loadmill

Loadmill

Users of Loadmill can use this node module to:

1. Run API tests on loadmill.com.
2. Run load tests on loadmill.com.
3. Do both programmatically or via CLI.

Installation

Using npm:

npm install loadmill --save

Using yarn:

yarn add loadmill

If you need to run the loadmill CLI outside of an npm script, you may prefer to install this package globally.

Using npm:

npm install -g loadmill

Using yarn:

yarn global add loadmill

Usage

API Tokens

In order to use the Loadmill REST API or our node module and CLI, you will need to generate an API Token.

Test Suites

You may launch an existing test suite by supplying the suite id - this is usually useful for testing your API for regressions after every new deployment. Test suites are launched and not awaiting the results.

const loadmill = require('loadmill')({token: process.env.LOADMILL_API_TOKEN});

/**
 * @returns { id: 'uuid', type: 'test-suite' }
 */
const result = await loadmill.runTestSuite({id: "test-suite-uuid"});

You can also extend the suite object:

const result = await loadmill.runTestSuite({
    id: "test-suite-uuid",
    additionalDescription: "description to add", //optional
    labels: ["label1", "label2"] //optional - run flows that are assigned to specific label/s
}

Load tests

The following code runs a very simple load test that gets a single page from www.myapp.com every second for one minute:

const loadmill = require('loadmill')({token: process.env.LOADMILL_API_TOKEN});

// You may also give a path to a valid Test Configuration JSON file instead:
const id = await loadmill.run({requests: [{url: "www.myapp.com"}]});
console.log("Load test started: " + id);

Test Configuration

The JSON test configuration may be exported from the loadmill test editor or from an old test run.

Read more about the configuration format here.

Waiting for Tests

Since load tests usually run for at least a few minutes, the loadmill client does not wait for them to finish by default. You can explicitly wait for a test to finish using the wait function:

/**
* @returns {id: string, type: 'load' | 'test-suite', passed: boolean, url: string}
*/
loadmill.run("./load-tests/long_test.json")
   .then(loadmill.wait)
   .then(result => console.log(result));

// promise with async/await
const loadTestId = await loadmill.run({ requests: [{ url: "www.myapp.com" }] });
const result = await loadmill.wait(loadTestId);

Promises vs Callbacks

Every function that accepts a callback will return a promise instead if no callback is provided (and vice versa):

loadmill.run("./load-tests/simple.json")
    .then(id => console.log("Load test started: ", id))
    .catch(err => console.error("Something bad: ", err));

Running multiple tests

In case you wish to run all the Loadmill tests in a given folder you can use the runFolder API. It will execute all the tests synchronously (using the wait option by default) unless a test has failed. This API returns an array of the tests result:

/**
* @returns [{id: string, type: 'load', passed: boolean, url: string}]
*/
loadmill.runFolder("/path/to/tests/folder")
       .then(results => console.log(results));

Parameters

You will usually want some part of your test to be dynamic, e.g. the host name of the tested server. With Loadmill, this is made easy by using parameters. You may set/override parameter defaults for a test by passing a hash mapping parameter names to values:

// Parameters may come before or instead of a callback:
loadmill.run("./load-tests/parametrized_test.json", {host: "test.myapp.com", port: 4443}, (err, id) => {/*...*/});

CLI

The loadmill Command Line Interface basically wraps the functions provided by the node module:

loadmill <load-config-file-or-folder | test-suite-id> -t <token> [options] [parameter=value...]

Test suites

You may launch a test suite by setting the -s or --test-suite option:

loadmill test-suite-id --test-suite -t DW2rTlkNmE6A3ax5LVTSDxv2Jfw4virjQpmbOaLG

The test suite will be launched and its unique identifier will be printed to the standard output. You may alternatively set the -w or --wait option in order to wait for the test-suite to finish, in which case only the result JSON will be printed out at the end

You can add an additional description at the end of the current suite's description with the --additional-description <description> option.

You can tell loadmill to run flows that are assigned to a specific label with the --labels <labels> option. Multiple labels can be provided by seperated them with "," (e.g. 'label1,label2').

loadmill <test-suite-id> --test-suite -t <token> --labels "label1,label2"

Load Tests

You may launch a load test by setting the -l or --load-test option:

loadmill test.json --load-test -t DW2rTlkNmE6A3ax5LVTSDxv2Jfw4virjQpmbOaLG

The load test will be launched and its unique identifier will be printed to the standard output. You may alternatively set the -w or --wait option in order to wait for the load test to finish, in which case only the result JSON will be printed out at the end:

loadmill test.json -lw -t DW2rTlkNmE6A3ax5LVTSDxv2Jfw4virjQpmbOaLG

Exit Status

Unless the -n or --no-bail option is set, the CLI process will exit with a nonzero exit code if the test had not passed. Other errors, such as invalid command line arguments or unavailable network will always give a nonzero exit status.

Parameters

You may set loadmill parameter values via command line arguments by passing name=value pairs:

loadmill parametrized_test.json host=test.myapp.com port=4443 -t DW2rTlkNmE6A3ax5LVTSDxv2Jfw4virjQpmbOaLG

CLI Options

Full list of command line options:

• -h, --help Output usage information.
• -t, --token <token> Provide a Loadmill API Token. You must provide a token in order to run tests.
• -l, --load-test Launch a load test.
• -s, --test-suite Launch a test suite. If set then a test suite id must be provided instead of config file.
• --additional-description <description> Add an additional description at the end of the current suite's description - available only for test suites.
• --labels <labels>, Run flows that are assigned to a specific label. Multiple labels can be provided by seperated them with "," (e.g. 'label1,label2').
• -w, --wait Wait for the test to finish.
• -n, --no-bail Return exit code 0 even if test fails.
• -q, --quiet Do not print out anything (except errors).
• -v, --verbose Print out extra information for debugging (trumps -q). In case of an error will print the entire test's requests otherwise will print only the failed request.
• --colors Print test results in color.