14 July 2017
TIL: How to Correctly Use a Jasmine Spy
by Alex Heflin
At Gaslight we are all about continuously growing and learning, so we’re starting a “Today I Learned Series”! Stay tuned for more tidbits!
I often find myself stumped when trying to use spies in a JavaScript test… Until Today.
TIL: How to correctly use a Jasmine Spy:
Foo = require('foo')
describe 'Foo'
describe 'bar'
it 'does a thing'
spyOn(Foo, 'bar')
foo = new Foo()
expect(foo.bar).toHaveBeenCalled()
Run into no method error? Try spyOn(Foo.prototype, 'bar').
- Jasmine is a popular JavaScript testing framework
- Spies are a type of test double that allow you to stub functions and track the function call, and it’s arguments
For more information on Jasmine Spies, visit their documentation.
