Using a technique outlined in another answer I was able to write a test for the --help
switch:
const expect = require('chai').expect
const exec = require('child_process').exec
const cli = './cli.js'
describe('help', function () {
var capturedStdout
var capturedStderr
// http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html
// var cmd = cli + " --help 1>&2"
var cmd = cli + ' --help'
before(function (done) {
exec(cmd, function (error, stdout, stderr) {
if (error) done(error)
capturedStdout = stdout
capturedStderr = stderr
done()
})
})
it('should succeed', () => {
expect(capturedStderr).be.empty
})
it('should have some usage instructions', () => {
expect(capturedStdout).to.match(/Usage: words \[options] \[pattern]/)
})
it('should show a sematic version number', () => {
// http://rubular.com/r/lTC1wu95jq
expect(capturedStdout).to.match(/v\d+\.\d+\.\d+/)
})
it('should have some examples', () => {
expect(capturedStdout).to.match(/Examples:/)
})
})
There are two problems I'm having:
describe
block for a different switch, for example --version
, then I get the following error: Error: done() called multiple times
The solution is to move the test into another file.
Is there a better way to do what I want? All I want to do is repeatedly run my executable while testing stdout, stderr, and the exit status.
not to answer your entire question but you are missing a return statement
before(function (done) {
exec(cmd, function (error, stdout, stderr) {
if (error) {
return done(error)
}
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