KARMA ANGULAR unit test example (link)

https://www.airpair.com/angularjs/posts/testing-angular-with-karma

http://www.bradoncode.com/blog/2015/02/27/karma-tutorial/

KARMA + JASMINE tutorial for testing

http://www.bradoncode.com/blog/2015/02/27/karma-tutorial/

D3 Karma Jasmine testing

http://busypeoples.github.io/post/testing-d3-with-jasmine/

JavaScript Karma Jasmine - JSON parsing tests

http://stackoverflow.com/questions/20938320/loading-external-file-from-karma-jasmine-test
http://stackoverflow.com/questions/25035688/json-parse-fails-in-jasmine

JavaScript - testing tools: Jasmine (BDD), JsUnit, Karma (test runner)

1. Jasmine http://jasmine.github.io/ is the priority for testing, due to its BDD approach. 
2. JsUnit is an option (w/o BDD):http://www.jsunit.net/
3. Karma http://karma-runner.github.io/0.12/index.html - it is JavaScript test runner.