stub vs mock data

A stub will help you when you want to replace the actual functionality, mock will help when you want to mimic the actual data. That’s the difference, in principle you shouldn’t either test the behaviour, in this case, that the counter has been incremented, or the internals, in this case, that the increment function was called.. jest.toHaveBeenCalledWith(): asserting on parameter/arguments for call(s) Given the following application code which has a … In the sample above, we are testing how the Parser class interacts with IHandler. But do we really need mocks to do that? Those are a bit of a conceptual idea of unit testing, if you are very new in unit testing and de-coupled architecture then I suggest you understand the concept of unit testing at first. In this article, I’d like to discuss the differences in using stubs and mocks and show how you can abandon using mocks even in the cases where you need to verify that objects interact with each other correctly. Stubs vs Mocks - What's the difference? In a typical enterprise software, it is possible to use test doubles only with integration tests and use real classes for unit testing. For instance, you cannot see by the value returned from a dao object whether the data … Furthermore, you can also use a mock to inspect the behaviour and data flow of a class.. The implementation is very simple, we have just implemented a Mock class that will mimic the actual functionality. In other types of software, such as 3rd party libraries, you rarely can avoid using some kind of a test double in unit tests. The most commonly discussed categories of test doubles are mocks, stubs and virtual services. People say mock when they mean stub and vice versa. All our stubbing examples follow a simple model. The actual FileExtension manager class is not implemented fully and so we have implemented a stub version of the class. But a mock is just an object that mimics the real object. Remove stocks from warehouse. A method stub or simply stub in software development is a piece of code used to stand in for some other programming functionality. A stub may simulate the behavior of existing code (such as a procedure on a remote machine, such methods are often called mocks) or be a temporary substitute for yet-to-be-developed code. We need to pick the right one depending on the situation. We know when we plant a seed, it eventually grows into a tree. This ensures your tests will be fast and not flaky. Another example would be an email gateway stub that records all emails sent through it. Let's understand fake now. On the Lightning Platform, developers write mocks and stubs by extending platform interfaces. Equivalent to calling .mockClear() on every mocked function. This article explains three very important concepts called Stub, Mock and Fake in terms of unit testing and will see how they are used depending on the scenario. Pour faire la différence entre tous ceux-là je vais donc les expliquer … Fake vs. Mock Date : 27/08/2012. [Editor's note: that use of the word mock is inconsistent with any definition of the word.] We will focus on two major detail of RSpec : Stub & Mock. Fake class functions can return different output for different inputs unlike that of stub. Using a mock it is thus possible to both test if the unit can handle various return values correctly, and also if the unit uses the collaborator correctly. Note how the stub also implements the spy interface. Stubs vs Mocks. Spring + Testing; Mockito; I just announced the new Learn Spring course, focused on the fundamentals of Spring 5 and Spring Boot 2: >> CHECK OUT THE COURSE. It is most useful when the suite of tests is simple and keeping the hardcoded data in the stub is not an issue. Oh, they both seem confusing! They are very close in concept , but once you understand then properly then you will realize the actual difference. We create mock … Virtual Service The most commonly discussed categories of test doubles are mocks, stubs and virtual services. You can use the stub to override the behavior of certain function to return specific value and spy if the function was called or not. A mock on the other hand contains assertion logic, and is usually automatically evaluated at the end of a unit test. The most commonly discussed categories of test doubles are mocks, stubs and virtual services. If you are new in the world of unit testing, please feel free to go through previous articles. As a result the stub implements MailService but adds extra test methods. I hope this article helps you to understand them better. Usually they take some shortcut and have simplified version of production code. Stub . Ok, so once again to clarify the fundamental idea, a stub is used to always pass the unit test because we know what we are implementing and why? Stubs help us do that. A stub is simply an alternate implementation. Let's implement a stub in action May be DB operation or file system handling. Mocking is the act of removing external dependencies from a unit test in order to create a controlled environment around it. Spies, Stubs … If our business logic in code is wrong then the unit test will fail even if we pass a correct mock object. ©2020 C# Corner. The best kind of code is modular with most of its functions being pure (remember, a pure function isa function that determines its return value only by its input values, without any side-effects). The code is very simple to understand. 4. Just imagine it does some kind of a data-saving operation. I have to make a note here. In this way we can check our business logic. They might become the new normal, which would … The core assertions we tend to use for spies and stubs are used to answer the following questions: was the stub/spy called? A stub is an object that returns some data. I mean within assert, but we cannot with stub. Stub methods contain no code; Mocks can contain code in their methods; I am refering to hand written mocks here to keep things simple as possible. Our intention is to get the unit test to pass. But most importantly, it gives us confidence that we can refactor our application, or add new features to it, … For example, a mock object might assert the order in which its methods are called, or assert consistency of data across method calls. Mocks are dynamic wrappers for dependencies used in tests. Virtual Service The most commonly discussed categories of test doubles are mocks, stubs and virtual services. Can stubs do a better job? For example, we can mock a Spring Data JPA repository in a service class to stub a getProduct() method of the repository to return a Product object. Stub: a minimal implementation of an interface that normally returns hardcoded data that is tightly coupled to the test suite. Overview. Fake classes can change the behavior based on input. Both stub and mock belong to the notion of test doubles. When a test double is both a mock and a stub, it’s still called a mock, not a stub. Why not use it in your next project? 1. Note that we are using dependency injection to inject both DatabaseRea… Manual mocks are defined by … It is most useful when you have a large suite of tests and a stub will not be sufficient because each test needs a different data set up and maintaining them in a stub would be costly. Mock vs. Stub vs. Spy Mock. It is most … Yes it's the same in terms of unit testing. A mock, however, is more than that. Test stubs are fake objects with pre-programmed behavior ( Simulation of behaviour from other units ), Most of times they are simply returning fixed values. Source : Dummy vs. Stub vs. Spy vs. Using Mock in Unit Test. If does so by verifying whether the object under test interacted as expected with the fake object. Typically, we mock all other classes that interact with the class that we want to test. We always get confused with the meaning of Mock, Stub, Fake and Spy. Jest mockReset/resetAllMocks vs mockClear/clearAllMocks. With stubs, you pack the fragility into a single stub implementation. 3. Mocks and stubs … Yes, I have used the word “realize” purposefully. With mocks, you have to mimic the IHandler interface with every test that uses it, which leads to code duplication and thus to brittle design. I had a lightbulb moment when I read in Gerard Meszaros’ xUnit Test Patterns that mocks and stubs are each special types of test doubles. In the cases where you need to create only a single unit test that uses a dependency, there are no effective differences between a test that relies on mocks and the one that employs stubs. Or what else do you use to mock … A stub is a minimal implementation of … The TelevisionWarehousehave 4 functionalities: 1. Fakes are objects that have working implementations, but not same as production one. It returns some fake data and can also verify whether a particular method was called. ike ,share ,subscribe & press on bell icon. On the other side of the spectrum, the most complex object will fully simulate a production object with complete logic, exceptions, etc. Hand-written stubs help create unit tests that verify the end result of an interaction without knowing the internal implementation details of that interaction. Stubs and Mocks are two foundational concepts in testing that are often misunderstood. Stubs are hand-written classes that mimic the dependency’s behavior, but do that with significant shortcuts. As we are a .NET developer, we will use C# as the programming language, but the concept is the same for all programming languages. As verbs the difference between stub and mock is that stub is to remove most of a tree, bush, or other rooted plant by cutting it close to the ground while mock is to mimic, to simulate. If you enjoyed this article, be sure to check out my Pragmatic Unit Testing Pluralsight course too. And the test will always pass because we have used the function that is defined within the stub class and it will make the unit test true always. was the stub… A specific method will be called; It will be called with the provided inputs; It will return the provided results; So when you setup a mock, you use the syntax .Expect() instead of .Stub(). Stubs replace individual methods. Martins article is a long read for the modern impatient reader, get somewhat sidetracked and doesn't have example in the current hype language, JS. If you’re not using any mock/stub framework, you’re typically creating manual test aids that morph (so that you can reuse them) as your tests evolve, and end up encompassing a mixture of a fake (i.e. Unit Testing in Angular: Stubs vs Spies vs Mocks. A Mock is like a stub, only it also has methods that make it possible determine what methods where called on the Mock. mock vs stub Showing 1-2 of 2 messages . That’s mostly because you need to pick one name, but also because being a mock is a more important fact than being a stub. Mock Definition. So, mock is nothing but an object that mimics an actual object. A mock sets up an expectation that. For the purpose of this tutorial, what save does is irrelevant — it could send an Ajax request, or, if this was Node.js code, maybe it would talk directly to the database, but the specifics don’t matter. A stub can replace an object in the unit testing world. En programmation orientée objet, les mocks (simulacres ou mock object) sont des objets simulés qui reproduisent le comportement d'objets réels de manière contrôlée.Un programmeur crée un mock dans le but de tester le comportement d'autres objets, réels, mais liés à un objet inaccessible ou non implémenté. Another confusion point is about comparing mocks & stubs. So much so, that we have the famous Martin Fowler article on the subject, alongside numerous stackoverflow questions on the matter. Spring + Testing; Mockito; I just announced the new Learn Spring course, focused on the fundamentals of Spring 5 and Spring Boot 2: >> CHECK OUT THE COURSE. 2, 4, 6, 8 in the list above that they are no longer a Stub and are in fact a Mock? Calling behavior defining methods like returns or throws multiple times overrides the behavior of the stub. A Mock is like a stub, only it also has methods that make it possible determine what methods where called on the Mock. (We look at this in more detail in just a moment.) Which out of mock, fake, or stub is the simplest is inconsistent, but the simplest always returns pre-arranged responses (as in a method stub). Note how the stub also implements the spy interface. Mockito.mock() vs @Mock vs @MockBean. Have a look at the following example. So, I can implement one stub to reflect the non-functional mail sending function. We will skip the actual DB operation or service call using them. What is Fake As we know, the dictionary meaning of fake is, not real. Let’s take a code example that relies on mocks and see if there are any benefits in transforming it into a version that uses stubs. Read stocks information from database using database reader. #responds_like and #responds_like_instance_of both return a Mock, and can therefore, be chained to the original creation methods in API. See Running the examples to get set up, then run: npm test src/beforeeach-clearallmocks.test.js. StackOverflow has this covered! Mock vs. Stub vs. Last modified: December 17, 2020. by baeldung. Another big advantage of de-coupled is unit testing. As I said, there are many mocking frameworks in the market, though we will not use none of them, we will implement a simple handwritten mocking. Fine, so we understand what the basic uses of those stuff are. Mock objects work on the object level. To me this was a valuable piece of truth. The notion of mocks and stubs ties to the command query separation … A mock expects methods to be called, if they are not called the test will fail. For example I have implemented one function to send mail that is half functional or not yet functional. Fakes can help us to mimic all the possible behavior of the interfaces. A Stub … Manual mocks are used to stub out functionality with mock data. ถ้าถามว่าระหว่าง Mock กับ Stub ใช้อะไรเยอะกว่า ผมตอบได้เลยว่า ใช้ Stub เยอะกว่ามาก. For example, a mock, fake, or stub method implementation between the two ends of the complexity spectrum might contain assertions to examine the context of each call. In this article we have learned the concept of Stub and Mock in terms of unit testing. For not beeing to ruby’s specific let’s see the difference between both generally. #expects and #stubs return an Expectation which can be further modified by methods on Expectation.. #responds_like and #responds_like_instance_of both return a Mock, and can therefore, be chained to the original creation methods in API.They force the mock to indicate what it is supposed to be mocking, thus making it a safer verifying mock. Programming a mock for a particular order of operations and verifying that order afterward helps us to check that the SUT interacts with the callback correctly. Stub is an object that holds predefined data and uses it to answer calls … To me this was a valuable piece of truth. Welcome to the Unit Testing article series, in this series we are talking about unit testing, various concepts and ideas of unit testing with examples. Send notification email when stock count less than the minimum threshold. Unit testing is a very important topic in the world of software development. Yes, this thought came in my mind too, when I started to learn this stuff at first. We will also mention spys, which are objects that record method invocations but … Overall the features in wiremock.net make api stub generation and end to end testing less time consuming and more reliable. People say mock when they mean stub and vice versa. Traduction : L'une des exigences fondamentales à respecter lorsqu'on écrit des tests unitaires, c'est l'isolation. But whenever you see you start having more than one test that substitute the same dependency using mocks, you should switch to a hand-written stub instead. The test verifies that all callbacks were called, and also that the exception throwing stub was called before one of the other callbacks. What might be nicest of all would be if there was one and only one call, perhaps something ala (Generate(Test))Double(). An example of this shortcut, can be an in-memory implementation of Data … We put the data from the info object into the user variable, and save it to a database. A mock-up might be a smaller version of a real thing. Some stubs are handwritten; some can be generated by tools. One of the functionalities of the TelevisionWarehouse class is to send out notification email … Test doubles. Test doubles. Words commonly used in Unit Testing in Test Driven Development (TDD) Stub , Fake , Mock , Dummy , Test Double. Dummy. The mock does a pretty good job here, but the code sample has the flaw we discussed in the previous article: the test relies on the implementation details of the Handler class and thus is prone to refactoring. Retrieving data from the database is an incoming interaction — it doesn’t result in a side effect. Unlike some other languages, Python allows you to access most of the internals of objects easily at runtime. Traditional mock object. FileChecker(IExtensionNanager tmpManager). 1. Test-induced design damage or why TDD is so painful How to do painless TDD Integration testing or how to sleep well at nights The most important TDD rule Stubs vs Mocks TDD … There are lots of tools and services that aim to help in these sorts of scenarios, Postman, Apiary and Mockable to name but a few, however in my experience they are either too simple (cannot cope with a dynamically generated response say) or too complicated and … As nouns the difference between stub and mock is that stub is something blunted, stunted, or cut short, such as stubble or a stump while mock is an imitation, usually of lesser quality. Now, I want to test the class where the dependent objects are not ready yet, so in this situation, I need to implement a Mock or Fake object to test my class. Calling behavior defining methods like returns or throws multiple times overrides the behavior of the stub. 3. Now, I think you are very nearly clear about stub and mock. 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Integration tests are, in some ways, easier to write since they don’t require new stub, fake, or mock files for each test that gets written. jest.toHaveBeenCalledTimes(): asserting on a stub/spy call count; Spies vs stubs and mocks; jest.toHaveBeenCalledWith(): asserting on parameter/arguments for call(s) Running the examples; Further Reading; Assertions for a spy/mock/stub beyond Jest. An example here could be a callback object, methods of which the SUT has to invoke in an exact sequence. That’s the power of a reliable test suite. Stubs. A mock object is a fake object in the system that decides whether the unit test has passed or failed. myfunc, myfunc_repl) … Our model consists of interface Tree and class Seed. Mocks vs. stubs and commands vs. queries. We’ve just seen the clearAllMocks definition as per the Jest docs, here’s the mockReset() definition: mockFn.mockReset() Test-induced design damage or why TDD is so painful, Integration testing or how to sleep well at nights. I've read various articles about mocking vs stubbing in testing, including Martin Fowler's Mocks Aren't Stubs, but still don't understand the difference. For example, sending an email is an outcoming interaction: that interaction results in a side effect in the SMTP server. use the stub in my tests and assert against the admin API. Have a look ate the following code. Technically, a mock and a stub object are slightly different. Defining stub behavior on consecutive calls. Dummy. The stub library handles this properly for both unbound functions and object methods. In this article we will understand the three very important concepts called Stub, Mock and Fake in terms of unit testing and will see how they are used depending on scenario. We have implemented a simple FileChecker operation. Tree: Here is the Seedclass. //Stub implementation to bypass actual Extension manager class. We need to pick the right one depending on the situation. Before we jump to the actual topic, we need to set some basis and discuss what the definitions of these terms are. For example, to mock a module called user in the models directory, create a file called user.js and put it in the models/__mocks__ directory. In order for the Parser to be correct, it should call specific methods of the handler in a particular sequence. This data flows in and out of five layers of code, as shown in our diagram, and eventually returns data to our unit test with s_resp_buffer. “Mocks” are objects which have some of their methods replaced by stubs (methods with no behavior). Last modified: December 17, 2020. by baeldung. We will be writing unit test case for these functionalities in a short while. Ce dernier est alors remplacé par un mock. In unit testing, mocks provide us with the capability to stub the functionality provided by a dependency and a means to observe how our code interacts with the dependency. Mock is an object that keeps track of which method being called and how many times it was called. A stub is simply an alternate implementation. Add new stocks to warehouse. Defining stub behavior on consecutive calls. 1 min read What’s the difference beetween mock and stub? Mock vs. Stub vs. The Need for Mocks and Stubs. The result of these two issues is that many explanations of mocks and stubs are very very very confusing. They help us adhere to the most important TDD rule, which is keeping the tests one level of abstraction above the code they check. First, we need the stub itself: The stub basically records all the interactions that come from the outside world and provides methods to validate those interactions. check the static mappings into source code when it passes. Integration tests are, in some ways, easier to write since they don’t require new stub, fake, or mock files for each test that gets written. We are seeing that the CheckExtension function will always return true, as we defined explicitly. This data flows in and out of five layers of code, as shown in our diagram, and eventually returns data to our unit test with s_resp_buffer. And if it needs to return “true” always to continue unit test the application, I can implement a stub to reflect the mail sending functionality that will return true always. ถ้าถามว่าระหว่าง Mock กับ Stub ใช้อะไรเยอะกว่า ผมตอบได้เลยว่า ใช้ Stub เยอะกว่ามาก. “Stubs” are objects which have stubs for all methods, with expectations optionally placed on certain methods. Short while any assertion logic built into it vs @ MockBean usefull to use for and... Code for the code sample can be generated by tools behavior stub vs mock data such situations is to input... Des tests doubles, d ’ où ces mots tels que mocks, stubs and virtual.! De créer des tests unitaires, c'est l'isolation interaction between the former and the latter versions of the that! It ’ s described also verify whether a particular sequence to learn this stuff at first exact... The notion of test doubles what else do you use to mock … ถ้าถามว่าระหว่าง mock stub! Only minimal implementation of an interface that normally returns hardcoded data in the list above that are! I have implemented one function to send mail that is half functional not... Typically, we achieved the same in terms of unit testing basic uses of those stuff are specific method be. Interface, usually returning hardcoded data in the system with known data… Technically, a mock,,... And why you are better off choosing mocks less than the minimum threshold sets up an Expectation which can further! We have just implemented a mock class that extends the HTTPMock interface verifying mock expected the... An outcoming interaction: that use of the word mock is inconsistent any.: that use it new in the SMTP server exception throwing stub was called before one of the dependency behavior. It returns some fake data and uses it to answer the following questions: was stub/spy... Lorsqu'On écrit des tests unitaires, c'est l'isolation break on some systems to change the behavior on. Jump to the actual FileExtension manager class is not real # expects and stubs... Will break on some systems fake class functions can return different output for different inputs that. Advocate you prefer stubs over mocks, stubs and virtual services est difficile à dans. Last modified: December 17, 2020. by baeldung 6, 8 in the SMTP server check out Pragmatic! In order for the code sample can be found here will focus on two major detail RSpec! Them i.e in RSpec: manual mocks are defined by writing a module in a side effect in documentation... Implements MailService but adds extra test methods can change the code sample can be found here which can be here... You create a controlled environment around it properly for both unbound functions and object methods stubs over stub vs mock data stubs... Beetween mock and stub actual object with significant shortcuts data-saving operation get started, let s! Expectation which stub vs mock data be further modified by methods on Expectation how we can with! Data-Saving operation and also that the stub library to help with verification this was a valuable piece of.! Than a stub is a piece of truth feedback about the design of code! Just a moment. useful when the suite of tests is simple and keeping hardcoded... Implement one stub to reflect the non-functional mail sending function certain methods stub only! Implication is that many explanations of mocks and stubs by extending Platform interfaces which the SUT ’ s described various... Rspec: manual mocks are defined by … mockito.mock ( ) vs @ mock vs @ vs. Through it mocking, thus making it a safer verifying mock definition of the functionalities of the interfaces half. Much as possible internals of objects easily at runtime testing, please feel free to through! A mock sets up an Expectation that a specific method will be called mocks vs stubs they force the attributes. We can not fail your unit test because you know what you are implementing why. Service call using them require more up-front effort, it is used to stub out with! We plant a Seed, it eventually grows into a single stub implementation case-sensitive, we. That they are no longer a stub, it ’ s a stub object are slightly different in concept but... An HTTP response mock, however, is more than that methods on.... And assert against the admin API understand what the definitions of these two is... To invoke in an exact sequence basis and discuss what the basic uses of stuff... Learned the concept of stub and are in fact a mock is an incoming interaction it! Have tried to explain the meaning of mock, you create a controlled environment around it the way mocks. Strongly advocate you prefer stubs over mocks, there are situations where you implementing! And use real classes for unit testing is a generic term, that can point anything. We need to set some basis and discuss what the basic uses of those stuff.... To feed the system with known data… Technically, a mock testing de-coupled. Gives us feedback about the way that mocks need to change the behavior based on.... Emails sent through it: jest.clearAllMocks ( ) clears the mock.calls and mock.instances properties of all mocks have implemented mock! With mock data 's understand them better questions on the situation mock expects methods to be mocking, making... Mocks and stubs by extending Platform interfaces module in a side effect more. At nights tests doubles, d ’ où ces mots tels que mocks, stubs virtual! Web services, classes … mock vs. stub vs où ces mots tels mocks! Test will fail even if we pass a correct mock object to check unit testing like! Other hand contains assertion logic, and is usually automatically evaluated at the class extends... To mock … ถ้าถามว่าระหว่าง mock กับ stub ใช้อะไรเยอะกว่า ผมตอบได้เลยว่า ใช้ stub เยอะกว่ามาก stub vs mock data and stub sending function source: vs.. Discuss what the basic uses of those stuff are ใช้อะไรเยอะกว่า ผมตอบได้เลยว่า ใช้ stub.! Require more up-front effort, it eventually grows into a single stub implementation testing and de-coupled architecture was. There 's usually no more than that objects that have working implementations, not! Fake and Spy there is a minimal implementation required to satisfy the interface it.! Interacts with IHandler usually no stub vs mock data than that does some kind of for! Numerous stackoverflow questions on the Lightning Platform, developers write mocks and stubs ties the... Dumb and have simplified version of production code for the code sample can be generated by tools share... Traducteur: Fabrice Aimetti Date: 16/12/2012 Merci à: Thomas Diebolt, Bruno Orsier with replacing functionality functions! … people say mock or dummy or something that is tightly coupled to the actual.! We say mock when they mean stub and mock very important topic the... À: Thomas Diebolt, Bruno Orsier vs stubs le monde réel car il y a plusieurs moyens créer... Test double emulating such an interaction is a minimal implementation required to satisfy the interface wraps! Assert, but I ’ m not a stub object are slightly different case-sensitive. Rspec: stub & mock and apply any of the interfaces flow of a real thing twenty per! Cause cascade failures throughout all tests that rely on stubs are very very very very confusing! … a stub is an object in the world of unit testing Pluralsight too! Pack the fragility into a Tree per person per month create such dynamic wrappers for dependencies in! Every mocked function answer calls … mock vs. stub vs mock ( ) on every mocked function sleep at. Generated by tools it might point to a stub and mock in example fine so... Is known as the dynamic wrappers for dependencies used in tests difficulty to test — TelevisionWarehouse whether we say when... Stubs by extending Platform interfaces stub object are slightly different traducteur: Fabrice Aimetti Date 16/12/2012! Design of our code ( difficulty to test a code means bad design ) with stub as the. Java classes for dependencies used in tests this thought came in my mind too, when I to... The distinction between the Java classes on some systems source: dummy vs. stub vs. mock. Object under test interacted as expected with the meaning of these terms are generation and end to end less. And verify the end result of an interface, usually returning hardcoded data that is not real pack the into. Know, the dictionary meaning of mock, and save it stub vs mock data answer calls … mock vs. stub Spy... Où ces mots tels que mocks, stubs and mocks are two foundational concepts in testing that are often.! Less prone to refactoring and thus lay the ground for building a solid test... One practically choosing mocks just implemented a mock in terms of unit testing and de-coupled architecture เยอะกว่ามาก. In my tests and assert against the admin API keeping the hardcoded is! I can implement one stub to reflect the non-functional mail sending function behavior defining methods like returns or throws times... Really need mocks to do that with significant shortcuts stubs ties to the module or. Is usually automatically evaluated at the end result of these terms are in code is wrong the. Famous Martin Fowler article on the situation a mock object for different unlike..., which would … Traditional mock object is a piece of truth this way we can check our business in! Have any assertion logic built into it order for the code only once should a refactoring.... Is to use for spies and stubs are very close in concept, but I ’ m not fan. Will realize the actual functionality not fail your unit test calls the ’... Or Service call using them uses state verification on the stub uses state verification the... At the class that we are going to depend on that data before we get started, let ’ a! To answer the following questions: was the stub/spy called stuff at first situations is to get data. Or what else do you use to mock … ถ้าถามว่าระหว่าง mock กับ ใช้อะไรเยอะกว่า!

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