Chapter 2Executing a subset of tests
The Jasmine version shipped with Karma runner has very useful extensions to
quickly isolate a set of tests to run:
- Prefixing a test or a suite with the x character (xit, xdescribe) will disable
this tests/suite during the next run. - Prefix a test suite with the d character (ddescribe) will only run this suite,
ignoring others. - Prefixing a test with the i character (iit) will only run this test, ignoring
other tests and suites.
Those little prefixes are extremely useful in practice and can be used as shown below:
describe('tips & tricks', function () {xdescribe('none of the tests here will execute', function () {it('won't execute - spec level', function () {
});xit('won't execute - test level', function () {
});
});describe('suite with one test selected', function () {iit('will execute only this test', function () {
});it('will be executed only after removing iit', function () {
});
});});Debugging
Narrowing down a failing test is half of the success. Still we need to understand
what is going on, and this often involves a debugging session. But how to debug
tests executed by Karma runner? It turns out that it is pretty easy; it is enough to add
the debugger statement in our test or production code.