Library full of test utilities and helpers for New Relic instrumentation modules. The full documentation for this module can be found on GitHub.
It can be installed and used as such:
npm install @newrelic/test-utilities
// index.js
require('@newrelic/test-utilities')
The TestAgent class helps set up a New Relic agent suitable for tests. With
this you can run your tests within transactions without having to actually set
up a full New Relic application. The helper should be created and torn down for
each test to ensure you are running in a clean environment each time. In tap
this may look like this:
tap.test('some test suite', (t) => {
let helper = null
t.beforeEach((done) => {
helper = utils.TestAgent.makeInstrumented()
done()
})
t.afterEach((done) => {
helper && helper.unload()
done()
})
t.test('test 1', (t) => {
helper.runInTransaction((tx) => {
// Your test is now in transaction context and normal instrumentation
// logic should occur.
})
})
})
There are a number of assertions provided to help write your tests. Each of
these assertions can either be used directly (utils.assert.segments(...)
) or
as tap tests (t.segments(...)
). In the direct use case they will throw
exceptions, and thus can be used like any other assertion library. Here are a
few examples of using them:
let tap = require('tap')
let utils = require('@newrelic/test-utilities')
// This adds all the assertions to tap's `Test` class.
utils.assert.extendTap(tap)
tap.test((t) => {
let helper = utils.TestAgent.makeInstrumented()
t.tearDown(() => helper.unload())
helper.runInTransaction((tx) => {
// Do some testing logic...
// This will check that transaction state hasn't been lost and that the given
// transaction is the currently active one. A good check to make in the
// callbacks to asynchronous methods.
t.transaction(tx, 'should be in correct context')
// This will check that the transaction trace has the segment structure you
// describe. Extra segments in the trace are allowed.
t.segments(tx.trace.root, [{name: 'mysegment'}], 'should have expected segments')
// Like above, this checks the structure of the trace against the one you
// describe but they must exactly match. Any extra segments in the trace are
// considered a failure.
t.exactSegments(tx.trace.root, [{name: 'mysegment'}], 'should have expected segments')
// Many metrics are not created until the transaction ends, if you're
// missing metrics in your instrumentation tests, this may help.
tx.end()
// This will check that the metrics given have been created. Extra metrics
// are allowed.
t.metrics(['/My/Metric'], 'should have created metrics')
// Like above, this checks that the given metrics were created. Any extra
// metrics that were created are considered a failure.
t.exactMetrics(['/My/Metric', '/Another/Metric'], 'should have exactly these metrics')
})
})
The versioned-tests
script can be used to execute a series of tests against
several versions of dependencies. For example, the command below would run all
the tests suffixed with .tap.js
against every minor version of the specified
dependencies.
$ versioned-tests --minor tests/versioned/*.tap.js
The following command will run only those test files whose names include the keyword redis:
$ versioned-tests tests/versioned/ -P redis
You can then specify the versions you want to run this against by adding a
package.json
file in your tests directory. This package file should have a
tests
array describing each suite. For example, the one shown below will test
different files for each version of mongodb
from v1.0.0
through to the latest.
{
"name": "mongodb-tests",
"version": "0.0.0",
"private": true,
"tests": [
{
"engines": {
"node": ">=0.10 <7"
},
"dependencies": {
"mongodb": "^1"
},
"files": [
"v1-tests.tap.js"
]
},
{
"engines": {
"node": ">=0.10"
},
"dependencies": {
"mongodb": ">=2.1 <3"
},
"files": [
"v2-tests.tap.js",
"shared-tests.tap.js"
]
},
{
"engines": {
"node": ">=4"
},
"dependencies": {
"mongodb": ">=3"
},
"files": [
"v3-tests.tap.js",
"shared-tests.tap.js"
]
}
]
}
The versioned tests runner has a timeout for tests that defaults to one minute. That is, if running a test -- including installing its dependencies! -- takes longer than a minute, then that test is considered to have failed. You can change this timeout with the TEST_CHILD_TIMEOUT
environment variable, which is interpreted as a number of milliseconds. For example, to set a test timeout of ten minutes, you could invoke the test runner like this:
$ TEST_CHILD_TIMEOUT=600000 versioned-tests
As ten minutes is 600,000 milliseconds.
The module includes a suite of unit and functional tests which should be used to verify that your changes don't break existing functionality.
All tests are stored in tests/
and are written using
Node-Tap with the extension .tap.js
.
To run the full suite, run: npm test
.
Individual test scripts include:
npm run lint
npm run unit
Should you need assistance with New Relic products, you are in good hands with several support channels.
If the issue has been confirmed as a bug or is a feature request, please file a GitHub issue.
Support Channels
- GitHub Documentation: Test Utilities specific documentation
- New Relic Documentation: Comprehensive guidance for using our platform
- New Relic Community: The best place to engage in troubleshooting questions
- New Relic Developer: Resources for building a custom observability applications
- New Relic University: A range of online training for New Relic users of every level
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New Relic Test Utilities is licensed under the Apache 2.0 License.
New Relic Test Utilities also uses source code from third-party libraries. You can find full details on which libraries are used and the terms under which they are licensed in the third-party notices document.