logtrap

Capture stdout/stderr for testing purposes

Why?

To test applications where the output matters

Usage

Install logtrap

  $ npm install logtrap

Setup tests that need to capture output

  require 'mocha'
  { expect } = require 'chai' # or your favorite assertion tool
  { stdoutTrap, stderrTrap } = require 'logtrap'

# Some function that outputs to stdout
  logger = (type, msg) -> console[type] "#{type}: #{msg}"

# Test
  describe 'Capture outputs', ->
    it 'should suppress stderr and capture instead', ->
      good = stdoutTrap -> logger 'log', "All systems go!"
      expect(good).to.equal "log: All systems go!\n"
    it 'should suppress stderr and capture instead', ->
      bad = stderrTrap -> logger 'error', "It's a trap"
      expect(bad).to.equal "error: It's a trap\n"

View pretty test results

  # Test outputs
  Capture console.log
    ✓ should suppress stderr and capture instead
    ✓ should suppress stderr and capture instead

  # Note that the test results are not polluted with the output logs

Notes

• [^.^]

License

Logtrap is released under the MIT License.