docs(samples): convert samples tests to use mocha

[vijay-qlogic]

Fixes nodejs-speeech: Convert all sample tests to mocha (it's a good idea to open an issue first for discussion)

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[JustinBeckwith]

Just a reminder to come back around and investigate the test failures :)

[vijay-qlogic]

Yes, I'm looking into it.. Facing some challenges to resolve the issues here.

[JustinBeckwith]

Coo. Let me know if I can help!

[codecov]

Codecov Report

Merging #221 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #221   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines          35     35           
=====================================
  Hits           35     35

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[vijay-qlogic]

One test "should run sync recognize with enhanced model"
in file "samples/system-test/recognize.test.js" on line no.129 is failing.

To fix that we need to enable "data logging" for "Cloud Speech API" in our project "Grass Clump 479"

Here is link to enable that Enable data logging

I do not have enough permissions to do so

[JustinBeckwith]

👋 the test failure looks unrelated to that though:

 1) BetaFeatures
       should run speech diarization on a local file:
      AssertionError [ERR_ASSERTION]: false == true
      + expected - actual
      -false
      +true
      at Context.it (system-test/betaFeatures.test.js:58:12)
      at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:188:7)