Softwarequality

Ensuring Software Quality
Manual tests are time-consuming and error-prone
Range of automated tools available to help ensure quality is maintained
All tests are pass/fail
When running automated tests, a non-zero exit code means failure.

Script Aliases
Many commands require a path plus multiple parameters
Installed nodejs commands are in the node_modules/.bin directory
Avoid having to type these in full by creating  script aliases
These are stored in the scripts object in the package.json file.

Examples of Script Aliases
"scripts": {
   "test": "node_modules/.bin/jest --coverage",
   "watch": "node_modules/.bin/jest --coverage --watchAll"
 }

Running Code-Coverage as Pass/Fail
By default the jest code coverage tool returns 0 (pass)
To change this to a pass/fail test you need to tell it what the acceptable thresholds are
This should be added to the jest section in your package.json file.

Setting the Thresholds
"jest": {
   "testEnvironment": "node",
   "verbose": true,
   "coverageThreshold": {
     "global": {
       "branches": 100,
       "functions": 100,
       "lines": 100,
       "statements": -10
     }
   }
 }

Parser Options
specify the JavaScript language options you want to support (defaults to ECMA5)
"parserOptions": { "ecmaVersion": 6,"sourceType": "module",}