Counsel

# Code coverage

In computer science, test coverage is a measure used to describe the degree to which the source code of a program is executed when a particular test suite runs. A program with high test coverage, measured as a percentage, has had more of it's source code executed during testing, which suggests it has a lower chance of containing undetected software bugs compared to a program with low test coverage.

  • Statement coverage: how many of the statements in the program have been executed.
  • Branches coverage: how many of the branches of the control structures (if statements for instance) have been executed.
  • Function coverage: how many of the functions defined have been called.
  • Line coverage: how many of lines of source code have been tested.

→ Source

$ counsel --coverage
Running test coverage tool Istanbul: https://istanbul.js.org/.

=============================== Coverage summary ===============================
Statements   : 84.5% ( 1287/1523 )
Branches     : 71.88% ( 409/569 )
Functions    : 85.89% ( 286/333 )
Lines        : 84.97% ( 1278/1504 )
================================================================================

Run code coverage with html output format:

$ counsel --coverage=html
Running test coverage tool Istanbul: https://istanbul.js.org/.
View results: file:///{project-root}/coverage/index.html

For all available type of coverage reports see https://github.com/istanbuljs/nyc#running-reports

# Integrate with Codecov

Codecov is a great tool to visualize your code coverage.

Add the following json into your package.json file:

"scripts": {
    "coverage": "counsel --coverage && nyc report --reporter=text-lcov > coverage.lcov && codecov"
},

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