javascript - How can you use Sinon (or something similar) to stub a method that's not on the relevant prototype? -


suppose create object using constructor:

function myconstructor() {   this.mymethod = () => console.log('foo'); }  const myobject = new myconstructor();

and in test file want stub mymethod method. if had defined mymethod on prototype, pretty straightforward. 1 use:

sinon.stub(myconstructor.prototype, 'mymethod')

but doesn't work when method defined in constructor using this, in example above.

this issue that's hard avoid because 3rd-party libraries define instance methods in way, i.e., within constructor instead of on prototype. , need way stub such methods when testing.


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