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METexpress Test Suite

The METexpress tests are Cucumber and Webdriver-based acceptance tests. Access to certain data in the METexpress team's database is required.

Setup

We've found nvm is useful to manage node versions. Instructions on how to install node via NVM can be found here: https://github.com/nvm-sh/nvm#install--update-script. Once NVM is installed you can install the desired version of Node (we usually use the latest or match the version required by the version of Meteor we're on) and the dependencies required to run the tests by doing:

nvm install && npm install

Running

The default test configuration is in the wdio.conf.js file. Currently, the tests are configured to run 'maxInstances' Chrome instances. There are options to run with regular Chrome or headless Chrome. We'd recommend headless Chrome so the test suite doesn't take over your laptop's desktop.

You can run tests via npm by calling the scripts in package.json like so:

  • npm run test
  • npm run test:headless
  • npm run test:debug
  • npm run test:debug:headless

You can pass flags like so:

  • npm run test -- --baseUrl 'https://esrl.noaa.gov/gsd/int-mats'

Otherwise, there are also some shell scripts in the METexpress/tests directory that offer an easy start to running the test suite.

Directory structure

The METexpress/tests/src directory structure is from the webdriver.io cucumber boilerplate project because that is what was used to make the tests run, their directory structure is easy to navigate.  

Their predefined step definitions are left intact so that they can be used in the future, or at least used for reference.

METexpress/tests/src/features

This is where all the feature files are, much like the old features directories except I left out the load and performance subdirectories - which we weren't using anyway.

METexpress/tests/src/steps

Has given.js, then.js, and when.js. These have our cucumber step mappings, and they have the standard boilerplate ones as well - again mostly for reference.

METexpress/tests/src/support 

This has action/, check/, and lib/ subdirs and this holds all the step definition files. We have definitions that match our tests as well as the standard boilerplate ones.

Discussion

Increasing memory allocated to node

There could be a webdriver memory leak or maybe our tests are just "hoggy", but we had to increase the node memory allocation to keep from occasionally getting weird javascript errors. You do that by executing this command:

  • export NODE_OPTIONS="--max-old-space-size=8192"

inside your terminal prior to running the tests or by prefixing the below commands with the following

  • env NODE_OPTIONS="--max-old-space-size=8192" <npx command here>

This is taken care of in the npm run commands and in the shell scripts.

Invocations

This is the standard command line invocation from the tests directory

  • npx wdio run wdio.conf.js

It will run 3 instances and it will test against METexpress internal dev server.

This will test against mats-int

  • npx wdio run wdio.conf.js --baseUrl 'https://esrl.noaa.gov/gsd/int-mats'

This will use 2 parallel instances and run against mats-int

  • npx wdio run wdio.conf.js --baseUrl 'https://esrl.noaa.gov/gsd/int-mats' --maxInstances 2

This will run a single feature

Note this is a relative path - you need to be in the METexpress/tests directory

npx wdio run wdio.conf.js \
    --baseUrl 'https://esrl.noaa.gov/gsd/int-mats' \
    --spec ./src/features/met-airquality/basic/addRemoveContour.feature

Running tests with different reporters

By default the wdio.conf.js specifies the spec reporter. We can also specify a reporter like below which would run the default dot reporter. Any of the supported reporters can be specified in this manner.

npx wdio run wdio.conf.js \
    --reporters dot

Running tests as they change

You can have WebdriverIO watch your spec files and run them as they change by doing:

npx wdio run wdio.conf.js --watch