest
`

Remember to add API token KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST to Environment page of your project settings in Codeship.

CodeShip uses the same build number if you restart a build. Because of that you need to set KNAPSACK_PRO_FIXED_QUEUE_SPLIT=true in order to be able to restart CI build.

#### Heroku CI

You can parallelize your tests on Heroku CI by configuring app.json for your project.

You can set how many parallel dynos with tests you want to run with quantity value.
Use test key to run tests with @knapsack-pro/jest as shown in below example.

You need to specify also the environment variable KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST with API token for Knapsack Pro.
For any sensitive environment variables (like Knapsack Pro API token) that you do not want commited in your app.json manifest, you can add them to your pipeline’s Heroku CI settings.

`


app.json


{
"environments": {
"test": {
"formation": {
"test": {
"quantity": 2
}
},
"addons": [
"heroku-postgresql"
],
"scripts": {
"test": "$(npm bin)/knapsack-pro-jest"
},
"env": {
"KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST": "example"
}
}
}
}
`

If you would like to run multiple Knapsack Pro commands for different test runners on Heroku CI please follow tips.

Note the Heroku CI Parallel Test Runs are in Beta and you may need to ask Heroku support to enable it for your project.

You can learn more about Heroku CI.

#### Solano CI

Solano CI does not provide parallel jobs environment variables so you will have to define KNAPSACK_PRO_CI_NODE_TOTAL and KNAPSACK_PRO_CI_NODE_INDEX for each parallel job running as part of the same CI build.

`


Step for first CI node

KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=0 $(npm bin)/knapsack-pro-jest

Step for second CI node

KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=1 $(npm bin)/knapsack-pro-jest
`

Please remember to set up API token KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST as global environment.

#### AppVeyor

AppVeyor does not provide parallel jobs environment variables so you will have to define KNAPSACK_PRO_CI_NODE_TOTAL and KNAPSACK_PRO_CI_NODE_INDEX for each parallel job running as part of the same CI build.

`


Step for first CI node

KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=0 $(npm bin)/knapsack-pro-jest

Step for second CI node

KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=1 $(npm bin)/knapsack-pro-jest
`

Please remember to set up API token KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST as global environment.

#### GitLab CI

Remember to add API token KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST to Secret Variables in Gitlab CI Settings -> CI/CD Pipelines -> Secret Variables.

##### GitLab CI >= 11.5

`yaml
test:
parallel: 2
script: $(npm bin)/knapsack-pro-jest
`

Here you can find info how to configure the GitLab parallel CI nodes.

##### GitLab CI < 11.5 (old GitLab CI)

GitLab CI does not provide parallel jobs environment variables so you will have to define KNAPSACK_PRO_CI_NODE_TOTAL and KNAPSACK_PRO_CI_NODE_INDEX for each parallel job running as part of the same test stage. Below is relevant part of .gitlab-ci.yml configuration for 2 parallel jobs.

`


.gitlab-ci.yml

stages:
- test

variables:
KNAPSACK_PRO_CI_NODE_TOTAL: 2

first CI node running in parallel

test_ci_node_0:
stage: test
script:
- export KNAPSACK_PRO_CI_NODE_INDEX=0
- $(npm bin)/knapsack-pro-jest

second CI node running in parallel

test_ci_node_1:
stage: test
script:
- export KNAPSACK_PRO_CI_NODE_INDEX=1
- $(npm bin)/knapsack-pro-jest
`

#### SemaphoreCI.com

##### Semaphore 2.0

@knapsack-pro/jest supports environment variables provided by Semaphore CI 2.0 to run your tests. You will have to define a few things in .semaphore/semaphore.yml config file.

- You need to set KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST. If you don't want to commit secrets in yml file then you can follow this guide.
- You should create as many parallel jobs as you need with parallelism property. If your test suite is slow you should use more parallel jobs.

Below you can find example part of Semaphore CI 2.0 config.

`yaml
blocks:
- name: Jest tests
task:
env_vars:
- name: KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST
value: your_api_token_here
prologue:
commands:
- checkout
- nvm install --lts carbon
- sem-version node --lts carbon

jobs:
- name: Run tests with Knapsack Pro
parallelism: 2
commands:
- $(npm bin)/knapsack-pro-jest
`

##### Semaphore 1.0

The only thing you need to do is set up @knapsack-pro/jest for as many parallel threads as you need. Here is an example:

`


Thread 1

$(npm bin)/knapsack-pro-jest

Thread 2

$(npm bin)/knapsack-pro-jest
`

Tests will be split across 2 parallel threads.

Please remember to set up API token KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST as global environment.

#### Cirrus-CI.org

The only thing you need to do is to configure number of parallel CI nodes for your project by using matrix modification. See example for 2 parallel CI nodes.

`


.cirrus.yml


task:
matrix:
name: CI node 0
name: CI node 1
test_script: $(npm bin)/knapsack-pro-jest
`

Please remember to set up API token KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST as global environment.

Here is Ruby example for .cirrus.yml configuration file that you may find useful.

#### Jenkins

In order to run parallel jobs with Jenkins you should use Jenkins Pipeline.
You can learn basics about it in the article Parallelism and Distributed Builds with Jenkins.

Here is example Jenkinsfile working with Jenkins Pipeline.

`
timeout(time: 60, unit: 'MINUTES') {
node() {
stage('Checkout') {
checkout([/ checkout code from git /])

// determine git commit hash because we need to pass it to Knapsack Pro
COMMIT_HASH = sh(returnStdout: true, script: 'git rev-parse HEAD').trim()

stash 'source'
}
}

def num_nodes = 4; // define your total number of CI nodes (how many parallel jobs will be executed)
def nodes = [:]

for (int i = 0; i < num_nodes; i++) {
def index = i;
nodes["ci_node_${i}"] = {
node() {
stage('Setup') {
unstash 'source'
// other setup steps
}

def knapsack_options = """\
KNAPSACK_PRO_CI_NODE_TOTAL=${num_nodes}\
KNAPSACK_PRO_CI_NODE_INDEX=${index}\
KNAPSACK_PRO_COMMIT_HASH=${COMMIT_HASH}\
KNAPSACK_PRO_BRANCH=${env.BRANCH_NAME}\
KNAPSACK_PRO_CI_NODE_BUILD_ID=${env.BUILD_TAG}\
"""

// example how to run tests with Knapsack Pro
stage('Run tests') {
sh """${knapsack_options} $(npm bin)/knapsack-pro-jest"""
}
}
}
}

parallel nodes // run CI nodes in parallel
}
`

Remember to set environment variable KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST in Jenkins configuration with your API token.

#### GitHub Actions

@knapsack-pro/jest supports environment variables provided by GitHub Actions to run your tests. You have to define a few things in .github/workflows/main.yaml config file.

- You need to set KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST environment variable in GitHub repository Settings -> Secrets. See creating and using secrets in GitHub Actions.
- You should create as many parallel jobs as you need with matrix.ci_node_total and matrix.ci_node_index properties. If your test suite is slow you should use more parallel jobs.

Below you can find config for GitHub Actions.

`yaml


.github/workflows/main.yaml

name: Main

on: [push]

jobs:
build:
runs-on: ubuntu-latest

strategy:
fail-fast: false
matrix:
node-version: [8.x]
# Set N number of parallel jobs you want to run tests on.
# Use higher number if you have slow tests to split them on more parallel jobs.
# Remember to update ci_node_index below to 0..N-1
ci_node_total: [2]
# set N-1 indexes for parallel jobs
# When you run 2 parallel jobs then first job will have index 0, the second job will have index 1 etc
ci_node_index: [0, 1]

steps:
- uses: actions/checkout@v1

- name: Use Node.js ${{ matrix.node-version }}
uses: actions/setup-node@v1
with:
node-version: ${{ matrix.node-version }}

- name: npm install and build
run: |
npm install
npm run build --if-present

- name: Run tests with Knapsack Pro
env:
KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST: ${{ secrets.KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST }}
KNAPSACK_PRO_CI_NODE_TOTAL: ${{ matrix.ci_node_total }}
KNAPSACK_PRO_CI_NODE_INDEX: ${{ matrix.ci_node_index }}
# allows rerun parallel jobs with the same set of tests
# that were consumed from Queue in the very first CI build run
KNAPSACK_PRO_FIXED_QUEUE_SPLIT: true
run: |
$(npm bin)/knapsack-pro-jest
`

#### Codefresh.io

@knapsack-pro/jest supports environment variables provided by Codefresh.io to run your tests. You have to define a few things in .codefresh/codefresh.yml config file.

- You need to set an API token KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST in Codefresh dashboard, see left menu Pipelines -> settings (cog icon next to the pipeline) -> Variables tab (see a vertical menu on the right side).
- Set where Codefresh YAML file can be found. In Codefresh dashboard, see left menu Pipelines -> settings (cog icon next to pipeline) -> Workflow tab (horizontal menu on the top) -> Path to YAML (set there ./.codefresh/codefresh.yml).
- Set how many parallel jobs (parallel CI nodes) you want to run with KNAPSACK_PRO_CI_NODE_TOTAL environment variable in .codefresh/codefresh.yml file.
- Ensure in the matrix section you listed all KNAPSACK_PRO_CI_NODE_INDEX environment variables with a value from 0 to KNAPSACK_PRO_CI_NODE_TOTAL-1. Codefresh will generate a matrix of parallel jobs where each job has a different value for KNAPSACK_PRO_CI_NODE_INDEX. Thanks to that Knapsack Pro knows what tests should be run on each parallel job.

Below you can find Codefresh YAML config and Test.Dockerfile used by Codefresh to run the project and Jest test suite inside of Docker container.

`yaml


.codefresh/codefresh.yml

version: '1.0'

stages:
- 'clone'
- 'build'
- 'tests'

steps:
main_clone:
type: 'git-clone'
description: 'Cloning main repository...'
repo: '${{CF_REPO_OWNER}}/${{CF_REPO_NAME}}'
revision: '${{CF_BRANCH}}'
stage: 'clone'
BuildTestDockerImage:
title: Building Test Docker image
type: build
arguments:
image_name: '${{CF_ACCOUNT}}/${{CF_REPO_NAME}}-test'
tag: '${{CF_BRANCH_TAG_NORMALIZED}}-${{CF_SHORT_REVISION}}'
dockerfile: Test.Dockerfile
stage: 'build'

run_tests:
stage: 'tests'
image: '${{BuildTestDockerImage}}'
working_directory: /src
fail_fast: false
environment:
# set how many parallel jobs you want to run
- KNAPSACK_PRO_CI_NODE_TOTAL=2
matrix:
environment:
# please ensure you have here listed N-1 indexes
# where N is KNAPSACK_PRO_CI_NODE_TOTAL
- KNAPSACK_PRO_CI_NODE_INDEX=0
- KNAPSACK_PRO_CI_NODE_INDEX=1
commands:
- $(npm bin)/knapsack-pro-jest
`

Add Test.Dockerfile to your project repository.

`Dockerfile
FROM node:10.13

RUN apt-get update && \
apt-get install -y \
python3-dev \
python3-pip

Install AWS CLI

RUN pip3 install awscli

Install Codefresh CLI

RUN wget https://github.com/codefresh-io/cli/releases/download/v0.31.1/codefresh-v0.31.1-alpine-x64.tar.gz
RUN tar -xf codefresh-v0.31.1-alpine-x64.tar.gz -C /usr/local/bin/

COPY . /src

WORKDIR /src

RUN npm install
`

#### Other CI provider

You have to define KNAPSACK_PRO_CI_NODE_TOTAL and KNAPSACK_PRO_CI_NODE_INDEX for each parallel job running as part of the same CI build.

`


Step for first CI node

KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=0 $(npm bin)/knapsack-pro-jest

Step for second CI node

KNAPSACK_PRO_CI_NODE_TOTAL=2 KNAPSACK_PRO_CI_NODE_INDEX=1 $(npm bin)/knapsack-pro-jest
`

Please remember to set up API token KNAPSACK_PRO_TEST_SUITE_TOKEN_JEST as global environment.

FAQ

:heavy_exclamation_mark: NEW: Up to date FAQ for Knapsack Pro Jest can be found here.

OLD: This README also contains FAQ questions but we keep adding new info only to our new FAQ page mentioned above.

We keep this old FAQ in README to not break old links spread across the web.

$3

This project depends on @knapsack-pro/core. Please check the FAQ for @knapsack-pro/core to learn more about core features available to you.

$3

You can set KNAPSACK_PRO_TEST_FILE_PATTERN="{/__tests__//.js?(x),/?(.)(spec|test).js?(x)}" and change pattern to match your directory with test files. You can use glob pattern.

@knapsack-pro/jest by default rejects tests inside of node_modules directory. If your pattern set by KNAPSACK_PRO_TEST_FILE_PATTERN matches test file paths within node_modules then those test file paths won't be run.

If you want to use a few patterns you can do it as shown above KNAPSACK_PRO_TEST_FILE_PATTERN="{pattern_1,pattern_2}".

If you want to use single pattern then you can do KNAPSACK_PRO_TEST_FILE_PATTERN="__tests__/*/.test.js".

$3

You can set KNAPSACK_PRO_TEST_FILE_EXCLUDE_PATTERN which define a glob pattern to exclude tests similar to Jest testPathIgnorePatterns parameter. Note testPathIgnorePatterns uses regexp pattern while KNAPSACK_PRO_TEST_FILE_EXCLUDE_PATTERN uses glob pattern.

$3

UP TO DATE ANSWER: https://knapsackpro.com/faq/question/how-to-pass-command-line-options-to-jest

You can pass command line options to Jest by just passing them to @knapsack-pro/jest. See example:

`
$(npm bin)/knapsack-pro-jest --debug
`

You can find list of Jest CLI options here.

Development

$3

You can use NVM to manage Node version in development.

- >= Node 12.18.3 LTS

$3

- @knapsack-pro/core

$3

1. Setup @knapsack-pro/core project.

Follow below steps or use bin/setup_development script to take care of steps 2-5.

2. Install dependencies:

`
$ npm install
`

3. In order to use local version of @knapsack-pro/core run:

`
$ npm link @knapsack-pro/core
`

4. Compile TypeScript code to lib directory by running:

`
$ npm start
`

5. Register @knapsack-pro/jest package globally in your local system. This way we will be able to develop other npm packages dependent on it:

`
$ npm link
`

6. Set up your IDE:

- Visual Studio Code

- Install the following plugins:

- Prettier - Code formatter
- ESLint
- TypeScript TSLint Plugin
- EditorConfig for VS Code

- Go to File > Preferences > Settings > Text Editor > Formatting

Turn on Format On Save checkbox.

From now on every change in code base will be automatically formatted by Prettier. ESLint and TSLint errors will be also automatically fixed on every file save.

7. Write some code.

$3

1. Sign in to npm registry with command:

`
$ npm adduser
`

2. Ensure you have the latest version of @knapsack-pro/core in package.json:

`
{
"dependencies": {
"@knapsack-pro/core": "^x.x.x"
}
}
`

Then run npm install. This way you will be able to test @knapsack-pro/core installed from npm registry instead of local one that was linked with npm link @knapsack-pro/core.

Now commit updated package.json and package-lock.json.

`
$ git commit -am "Update @knapsack-pro/core"
`

3. Before releasing a new version of package please update CHANGELOG.md with github_changelog_generator:

`
$ gem install github_changelog_generator

# generate CHANGELOG.md
$ github_changelog_generator --user KnapsackPro --project knapsack-pro-jest
$ git commit -am "Update CHANGELOG.md"
$ git push origin master
`

4. If you have added new files to the repository and they should be part of the released npm package then please ensure they are included in files array in package.json.

5. If you have changed any headers in README.md please refresh table of contents with:

`
$ npm run doctoc
`

6. Compile project:

`
# ensure you use local version of @knapsack-pro/core
$ npm link @knapsack-pro/core

$ npm run build
`

7. In order to bump version of the package run below command. It will also create a version commit and tag for the release:

`
# bump patch version 0.0.x
$ npm version patch

# bump minor version 0.x.0
$ npm version minor
`

8. Push to git repository created commit and tag:

`
$ git push origin master --tags
`

9. Now when git tag is on Github you can update CHANGELOG.md again.

`
$ github_changelog_generator --user KnapsackPro --project knapsack-pro-jest
$ git commit -am "Update CHANGELOG.md"
$ git push origin master
`

10. Now you can publish package to npm registry:

`
$ npm publish
`

11. Update the latest available library version in TestSuiteClientVersionChecker for the Knapsack Pro API repository.

$3

#### CI

If your feature requires code change in @knapsack-pro/core then please push the @knapsack-pro/core to GitHub first. Then you can push changes for @knapsack-pro/jest to ensure the CI will use the latest @knapsack-pro/core.

#### Example Jest test suite

To test @knapsack-pro/jest` against real test suite we use:

- jest-example-test-suite project.
- react