sinon stub class

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Expectations implement both the spies and stubs APIs. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. And I'm not aware of a way to stub the entire class (ie. //to stub someObject.aFunction...

element.setAttribute('data-id', id);

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callbacks were called, and also that the exception throwing stub was called We’ll occasionally send you account related emails.

Causes the stub to throw the argument at the provided index.


Granted, it still doesn't test the actual constructor, but I usually try to leave testing to code lines with a higher ROI . See also Asynchronous calls.

See also Asynchronous calls. In this Sinon tutorial, Jani Hartikainen demonstrates how to make unit testing non-trival JavaScript code trivial with the help of spies, stubs and mocks. However, as you already said, this function is in a local scope (probably defined within an object literal or a namespace). Doing it like you just said is something I sometimes do, as in this codebit I had lying around from a project a few years ago: By using an options argument, instead of relying on the positional arguments, it keeps flexible, but often I just export some factory methods to produce objects in various ways instead of, or (for convenience) in addition to, directly exposing the constructor. exception. I'm not sure if I should file this as a separate issue (since it's a different error than what @Spy-Seth reported), or if it should be part of this issue (since it's another problem with stubbing ES6 class constructors ... so I guess I'll post it here. Like yields, yieldsTo grabs the first matching argument, finds the callback and calls it with the (optional) arguments. Quick JavaScript testing tip: How to structure your tests?

nodejs run with the --harmony flag), not Babel ES6=>ES5 code. If you feel that your topic is an issue with Sinon.JS, please open a new ticket and follow the guidelines for reporting an issue. This is useful to be more expressive in your assertions, where you can access the spy with the same call. ES classes are sugar coated ES5 classes and can be stubbed in the same way using sinon.createStubInstance.

If you want to see if a function gets called, just supply a stub instead. Causes the stub to return promises using a specific Promise library instead of As of 1.8, this functionality has been removed in favor of the I think what you want is to investigate the sinon.createStubInstance method. an undefined value will be returned; starting from sinon@6.1.2, a TypeError querySelectorAll: sinon.stub() Thanks, so I came here in search of a solution to the OP's problem, which seems to be similar to the issue I'm having.

Async version of stub.callsArgOnWith(index, context, arg1, arg2, …). undefined for the property accessors.

Like above but with an additional parameter to pass the this context. Westy wants to stub a property, not a function. If a method accepts more than one callback, you need to use yieldsRight to call the last callback or callsArg to have the stub invoke other callbacks than the first or last one.

We’ll use DOM objects as a practical example, as they’re used quite often, and they can present several challenges when stubbing.

Causes the stub to return a Promise which resolves to the argument at the var parent = { and callsArg* family of methods define a sequence of behaviors for consecutive See the discussion above where I elaborate on this point. We use essential cookies to perform essential website functions, e.g. Useful for testing sequential interactions. Returns the stub Do you want the,,,, stub.callsArgOnWith(index, context, arg1, arg2, …), stub.yieldsToOn(property, context, [arg1, arg2, …]), In Node environment the callback is deferred with, In a browser the callback is deferred with. How on earth would you stub something like that?

For example, we used document.body.getElementsByTagName as an example above.

Like callsArg, but with arguments to pass to the callback.

first argument. It appears that ES6 class constructors cannot be changed after construction, and so calling spy/stub/whatever on them is a nonsense operation. As such, I believe Sinon should throw an error when you try to stub a constructor, rather than letting the user believe that the stub worked. Add a custom behavior. Invokes callbacks passed as a property of an object to the stub. Although we used DOM objects as an example here, you can apply these same methods to stub any kind of more complex object.

onCall can be combined with all of the behavior defining methods in this section. Just opening up a little bit for dependency injection is a pragmatic middle-way that does less magic IMHO, at the expense of a few lines.

overrides the behavior of the stub. By clicking “Sign up for GitHub”, you agree to our terms of service and

First, we create a test-double for the parent parameter. Since we need to verify the classList.add function is called, we add a classList property with an add stub function. Like yield, yieldTo grabs the first matching argument, finds the callback and calls it with the (optional) arguments. In this article, we’ll look at how to stub objects which are deeply nested, and when functions have more complex return values and they interact with other objects. With more complex fake objects like this, it’s easy to end up with messy tests with a lot of duplication. For latecomers these are the main points to take to heart: Successfully merging a pull request may close this issue., This has nothing to do with ES6 classes per se, and everything to do with understanding how javascript prototypes work (since forever). Dealing with complex objects in Sinon.js is not difficult, but requires you to apply different functionality together to make things work.

P.S. When constructing the Promise, sinon uses the Promise.reject method.

So, I guess I just have to weigh my distaste for, on the one hand, making test-only changes to non-test code vs. my desire to test whether new Foo() was called, on the other.

Sign in thrown.

See also Asynchronous calls. If you’ve used Sinon, you’ll know stubbing simple objects is easy (If not, check out my Sinon.js getting started article). In javascript everyone can have access to the global scope, but not the other way around.


It's conform me in the fact ES6 classes are not completely ready to be widely used: they can't be tested easily. We could’ve used an empty “normal” function too, but this way we can easily specify the behavior for setAttribute in our tests, and we can also do assertions against it.

We are trying to keep the GitHub issues list tidy and focused on bugs and feature discussions. var stub = sinon.stub(obj); Stubs all the object’s methods. Learn more.

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