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sinon vs rewire: when do I use which?
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Best Practices for Spies, Stubs and Mocks in Sinon.js
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I will give you a taste of the finer side of life with me. Gold Show. BBW nympho. ChristyOnDemand Love bring the joy by letting you feel me. Buzz toy works always. BratLollipop Searches Related to "sao sinon hentai".However I feel this would slow down the creative process massively. The function I was testing looks like this:. This function is essentially a control structure.
I have received some input from the client, and using that information I want to do A then B then C then D finally E to create the complex set of data structures that comprise a collection.
Problem encountered 1: How do I mock the dependencies? This was quite easy actually: Rewire enabled me to substitute collectionDAO for my own object like so:. Problem 2: createCollectionRecord needs to return a promise This was starting to look ugly. Ideally, instead of my own function I want to use something like a Sinon spy to work out if createCollectionRecord has been called.
However this function clearly returns a promise. Problem 2. Why so many? NPM is proliferating with lots of seemingly duplicate content, the subtle differences are a little lost on me. The test which implements the sinon-promise looks like this:. This really messed with me. It took me ages to firstly realise this was what I needed to do. The timeout was 2 seconds, I could have merely extended the timeout, but I think it was trying to do a round trip to the database, which is obviously not desired.
Eventually I remembered that console logs are actually emitted when the test is run, so I was able to debug the code and find out where it was timing out. The code which implements it looks like this:. The original code probably took me 30 minutes to write. The unit test, so far has taken me 4 days. I think I need to practice more. QlikView Scatterplot with dynamic relabelling.Testing code with Ajax, networking, timeouts, databases, or other dependencies can be difficult. For example, if you use Ajax or networking, you need to have a server, which responds to your requests.
With databases, you need to have a testing database set up with data for your tests. All of this means that writing and running tests is harder, because you need to do extra work to prepare and set up an environment where your tests can succeed. Thankfully, we can use Sinon. We can make use of its features to simplify the above cases into just a few lines of code. However, getting started with Sinon might be tricky. You get a lot of functionality in the form of what it calls spies, stubs and mocks, but it can be difficult to choose when to use what.
The function takes two parameters — an object with some data we want to save and a callback function. We put the data from the info object into the user variable, and save it to a database. For the purpose of this tutorial, what save does is irrelevant — it could send an Ajax request, or, if this was Node. Just imagine it does some kind of a data-saving operation. Together, spies, stubs and mocks are known as test doubles.
Similar to how stunt doubles do the dangerous work in movies, we use test doubles to replace troublemakers and make tests easier to write. To best understand when to use test-doubles, we need to understand the two different types of functions we can have. We can split functions into two categories:. Functions without side effects are simple: the result of such a function is only dependent on its parameters — the function always returns the same value given the same parameters.
A function with side effects can be defined as a function that depends on something external, such as the state of some object, the current time, a call to a database, or some other mechanism that holds some kind of state. The result of such a function can be affected by a variety of things in addition to its parameters.
If you look back at the example function, we call two functions in it — toLowerCaseand Database. The former has no side effects — the result of toLowerCase only depends on the value of the string.
However, the latter has a side effect — as previously mentioned, it does some kind of a save operation, so the result of Database. If we want to test setupNewUserwe may need to use a test-double on Database. In other words, we can say that we need test-doubles when the function has side effects. In addition to functions with side effects, we may occasionally need test doubles with functions that are causing problems in our tests.Tests are today an essencial part of the software development.
In Sinon spies can be created in some different ways, though for unit testing we will usually instance them in either one of these 2 ways:. It would be done in this way:. Every time a phone number is added, we validate it and if it is invalid we send a notification. So far, with spies we know how to check interactions with external dependencies, but we cannot modify how they work.
For that we have the stubs. We will be able to define a stub on either an anonymous function or on an existing object. Now we have a similar code but we also check if the phone is in a blacklist. That validation is done in an external service, so we will use a stub to cover the 2 different cases: be in the blacklist or not. In this way the stub should return true or false depending the test we are doing. As we did with the spies, stubs should be released with restore once they are not needed.
A mock is a mixture between a spy and a stub, so it implements the API of both of them. But what make mocks different is that we can establish expectations on them. These expectations will be checked at the end of the test and if the mock has not been used as expected our test will fail.
After that we will use the verify method to check if the mock was used in the right way. Mocks change a little bit the appearance of our tests, but the process keeps being more or less the same. For example, in the previous example for the stubs we could replace the stubs with mocks for blacklistService. In that mock we verify that that function was called with the right parameters i.
The resulting code would be:. We have seen 3 different elements which will be useful in our unit tests. Depending on the case we will have to use the one more suitable. It should be noted that in all our examples we have only tested the public methods of each module. We have not tested anything directly for the private ones.
We have done this like this, because we are following a pattern of black box, in which we only test our code based in the inputs it receives and the output it brings.
A good code designed with a good dependency injection would help us testing the code in an easy way.Despite all my efforts to try to encapsulate some of my code into my modules, I was always founding myself exposing too much just for unit testing purpose.
And even thought, it was often very complex to mock out some of the external libraries I was using. That was before I found the rewire library. As they say, it only: "adds a special setter and getter to modules so you can modify their behaviour for better unit testing". Setting up a mock is easy I use sinon but any mocking will do it :. The purpose of the blog is to teach how to do various tasks in node. This site is powered by Wheata git based blogging engine written in node.
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If your article passes the quality standards it will be published and help support the greater node community. Content and articles are copyrighted to the individual authors. All code snippets used in the examples are in the public domain.
The zen of coding in node. Mocking Dependencies using [rewire] Despite all my efforts to try to encapsulate some of my code into my modules, I was always founding myself exposing too much just for unit testing purpose. This is all you need! Let's see an example I have a very simple controller like this: user-controller. About HowToNode. Wheat v2 running on node.In node.
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Sinon allows you to monkey-patch functions, while rewire allows you to… monkey-patch functions. In short: if you are testing module A, and inside module A there is a call to a function of module B, you should use sinon. If you want to monkey-patch a call to a function inside module A itself, you should use rewire and optionally, sinon as well. This works, because in node. Therefore, sinon can overwrite the b. This function is not exported by a.
In your test file, you can now require '. This is not elegant at all. Fortunately, rewire allows us to overwrite even private functions. All you need to do in your test file is the following:. Joost's blog.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. First of all, I am using sinon's fakeTimers to create the right timed environment. The problem is, that sometimes applying the fake timer seems to fail when rewire is involved while in some other instances it's perfectly working. Now, as you can see, the second test fails. This is the test that is using the module as it's required on top of the script aka on the global scope.
So I suspect it's because how rewire works and due to when the fakeTimers get installed. Can anyone explain this in detail? Is there a way I can use inject-required modules with rewire on the global scope or do I always have to rewire them at the lower levels?Nightcore - Hallelujah (Switching Vocals) - (Lyrics) by sinon
Thus you are able to change global variables without affecting other modules. The downside is that changes to global properties will now be shadowed by the local variables.
Learn more. When using rewire and sinon fakeTimer, order matters? Ask Question. Asked 4 years, 2 months ago. Active 4 years ago. Viewed times. While testing a setup with a timed interval, I came across this problem. Please check out this setup: test. Are you aware that you are not resetting the clock after each test case? To do this you would need to use afterEach instead of after.
Jan 22 '16 at Active Oldest Votes.