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lambda-tester
Advanced tools
Simplifies writing unit tests for AWS Lambda functions using Node.js.
LAMBDA_TASK_ROOT
to the application's rootInstall via npm.
npm install lambda-tester --save-dev
Lambda handlers with support for callbacks use the typical Node.js asynchronous signature:
exports.handler = function( event, context, callback ) {
callback( null, 'success!' );
}
The following example shows a simple case for validating that the Lambda (handler) was called successfully (i.e. callback( null, result )
:
const LambdaTester = require( 'lambda-tester' );
const myHandler = require( '../index' ).handler;
describe( 'handler', function() {
it( 'test success', async function() {
await LambdaTester( myHandler )
.event( { name: 'Fred' } )
.expectResult();
});
});
If the handler calls callback( err )
, then the test will fail.
Additionally, if one wanted to test for failure, then the following code would be used:
const LambdaTester = require( 'lambda-tester' );
const myHandler = require( '../index' ).handler;
describe( 'handler', function() {
it( 'test failure', async function() {
await LambdaTester( myHandler )
.event( { name: 'Unknown' } )
.expectError();
});
});
Note: you must either return the LambdaTester
instance back to the testing
framework or use the await
/async
keywords.
Complete documentation can be found in our documentation page.
lambda-tester
We'd love to get feedback on how you're using lambda-tester and things we could add to make this tool better. Feel free to contact us at feedback@vandium.io
Starting with version 4.0, lambda-tester supports node versions 10 and higher. If you require support for older versions of node, then use a previous version of lambda-tester.
4.0.1 (2019-12-04)
Update:
FAQs
Unit/Integration tests for AWS Lambda handlers
The npm package lambda-tester receives a total of 28,925 weekly downloads. As such, lambda-tester popularity was classified as popular.
We found that lambda-tester demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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