Testing javascript with Mocha - how can I use console log to debug a test

Question

I am using the javascript test-runner  Mocha    I have a test that is failing  so I would to debug it using console log   But when the tests are run  there is no output  only the test results from Mocha   It seems like Mocha has captured and suppressed my console log output   How can I get Mocha to show my output   at for tests that fail    EDIT   Huge apologies      console log does work during tests   I must have been expecting it to suppress the output  and I didn t properly check my own code   Thanks for responding  So    that being said    maybe it actually would be nice to suppress the output for tests that pass  hmm     On a related note  I want to use console log because I am having a lot of trouble trying to get the Eclipse debugger to connect to node js   Am I the only one who finds this tricky   How do you guys debug node js   With a debugger  or with console log statements

User · Answer

Use the debug lib   import debug from  debug  const log   debug  server      Use it   log  holi     then run   DEBUG server npm test   And that s it

User · Answer

If you are testing asynchronous code  you need to make sure to place done   in the callback of that asynchronous code  I had that issue when testing http requests to a REST API

User · Answer

I had an issue with node exe programs like test output with mocha  In my case  I solved it by removing some default  quot node exe quot  alias  I m using Git Bash for Windows 2 29 2  and some default aliases are set from  etc profile d aliases sh      show me alias related to  node      alias grep node   alias node  winpty node exe    To remove the alias  update aliases sh or simply do unalias node  I don t know why winpty has this side effect on console info buffered output but with a direct node exe use  I ve no more stdout issue

User · Answer

What Mocha options are you using   Maybe it is something to do with reporter  -R  or ui  -ui  being used   console log msg     works fine during my test runs  though sometimes mixed in a little goofy   Presumably due to the async nature of the test run   Here are the options  mocha opts  I m using   --require should -R spec --ui bdd   Hmm  just tested without any mocha opts and console log still works

User · Answer

You may have also put your console log after an expectation that fails and is uncaught  so your log line never gets executed

[javascript] Testing javascript with Mocha - how can I use console.log to debug a test?

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