Add test coverage reporting

[kkoskelin]

As an aid to ensuring proper coverage, I've installed istanbul and configured coverage numbers that ought to ensure the threshold reflects current coverage and do not slip below those given numbers.

------------------------------|---------|----------|---------|---------|----------------------------------------------------------------------------
File                          | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                                                          
------------------------------|---------|----------|---------|---------|----------------------------------------------------------------------------
All files                     |   88.38 |    76.48 |   90.87 |   88.78 |                                                                            
 lib                          |   84.76 |     51.3 |   93.33 |   84.23 |                                                                            
  routes.js                   |   78.05 |    34.83 |     100 |   77.78 | 24,38,74,79,107,112,122,151,156,168,170,184,189,200,202,213,222,227        
  s3rver.js                   |   82.64 |    65.96 |   88.24 |   82.35 | 70-72,99,111,116,122,152,153,175,191-194,196,233,237,247,253,259,260       
  utils.js                    |   96.97 |    94.44 |   93.75 |   96.67 | 65,85                                                                      
 lib/controllers              |   90.27 |    86.51 |     100 |   90.38 |                                                                            
  bucket.js                   |   90.43 |    87.84 |     100 |   91.15 | 146,157,171,184,199,206,285,290,376,380                                    
  object.js                   |   89.83 |    84.62 |     100 |   89.53 | 24,119,125,169,170,174,175,274,308,313,347,353,467,473,518,524,579,586     
  service.js                  |     100 |      100 |     100 |     100 |                                                                            
 lib/middleware               |   89.46 |    84.44 |   94.29 |   89.57 |                                                                            
  authentication.js           |    87.5 |    80.21 |     100 |   87.41 | 145,146,152,178,219,239,252,262,296,312,356,379,412,420,421,427,446        
  cors.js                     |   94.44 |    90.63 |     100 |   94.29 | 22,29                                                                      
  logger.js                   |     100 |      100 |     100 |     100 |                                                                            
  response-header-override.js |   95.65 |    92.31 |     100 |   95.45 | 35                                                                         
  vhost.js                    |     100 |      100 |     100 |     100 |                                                                            
  website.js                  |   86.24 |    82.35 |      75 |   86.79 | 16,24,49,50,174,178,188,194,200,201,239,242,247,249                        
 lib/models                   |   85.35 |    83.33 |   77.78 |   85.94 |                                                                            
  account.js                  |   81.82 |      100 |   66.67 |   81.82 | 16,17                                                                      
  bucket.js                   |     100 |      100 |     100 |     100 |                                                                            
  config.js                   |    78.3 |     81.2 |   73.91 |   79.21 | 28,38,49,65,74,142-144,146,157,167,180,181,187,188,204,216,224,238,245,351 
  error.js                    |   86.96 |    57.14 |      70 |   86.36 | 9,69,75                                                                    
  event.js                    |     100 |      100 |     100 |     100 |                                                                            
  object.js                   |     100 |      100 |     100 |     100 |                                                                            
  routing-rule.js             |   95.24 |    96.15 |     100 |   95.24 | 51                                                                         
 lib/stores                   |   91.36 |    73.49 |   90.57 |   93.69 |                                                                            
  filesystem.js               |   91.36 |    73.49 |   90.57 |   93.69 | 21,30,62,63,129,164,218,219,240,275,368,467,489                            
------------------------------|---------|----------|---------|---------|----------------------------------------------------------------------------

I would like to submit further pull requests with even more test coverage, and this would be a helpful tool.

[kherock]

@kkoskelin thanks for putting this together, it's definitely needed. Those numbers are better than I was expecting!

@jamhall while I have your attention, could you install codecov to this repo when you have time? I don't think it needs additional setup for collaborator access, and open source licenses are free. Thanks!

[jamhall]

@kherock - I have activated codecov. Not too sure what I need to do now? I have a token... I guess you'll need this token once GH actions has been setup?

[fishcharlie]

Looks like there are merge conflicts. But other than that, this looks like a great PR!

[fishcharlie]

Codecov does have a GitHub action. I don't think that needs to be included in this PR and can be included in a separate PR once we get GitHub actions support up and running.

[kherock]

This is now in the main branch via #681, closing.