How To Tag And Run End-to-End Tests

How to tag your Cypress tests to make sure anyone can quickly test the changes.

Let's say you have hundreds of end-to-end tests (this is our current situation at Mercari US). Running the tests in parallel makes the test run faster, but there is a problem. If someone inside the organization wants to change how some internal service operates, or changes a particular database field, you do not want to run all the tests. Or at least, you want to run the tests for that product area first to provide fast and useful feedback. This is how I organize and tag my end-to-end tests and run them.

🧰 I will be using the repo bahmutov/test-todomvc-using-app-actions as my example. It only has about 30 tests, but the lessons scale even better when the number of tests is large.

Organize the tests by feature

The first thing I do is to split a single long spec file into separate spec files. Each spec file is focused on a particular application feature. I try to keep the spec duration under two minutes, and I split long tests to make them easier to run. Currently I have 8 specs in the project:

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$ npx find-cypress-specs
cypress/integration/adding-spec.js,cypress/integration/clear-completed-spec.js,
cypress/integration/complete-all-spec.js,cypress/integration/editing-spec.js,
cypress/integration/item-spec.js,cypress/integration/persistence-spec.js,
cypress/integration/routing-spec.js,cypress/integration/spec.js

Tip: I will use find-cypress-specs utility to print specs and test names.

In each spec file, I add a tag to the suite of tests using the cypress-grep convention. For example, the tests related to routing are tagged @routing. The @ character has no special meaning, it just makes it simpler to find it in the source code.

cypress/integration/routing-spec.js
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describe('TodoMVC', function () {
beforeEach(function () {
cy.visit('/')
})

context('Routing', { tags: '@routing' }, function () {
it('should allow me to display active items', function () {
...
})

it('should respect the back button', function () {
...
})

...
})
})

I can see all tests and their tags using find-cypress-specs with --names argument.

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$ npx find-cypress-specs --names

cypress/integration/adding-spec.js (7 tests)
└─ TodoMVC
├─ New Todo [@adding]
│ ├─ should allow me to add todo items
│ ├─ adds items
│ ├─ should clear text input field when an item is added
│ ├─ should append new items to the bottom of the list
│ ├─ should trim text input
│ └─ should show #main and #footer when items added
└─ Adds items (spy example)
└─ calls inform

cypress/integration/clear-completed-spec.js (3 tests)
└─ TodoMVC
└─ Clear completed button [@complete]
├─ should display the correct text
├─ should remove completed items when clicked
└─ should be hidden when there are no items that are completed

cypress/integration/complete-all-spec.js (3 tests)
└─ TodoMVC
└─ Mark all as completed [@complete]
├─ should allow me to mark all items as completed
├─ should allow me to clear the complete state of all items
└─ complete all checkbox should update state when items are completed / cleared

cypress/integration/editing-spec.js (5 tests)
└─ TodoMVC
└─ Editing [@editing]
├─ should hide other controls when editing
├─ should save edits on blur
├─ should trim entered text
├─ should remove the item if an empty text string was entered
└─ should cancel edits on escape

cypress/integration/item-spec.js (3 tests)
└─ TodoMVC
└─ Item [@item]
├─ should allow me to mark items as complete
├─ should allow me to un-mark items as complete
└─ should allow me to edit an item

cypress/integration/persistence-spec.js (1 test)
└─ TodoMVC
└─ Persistence [@persistence]
└─ should persist its data

cypress/integration/routing-spec.js (5 tests)
└─ TodoMVC
└─ Routing [@routing]
├─ should allow me to display active items
├─ should respect the back button
├─ should allow me to display completed items
├─ should allow me to display all items
└─ should highlight the currently applied filter

cypress/integration/spec.js (3 tests)
└─ TodoMVC
├─ When page is initially opened
│ └─ should focus on the todo input field
├─ No Todos
│ └─ should hide #main and #footer
└─ Counter
└─ should display the current number of todo items

found 8 specs and 30 tests

Not all tests need tags. For example, the last spec.js collects miscellaneous tests without any tags.

Run any changed tests first

I have shown how to run the changed specs first, see GitHub Actions post or CircleCI post. In my example application, I am using CircleCI, here is how I run the changed specs before running all tests. You can find the full CircleCI config file at circle.yml.

circle.yml
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version: 2.1
orbs:
# https://github.com/cypress-io/circleci-orb
cypress: cypress-io/[email protected]
workflows:
build:
jobs:
- cypress/run:
name: Run changed tests
start: npm start
no-workspace: true
command: |
# stop if on master branch - all tests should run there
if [ "$CIRCLE_BRANCH" = "master" ]; then
echo "Default branch, will run all tests"
exit 0
fi

# be careful about counting the lines
specsLines=$(git diff --name-only --diff-filter=AMR origin/master | { grep cypress/integration || true; })
n=$(echo $specsLines | sed '/^\s*$/d' | wc -l | tr -d ' ')
specs=$(echo $specsLines | sed '/^\s*$/d' | tr '\n' ',')
echo ""
echo "Changed and added ${n} Cypress specs"
echo ${specs}
echo ""
if [ ${n} -lt 1 ]; then
echo "No Cypress specs changed, exiting..."
exit 0
fi
# we have to form the Cypress run command ourselves
npx cypress run --spec ${specs}

- cypress/run:
name: Run all tests
requires:
- Run changed tests
build: npm run print-tests
start: npm start
no-workspace: true

If we push a branch change1 where we just change something in cypress/integration/routing.js file, we see that test executed first.

Workflow with two jobs

Inside the "Run changed tests" job, Cypress shows the specs it is about to execute.

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Changed and added 1 Cypress specs
cypress/integration/complete-all-spec.js,
...
====================================================================================================

(Run Starting)

┌────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Cypress: 9.2.0 │
│ Browser: Electron 94 (headless) │
│ Node Version: v12.19.0 (/usr/local/bin/node) │
│ Specs: 1 found (complete-all-spec.js) │
│ Searched: cypress/integration/complete-all-spec.js, │
└────────────────────────────────────────────────────────────────────────────────────────────────┘

Running the changed tests first gives us fast feedback. If the changed tests pass, all tests execute to confirm the application works. Notice that running the changed tests is much faster compared to running all tests.

The changed specs job is shorter than running all specs job

The sanity tag

As the number of specs grows, running all tests on every pull request becomes a burden on the infrastructure and CI resources. Thus I recommend creating a small set of sanity tests, with one test per feature. We can tag these tests @sanity and run on every pull request by default. Here are the tagged tests

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$ npx find-cypress-specs --names

cypress/integration/adding-spec.js (7 tests)
└─ TodoMVC
├─ New Todo [@adding]
│ ├─ should allow me to add todo items
│ ├─ adds items [@sanity]
│ ├─ should clear text input field when an item is added
│ ├─ should append new items to the bottom of the list
│ ├─ should trim text input
│ └─ should show #main and #footer when items added
└─ Adds items (spy example)
└─ calls inform

cypress/integration/clear-completed-spec.js (3 tests)
└─ TodoMVC
└─ Clear completed button [@complete]
├─ should display the correct text
├─ should remove completed items when clicked [@sanity]
└─ should be hidden when there are no items that are completed

cypress/integration/complete-all-spec.js (3 tests)
└─ TodoMVC
└─ Mark all as completed [@complete]
├─ should allow me to mark all items as completed
├─ should allow me to clear the complete state of all items [@sanity]
└─ complete all checkbox should update state when items are completed / cleared

cypress/integration/editing-spec.js (5 tests)
└─ TodoMVC
└─ Editing [@editing]
├─ should hide other controls when editing
├─ should save edits on blur [@sanity]
├─ should trim entered text
├─ should remove the item if an empty text string was entered
└─ should cancel edits on escape

cypress/integration/item-spec.js (3 tests)
└─ TodoMVC
└─ Item [@item]
├─ should allow me to mark items as complete [@sanity]
├─ should allow me to un-mark items as complete
└─ should allow me to edit an item

cypress/integration/persistence-spec.js (1 test)
└─ TodoMVC
└─ Persistence [@persistence]
└─ should persist its data [@sanity]

cypress/integration/routing-spec.js (5 tests)
└─ TodoMVC
└─ Routing [@routing]
├─ should allow me to display active items
├─ should respect the back button
├─ should allow me to display completed items [@sanity]
├─ should allow me to display all items
└─ should highlight the currently applied filter

cypress/integration/spec.js (3 tests)
└─ TodoMVC
├─ When page is initially opened
│ └─ should focus on the todo input field
├─ No Todos
│ └─ should hide #main and #footer
└─ Counter
└─ should display the current number of todo items [@sanity]

found 8 specs and 30 tests

We can run the sanity tests instead of all the tests. Let's modify the "Run all specs" job by passing grepTags parameter through the Cypress environment variables. This is how you control the cypress-grep plugin.

circle.yml
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- cypress/run:
name: Run sanity tests
requires:
- Run changed tests
build: npm run print-tests
start: npm start
no-workspace: true
env: [email protected]

If you look at the CircleCI output, you can see that cypress-grep plugin is working

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cypress-grep: filtering using tag "@sanity"
cypress-grep: will omit filtered tests
cypress-grep: filtering specs using tag "@sanity"

The final test run only executed 8 tests.

CircleCI job only ran 8 sanity tests

Bonus: running just the sanity tests and skipping the rest saves on your Cypress Dashboard bill 💸

All tests

Hmm, we should still run all tests sometimes. The best solution is to run all tests periodically, for example every night, plus on demand by triggering the workflow using something like bahmutov/run-cy-on-ci. I have added a workflow to run all tests nightly

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workflows:
nightly:
triggers:
- schedule:
cron: '0 0 * * *'
filters:
branches:
only:
- master

jobs:
- cypress/run:
name: Run all tests
build: npm run print-tests
start: npm start
no-workspace: true
build:
...

Run all tests with a tag on CI

CircleCI

Imagine someone is changing a component related to editing the Todo text on the page. They have deployed the site and want to run all end-to-end tests related to editing items. Without code coverage it is hard to say which E2E tests should run. Well, in general we run the sanity tests and we should run all tests tagged @editing. Let's allow anyone to trigger the CI workflow and to pass the tag to the test job. I will add a new workflow and pipeline parameters to the circle.yml file.

circle.yml
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parameters:
GREP_TAGS:
type: enum
enum:
[
'',
'@sanity',
'@adding',
'@complete',
'@editing',
'@item',
'@persistence',
'@routing',
]
default: ''

workflows:
nightly:
...

tagged:
when: << pipeline.parameters.GREP_TAGS >>
jobs:
- cypress/run:
name: Run tagged tests
build: npm run print-tests
start: npm start
no-workspace: true
env: grepTags=<< pipeline.parameters.GREP_TAGS >>

build:
unless: << pipeline.parameters.GREP_TAGS >>
...

Our new workflow tagged only runs when there is GREP_TAGS string and an empty default string "" does not count. Let's trigger the workflow from the CircleCI web interface.

Click the "Trigger pipeline" button

Add a string parameter named GREP_TAGS and enter one of the above enum values, like @editing.

Enter the tag to use to filter the tests

The workflow tagged runs, while the normal workflow is skipped. On other commits, the entire build workflow runs, while the tagged workflow is skipped.

Workflows skipped depending on the GREP_TAGS parameter

The workflows are enabled and disabled using the pipeline parameter

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tagged:
when: << pipeline.parameters.GREP_TAGS >>
...

build:
unless: << pipeline.parameters.GREP_TAGS >>

GitHub Actions

The user who tries to run the tests by a tag on CircleCI has to remember how to trigger the workflow and add the right parameter. I would like the experience to be simpler. Thus I looked at using GitHub Actions with its new "workflow_dispatch" workflows. In the .github/workflows/tagged.yml I have defined a workflow where each input parameter is a boolean for the tag to run. It looks scary, but this is simple repetition: each tag matches one input parameter and one job to run.

.github/workflows/tagged.yml
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name: tagged
on:
workflow_dispatch:
inputs:
# these inputs will be shown to the user on GitHub Actions page
# and the user can simply check off the tags to run
sanity:
description: Run the tests tagged "@sanity"
required: false
type: boolean
adding:
description: Run the tests tagged "@adding"
required: false
type: boolean
...

jobs:
tagged:
runs-on: ubuntu-20.04
steps:
- name: Checkout 🛎
uses: actions/[email protected]

# install dependencies and start the server
# https://github.com/cypress-io/github-action
- name: Install dependencies 📦
uses: cypress-io/[email protected]
with:
runTests: false

- name: Start the server 🚀
run: npm start &

- name: Run sanity tests
if: ${{ github.event.inputs.sanity == 'true' }}
uses: cypress-io/[email protected]
with:
install: false
env: [email protected]

- name: Run adding tests
if: ${{ github.event.inputs.adding == 'true' }}
uses: cypress-io/[email protected]
with:
install: false
env: [email protected]

...

This is pretty sweet - any user with GitHub access to the repo can click on the button "Run workflow" and check off the tags to test.

Pick the test tags to run

Only the picked test tags execute, the other steps are skipped.

Running just the selected sets of tests on GitHub

Beautiful.

Separate jobs

Instead of having a single job executing tagged tests, we could have created a separate job for each tag that can be picked. These jobs could all work in parallel. Here is the main part of the tagged-jobs.yml

.github/workflows/tagged-jobs.yml
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# separate running each grep tag into own job
name: tagged-jobs
on:
workflow_dispatch:
inputs:
# these inputs will be shown to the user on GitHub Actions page
# and the user can simply check off the tags to run
sanity:
description: Run the tests tagged "@sanity"
required: false
type: boolean
adding:
description: Run the tests tagged "@adding"
required: false
type: boolean
...

jobs:
# each job is independent from other jobs
# and only runs the tests for the picked test tag
sanity:
if: ${{ github.event.inputs.sanity == 'true' }}
runs-on: ubuntu-20.04
steps:
- name: Checkout 🛎
uses: actions/[email protected]

- name: Run sanity tests
uses: cypress-io/[email protected]
with:
start: npm start
env: [email protected]

adding:
if: ${{ github.event.inputs.adding == 'true' }}
runs-on: ubuntu-20.04
steps:
- name: Checkout 🛎
uses: actions/[email protected]

- name: Run adding tests
uses: cypress-io/[email protected]
with:
start: npm start
env: [email protected]

...

Now we can pick the features to test without worrying about a long queue of tests running sequentially.

Pick as many features to test as you wish

The screenshot below shows how the jobs proceed in parallel with each other

The parallel test jobs each running tagged tests

Fast.

The regression tag

Imagine you are deploying a schema change in the database, or fiddling with some API service. You might not know which area of the site you might have broken. Running all tests might take too long, and running just the tests tagged @sanity is not enough - they are only covering the essential user paths. We need something in between the @sanity list and all the tests.

This is where the @regression tag comes in. We can mark a big chunk of the tests with this tag, and whenever we want to confirm the site still works, we run those tests by tag. Of course, running all the tests could be better, but there is a trade off: speed vs completeness.

Here is how the "clear-completed-spec.js" looks. The tests tagged @sanity get the second tag, and another test now gets its @regression tag.

cypress/integration/clear-completed-spec.js
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describe('TodoMVC', function () {
context('Clear completed button', { tags: '@complete' }, function () {
it('should display the correct text', function () { ... })

it('should remove completed items when clicked',
{ tags: ['@sanity', '@regression'] },
function () { ... })

it('should be hidden when there are no items that are completed',
{ tags: '@regression' },
function () { ... })
})
})

In general, the @regression set is a superset of the @sanity tests.

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$ npx find-cypress-specs --names | grep '@sanity' | wc -l
8
$ npx find-cypress-specs --names | grep '@regression' | wc -l
17

The full test outline

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$ npx find-cypress-specs --names

$ npx find-cypress-specs --names

cypress/integration/adding-spec.js (7 tests)
└─ TodoMVC
├─ New Todo [@adding]
│ ├─ should allow me to add todo items [@regression]
│ ├─ adds items [@sanity, @regression]
│ ├─ should clear text input field when an item is added [@regression]
│ ├─ should append new items to the bottom of the list
│ ├─ should trim text input [@regression]
│ └─ should show #main and #footer when items added
└─ Adds items (spy example)
└─ calls inform

cypress/integration/clear-completed-spec.js (3 tests)
└─ TodoMVC
└─ Clear completed button [@complete]
├─ should display the correct text
├─ should remove completed items when clicked [@sanity, @regression]
└─ should be hidden when there are no items that are completed [@regression]

cypress/integration/complete-all-spec.js (3 tests)
└─ TodoMVC
└─ Mark all as completed [@complete]
├─ should allow me to mark all items as completed [@regression]
├─ should allow me to clear the complete state of all items [@sanity, @regression]
└─ complete all checkbox should update state when items are completed / cleared

cypress/integration/editing-spec.js (5 tests)
└─ TodoMVC
└─ Editing [@editing]
├─ should hide other controls when editing
├─ should save edits on blur [@sanity]
├─ should trim entered text
├─ should remove the item if an empty text string was entered
└─ should cancel edits on escape

cypress/integration/item-spec.js (3 tests)
└─ TodoMVC
└─ Item [@item]
├─ should allow me to mark items as complete [@sanity, @regression]
├─ should allow me to un-mark items as complete [@regression]
└─ should allow me to edit an item

cypress/integration/persistence-spec.js (1 test)
└─ TodoMVC
└─ Persistence [@persistence]
└─ should persist its data [@sanity, @regression]

cypress/integration/routing-spec.js (5 tests)
└─ TodoMVC
└─ Routing [@routing]
├─ should allow me to display active items [@regression]
├─ should respect the back button
├─ should allow me to display completed items [@sanity, @regression]
├─ should allow me to display all items [@regression]
└─ should highlight the currently applied filter

cypress/integration/spec.js (3 tests)
└─ TodoMVC
├─ When page is initially opened [@regression]
│ └─ should focus on the todo input field
├─ No Todos
│ └─ should hide #main and #footer [@regression]
└─ Counter
└─ should display the current number of todo items [@sanity, @regression]

found 8 specs and 30 tests

I have updated the CircleCI and the GitHub Actions workflows to allow selecting @regression tag.

Manually running all regression tests on GitHub

A single job ran executing just the regression tests

The final tag organization

To summarize: we have organized our tests using tags. There are feature-level tags like @editing and two "coverage" tags: @sanity and @regression. The sets of tests overlap, and there might be tests without any tags.

Test tag coverage

On every pull request we execute the changed specs and then run @sanity tests. Whenever someone is working on the feature, they can quickly run the tests for that feature using the individual feature tag. When in doubt, you can execute a wider set of tests using @regression tag. To completely test the software (which we can do periodically), one can run all the tests without any filtering by tag.

Bonus 1: GitHub triggers CircleCI

If you have implemented running tests on CircleCI, but want to use the GitHub Actions user interface, you can collect the tags and trigger the CircleCI pipeline, see trigger-circleci.yml workflow file.

trigger-circleci.yml
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name: trigger-circleci
on:
workflow_dispatch:
inputs:
# these inputs will be shown to the user on GitHub Actions page
# and the user can simply check off the tags to run
sanity:
description: Run the tests tagged "@sanity"
required: false
type: boolean
regression:
description: Run the tests tagged "@regression"
required: false
type: boolean
...
jobs:
trigger-circleci:
runs-on: ubuntu-20.04
steps:
- name: Print GitHub event inputs
env:
EVENT: ${{ toJson(github.event.inputs) }}
run: |
echo "$EVENT"
# all environment variables that start with GITHUB_
# https://github.com/bahmutov/print-env
npx @bahmutov/print-env GITHUB_
- name: Trigger CircleCI run
env:
CIRCLE_CI_API_TOKEN: ${{ secrets.CIRCLE_CI_API_TOKEN }}
run: |
# collect all input parameters into one string
TAGS=
if [[ "${{ github.event.inputs.sanity }}" == "true" ]]; then
TAGS="@sanity"
fi
if [[ "${{ github.event.inputs.regression }}" == "true" ]]; then
TAGS="$TAGS @regression"
fi
if [[ "${{ github.event.inputs.adding }}" == "true" ]]; then
TAGS="$TAGS @adding"
fi
...
echo "Collected tags: $TAGS"
# https://github.com/bahmutov/trigger-circleci-pipeline
npx trigger-circleci-pipeline \
--org bahmutov --project test-todomvc-using-app-actions \
--branch $GITHUB_REF_NAME --parameters GREP_TAGS="$TAGS"

I am using print-env to print the GitHub environment variables and trigger-circleci-pipeline to trigger the CircleCI pipeline via API (you will need your personal CircleCI API token to work).

Bonus 2: When you have a lot of test tags

If you have a lot of test tags, and want to let the user pick the ones to run from GitHub user interface, using individual input workflow parameters quickly runs into the ten parameters max limit (January 2022). Thus I have reworked the above workflow to let the user pick some common sets (like the regression the and sanity sets) using checkboxes, and let the user pick other tags to run by entering them as a single string. Find the full workflow at trigger-circle-type.yml

.github/workflows/trigger-circle-type.yml
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name: trigger-circleci-type
on:
workflow_dispatch:
inputs:
# these inputs will be shown to the user on GitHub Actions page
# and the user can simply check off the tags to run
# the two sets of tests covering most of the features
# NOTE: GitHub workflows are limited to ten input parameters
sanity:
description: Run the tests tagged "@sanity"
required: false
type: boolean
regression:
description: Run the tests tagged "@regression"
required: false
type: boolean
# tests for individual features - the user will need to type the tags
# comma-separated in order to avoid hitting then ten workflow input limit
testTags:
description: |
Other test tags to run, comma-separated. Includes @adding, @complete,
@editing, @item, @persistence, @routing
...
# collect all input parameters into one string
TAGS=
if [[ "${{ github.event.inputs.sanity }}" == "true" ]]; then
TAGS="@sanity"
fi
if [[ "${{ github.event.inputs.regression }}" == "true" ]]; then
TAGS="$TAGS,@regression"
fi
if [[ "${{ github.event.inputs.testTags }}" != "" ]]; then
TAGS="$TAGS,${{ github.event.inputs.testTags }}"
fi

I include the available tags in the description, so it is easy to remember the choices.

Picking the test tags to run

Tip: I pass the additional custom tag as a string "Blog post demo" - that is purely to tag the recorded Dashboard run to make it simple to find it.

The recorded run has all selected test tags and the custom tag string

Tip 2: use the Cypress Dashboard tag dropdown to filter the recorded runs by a tag.

Available tags to filter the runs by