Print wrong count concurrent jobs in debug log

[outsideris]

Description

In mocha:cli:run:helpers debug logs, it will print current concurrent jobs like below:

$ DEBUG=mocha:cli:run:helpers ./bin/mocha --parallel -jobs=3 sample.test.js
  mocha:cli:run:helpers files (in order):  [ '/Users/jeonghoon/Dropbox/projects/github/mocha/tt.js' ] +0ms
  mocha:cli:run:helpers executing 1 test file(s) across 3 concurrent jobs +0ms

But without --jobs option, it prints NaN.

$ DEBUG=mocha:cli:run:helpers ./bin/mocha --parallel sample.test.js
  mocha:cli:run:helpers files (in order):  [ '/Users/jeonghoon/Dropbox/projects/github/mocha/tt.js' ] +0ms
  mocha:cli:run:helpers executing 1 test file(s) across NaN concurrent jobs +0ms

Steps to Reproduce

Run mocha with --parallel option but, without --jobs option.

$ DEBUG=mocha:cli:run:helpers ./bin/mocha --parallel sample.test.js

Expected behavior: [What you expect to happen]
Print current concurrent job count instead NaN.

Versions

• The output of mocha --version and node node_modules/.bin/mocha --version: 8.1.1
• The output of node --version: v12.18.1
• Your operating system
  • name and version: macOS
  • architecture (32 or 64-bit): 64bit
• Your shell (e.g., bash, zsh, PowerShell, cmd): zsh

[boneskull]

fixed in #4416