jest-lambda-tester-example

Getting Started

Replace yarn with npm if you are not using yarn.

git clone https://github.com/mikechau/jest-lambda-tester-example.git
cd jest-lambda-tester-example
yarn install

Running Tests

yarn test

Results

When the lambda function being tested is throwing an error, Jest does not give us the relevant stacktrace.

yarn test v0.23.2
$ jest 
 FAIL  test/lambda/index.spec.js
  ● lambda › it returns s3 params

    expecting result but error was thrown
      
      at FailError (node_modules/lambda-tester/lib/runner.js:25:9)
      at process._tickCallback (internal/process/next_tick.js:109:7)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        0.862s, estimated 1s
Ran all test suites.
error Command failed with exit code 1.

Expected Results

A quickfix would be the add console.log(err) @ lib/runner.js:82.

yarn test v0.23.2
$ jest 
 FAIL  test/lambda/index.spec.js
  ● Console

    console.error node_modules/lambda-tester/lib/runner.js:82
      TypeError: Cannot read property 'match' of undefined
          at getFullVersion (/jest-lambda-tester-example/src/lambda/events/release/s3.js:43:389)
          at getS3Params (/jest-lambda-tester-example/src/lambda/events/release/s3.js:49:21)
          at _callee$ (/jest-lambda-tester-example/src/lambda/index.js:9:45)
          at tryCatch (/jest-lambda-tester-example/node_modules/regenerator-runtime/runtime.js:65:40)
          at GeneratorFunctionPrototype.invoke [as _invoke] (/jest-lambda-tester-example/node_modules/regenerator-runtime/runtime.js:303:22)
          at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] (/jest-lambda-tester-example/node_modules/regenerator-runtime/runtime.js:117:21)
          at step (/jest-lambda-tester-example/node_modules/babel-runtime/helpers/asyncToGenerator.js:17:30)
          at /jest-lambda-tester-example/node_modules/babel-runtime/helpers/asyncToGenerator.js:35:14
          at Promise.F (/jest-lambda-tester-example/node_modules/core-js/library/modules/_export.js:35:28)
          at /jest-lambda-tester-example/node_modules/babel-runtime/helpers/asyncToGenerator.js:14:12
          at /jest-lambda-tester-example/src/lambda/index.js:13:123
          at Array.map (native)
          at /jest-lambda-tester-example/src/lambda/index.js:7:38
          at /jest-lambda-tester-example/node_modules/apex.js/index.js:6:15
          at error (/jest-lambda-tester-example/node_modules/lambda-tester/lib/runner.js:150:25)
          at Promise.resolve.then (/jest-lambda-tester-example/node_modules/lambda-tester/lib/runner.js:137:24)
          at process._tickCallback (internal/process/next_tick.js:109:7)

  ● lambda › it returns s3 params

    expecting result but error was thrown
      
      at FailError (node_modules/lambda-tester/lib/runner.js:25:9)
      at process._tickCallback (internal/process/next_tick.js:109:7)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        0.867s, estimated 1s
Ran all test suites.
error Command failed with exit code 1.

Alternatively, the error message for expecting result but error was thrown could be formatted to be more detailed.