• Differences Between Pc And Mac
• Difference Between Stub And Driver

Stub is a piece of code emulating a called function, a driver is a piece of code emulating a calling function. Stubs are created integration testing like Top-down approach, Drivers are created integration testing like bottom-up approach.

• What is the difference between stubs and drivers?? It is always a good idea to develop and test software in 'pieces'. But, it may seem impossible because it is hard to imagine how you can test one 'piece' if the other 'pieces' that it uses have not yet been developed (and vice versa).
• What is the difference between stub and driver? Drivers are also used when the software needs to interact with an external system and are usually complex than stubs.

While doing an Integration , If we dont have all the modules getready and Need to test a particualr module which is ready then WeUse Stubs and Drivers. Stubs and drivers used in Integrationtesting for a Top Down Integration testing and Botton UpIntegration Testing. For EX : If we have Modules x,y,z . X moduleis ready and Need to Test it , But i calls functions from y andz.(Which is not ready)To test at a particular module we write aSmall Dummy piece a code which Simulates Y and Z Whch will returnvalues for X, These pice of Dummy code is Called Stubs in a TopDown Integration So Stubs are called Functions in Top DownIntegration. Similar to the above ex: If we have Y and Z modulesget ready and x module is not ready, and we need to test y and zmodules Which return values from X,So to get the values from X Wewrite a Small Pice of Dummy code for x which returns values for Yand Z,So these piece of code is called Drivers in Botton UpIntegration So Drivers are calling Functions in Bottom UpInegration. Thanks Sandhya

What is a driver in software testing?

While integrating sub-modules in Bottom-Up approach, if at all a mandatory module is missing then that missing module will be replaced by a temporary program. This program is called Driver in Software Testing. Drivers are used during Bottom-up integration testing in order to simulate the behaviour of the upper level modules that are not yet integrated.Drivers are the modules that act as temporary replacement for a calling module and give the same output as that…

What is the disadvantages and advantages of SAP implementation with SAP and stubs drivers?

This is very dynamic software. but the problem is what when you dont have your net connection you cannot use this.

What is difference between static vs dynamic testing?

Static vs. dynamic testing Software testing is an investing conducted provides stockholders with information about the quality of product or service under test. Software testing can also provide an objective, view of the software to allow the business to appreciate and understand the risk of software implantation. Test techniques include, but are not limited to the process of executing a program or application with the intent of finding software bugs. There are large number of…

What is stub and driver in software testing with example?

Stubs are dummy modules that are always distinguished as 'called programs', or you can say that is handle in integration testing (top down approach), it used when sub programs are under construction. Stubs are considered as the dummy modules that always simulate the low level modules. Drivers are also considered as the form of dummy modules which are always distinguished as 'calling programs', that is handled in bottom up integration testing, it is only used…

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ISTQB Software Testing Certification is the toughest software testing certificatiion

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Program is a part of software and is compiled by compiler. Combining several programs a complete software is formed. Testing that complete software is called software testing.

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Integration testing is a typically incremental process which involves testing whether individual modules within a system interact correctly. Top-down Integration Testing Top-down integration testing involves starting at the top of a system hierarchy at the user interface and using stubs to test from the top down until the entire system has been implemented. There is no need for test drivers as the user interface provides the means to enter test data. Using Top-down integration testing…

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Software Testing Testing with a Purpose Software testing is performed to verify that the completed software package functions according to the expectations defined by the requirements/specifications. The overall objective to not to find every software bug that exists, but to uncover situations that could negatively impact the customer, usability, and/or maintainability. From the module level to the application level, this article defines the different types of testing. Depending upon the purpose for testing and the…

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Software Testing involves verification and validation. It is important in software development life cycle so that the product formed is free from bugs.

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.

MattSayarnever_had_a_namenever_had_a_name

37 Answers

Stub

I believe the biggest distinction is that a stub you have already written with predetermined behavior. So you would have a class that implements the dependency (abstract class or interface most likely) you are faking for testing purposes and the methods would just be stubbed out with set responses. They would not do anything fancy and you would have already written the stubbed code for it outside of your test.

Mock

A mock is something that as part of your test you have to setup with your expectations. A mock is not setup in a predetermined way so you have code that does it in your test. Mocks in a way are determined at runtime since the code that sets the expectations has to run before they do anything.

Difference between Mocks and Stubs

Tests written with mocks usually follow an initialize -> set expectations -> exercise -> verify pattern to testing. While the pre-written stub would follow an initialize -> exercise -> verify.

Similarity between Mocks and Stubs

The purpose of both is to eliminate testing all the dependencies of a class or function so your tests are more focused and simpler in what they are trying to prove.

HarrisSean CopenhaverSean Copenhaver

Foreword

There are several definitions of objects, that are not real. The general term is test double. This term encompasses: dummy, fake, stub, mock.

Reference

According to Martin Fowler's article:

• Dummy objects are passed around but never actually used. Usually they are just used to fill parameter lists.
• Fake objects actually have working implementations, but usually take some shortcut which makes them not suitable for production (an in memory database is a good example).
• Stubs provide canned answers to calls made during the test, usually not responding at all to anything outside what's programmed in for the test. Stubs may also record information about calls, such as an email gateway stub that remembers the messages it 'sent', or maybe only how many messages it 'sent'.
• Mocks are what we are talking about here: objects pre-programmed with expectations which form a specification of the calls they are expected to receive.

Style

Mocks vs Stubs = Behavioral testing vs State testing

Principle

According to the principle of Test only one thing per test, there may be several stubs in one test, but generally there is only one mock.

Lifecycle

Test lifecycle with stubs:

1. Setup - Prepare object that is being tested and its stubs collaborators.
2. Exercise - Test the functionality.
3. Verify state - Use asserts to check object's state.
4. Teardown - Clean up resources.

Test lifecycle with mocks:

1. Setup data - Prepare object that is being tested.
2. Setup expectations - Prepare expectations in mock that is being used by primary object.
3. Exercise - Test the functionality.
4. Verify expectations - Verify that correct methods has been invoked in mock.
5. Verify state - Use asserts to check object's state.
6. Teardown - Clean up resources.

Summary

Both mocks and stubs testing give an answer for the question: What is the result?

Testing with mocks are also interested in: How the result has been achieved?

Ryszard DżeganRyszard Dżegan

A stub is a simple fake object. It just makes sure test runs smoothly.
A mock is a smarter stub. You verify your test passes through it.

Arnis LapsaArnis Lapsa

Here's a description of each one followed by with real world sample.

• Dummy - just bogus values to satisfy the API.

  Example: If you're testing a method of a class which requires many mandatory parameters in a constructor which have no effect on your test, then you may create dummy objects for the purpose of creating new instances of a class.

• Fake - create a test implementation of a class which may have a dependency on some external infrastructure. (It's good practice that your unit test does NOT actually interact with external infrastructure.)

  Example: Create fake implementation for accessing a database, replace it with in-memory collection.

• Stub - override methods to return hard-coded values, also referred to as state-based.

  Example: Your test class depends on a method Calculate() taking 5 minutes to complete. Rather than wait for 5 minutes you can replace its real implementation with stub that returns hard-coded values; taking only a small fraction of the time.

• Mock - very similar to Stub but interaction-based rather than state-based. This means you don't expect from Mock to return some value, but to assume that specific order of method calls are made.

  Example: You're testing a user registration class. After calling Save, it should call SendConfirmationEmail.

Stubs and Mocks are actually sub types of Mock, both swap real implementation with test implementation, but for different, specific reasons.

LevLev

In the codeschool.com course, Rails Testing for Zombies, they give this definition of the terms:

Stub

For replacing a method with code that returns a specified result.

Mock

A stub with an assertion that the method gets called.

So as Sean Copenhaver described in his answer, the difference is that mocks set expectations (i.e. make assertions, about whether or how they get called).

Dillon KearnsDillon Kearnsmk_mk_

I think the simplest and clearer answer about this question is given from Roy Osherove in his book The art of Unit Testing (page 85)

The easiest way to tell we’re dealing with a stub is to notice that the stub can never fail the test. The asserts the test uses are always against the class under test.

On the other hand, the test will use a mock object to verify whether the test failed or not. [..]

Again, the mock object is the object we use to see if the test failed or not.

That means if you are making assertions against the fake it means you are using the fake as a mock, if you are using the fake only to run the test without assertion over it you are using the fake as a stub.

olibre

Reading all the explanations above, let me try to condense:

• Stub: a dummy piece of code that lets the test run, but you don't care what happens to it.
• Mock: a dummy piece of code, that you VERIFY is called correctly as part of the test.
• Spy: a dummy piece of code, that intercepts some calls to a real piece of code, allowing you to verify calls without replacing the entire original object.

A Mock is just testing behaviour, making sure certain methods are called.A Stub is a testable version (per se) of a particular object.

What do you mean an Apple way?

roufamaticNebulaFoxNebulaFox

If you compare it to debugging:

Stub is like making sure a method returns the correct value

Mock is like actually stepping into the method and making sure everything inside is correct before returning the correct value.

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happygilmorehappygilmore

I think the most important difference between them is their intentions.

Let me try to explain it in WHY stub vs. WHY mock

Suppose I'm writing test code for my mac twitter client's public timeline controller

Here is test sample code

• STUB: The network connection to twitter API is very slow, which make my test slow. I know it will return timelines, so I made a stub simulating HTTP twitter API, so that my test will run it very fast, and I can running the test even I'm offline.
• MOCK: I haven't written any of my UI methods yet, and I'm not sure what methods I need to write for my ui object. I hope to know how my controller will collaborate with my ui object by writing the test code.

By writing mock, you discover the objects collaboration relationship by verifying the expectation are met, while stub only simulate the object's behavior.

I suggest to read this article if you're trying to know more about mocks: http://jmock.org/oopsla2004.pdf

Adam Parkin

To be very clear and practical:

Stub: A class or object that implements the methods of the class/object to be faked and returns always what you want.

Example in JavaScript:

Mock: The same of stub, but it adds some logic that 'verifies' when a method is called so you can be sure some implementation is calling that method.

As @mLevan says imagine as an example that you're testing a user registration class. After calling Save, it should call SendConfirmationEmail.

A very stupid code Example:

R01010010R01010010

Using a mental model really helped me understand this, rather than all of the explanations and articles, that didn't quite 'sink in'.

Imagine your kid has a glass plate on the table and he starts playing with it. Now, you're afraid it will break. So, you give him a plastic plate instead. That would be a Mock (same behavior, same interface, 'softer' implementation).

Now, say you don't have the plastic replacement, so you explain 'If you continue playing with it, it will break!'. That's a Stub, you provided a predefined state in advance.

A Dummy would be the fork he didn't even use.. and a Spy could be something like providing the same explanation you already used that worked.

HarrisMoshishoMoshisho

This slide explain the main differences very good.

*From CSE 403 Lecture 16 , University of Washington (slide created by 'Marty Stepp')

Aviram FirebergerAviram Fireberger

I like the explanantion put out by Roy Osherove [video link].

Every class or object created is a Fake. It is a Mock if you verify calls against it. Otherwise its a stub.

nitishagarnitishagar

• Stubs vs. Mocks
  • Stubs
    1. provide specific answers to methods calls
       • ex: myStubbedService.getValues() just return a String needed by the code under test
    2. used by code under test to isolate it
    3. cannot fail test
       • ex: myStubbedService.getValues() just returns the stubbed value
    4. often implement abstract methods
  • Mocks
    1. 'superset' of stubs; can assert that certain methods are called
       • ex: verify that myMockedService.getValues() is called only once
    2. used to test behaviour of code under test
    3. can fail test
       • ex: verify that myMockedService.getValues() was called once; verification fails, because myMockedService.getValues() was not called by my tested code
    4. often mocks interfaces

Relu MesarosRelu Mesaros

A fake is a generic term that can be used to describe either a stubor a mock object (handwritten or otherwise), because they both look like thereal object.

Whether a fake is a stub or a mock depends on how it’s used inthe current test. If it’s used to check an interaction (asserted against), it’s amock object. Otherwise, it’s a stub.

Fakes makes sure test runs smoothly. It means that reader of your future test will understand what will be the behavior of the fake object, without needing to read its source code (without needing to depend on external resource).

What does test run smoothly mean?
Forexample in below code:

You want to test mailService.SendEMail() method, to do that you need to simulate an Exception in you test method, so you just need to create a Fake Stub errorService class to simulate that result, then your test code will be able to test mailService.SendEMail() method. As you see you need to simulate a result which is from an another External Dependency ErrorService class.

Mustafa EkiciMustafa Ekici

let see Test Doubles:

• Fake: Fakes are objects that have working implementations, but not the same as production one. Such as: in-memory implementation of Data Access Object or Repository.

• Stub: Stub is an object that holds predefined data and uses it to answer calls during tests. Such as: an object that needs to grab some data from the database to respond to a method call.

• Mocks: Mocks are objects that register calls they receive.In test assertion, we can verify on Mocks that all expected actions were performed. Such as: a functionality that calls e-mail sending service.for more just check this.

Alireza Rahmani KhaliliAlireza Rahmani Khalili

Right from the paper Mock Roles, not Objects, by the developers of jMock :

Stubs are dummy implementations of production code that return canned results. Mock Objects act as stubs, but also include assertions to instrument the interactions of the target object with its neighbours.

So, the main differences are:

• expectations set on stubs are usually generic, while expectations set on mocks can be more 'clever' (e.g. return this on the first call, this on the second etc.).
• stubs are mainly used to setup indirect inputs of the SUT, while mocks can be used to test both indirect inputs and indirect outputs of the SUT.

To sum up, while also trying to disperse the confusion from Fowler's article title: mocks are stubs, but they are not only stubs.

I came across this interesting article by UncleBob The Little Mocker. It explains all the terminology in a very easy to understand manner, so its useful for beginners. Martin Fowlers article is a hard read especially for beginners like me.

A.IA.I

See below example of mocks vs stubs using C# and Moq framework. Moq doesn't have a special keyword for Stub but you can use Mock object to create stubs too.

Adarsh ShahAdarsh Shah

Stub and Mock testing point of view:

• Stub is dummy implementation done by user in static way mean i.e in Stub writing the implementation code. So it can not handle service definition and dynamic condition, Normally this is done in JUnit framework without using mocking framework.

• Mock is also dummy implementation but its implementation done dynamic way by using Mocking frameworks like Mockito. So we can handle condition and service definition as dynamic way i.e. mocks can be created dynamically from code at runtime. So using mock we can implement Stubs dynamically.

PremrajPremraj

Stub helps us to run test. How? It gives values which helps to run test. These values are itself not real and we created these values just to run the test. For example we create a HashMap to give us values which are similar to values in database table. So instead of directly interacting with database we interact with Hashmap.

Mock is an fake object which runs the test. where we put assert.

user965884user965884

Mockito example

Stub just returns canned data. Stubs are simple and straightforward — they’re essentially the simplest possible implementation of a method and return the same canned data every time. This gives us full control over returned values from methods that were invoke on the dependency.

Mock object provides a way to check if object under test has called certain methods.

And as Martin Fowler said in his essay

There is a difference in that the stub uses state verification while the mock uses behavior verification.

Read more here and here

yoAlex5yoAlex5

I have used python examples in my answer to illustrate the differences.

Stub - Stubbing is a software development technique used to implement methods of classes early in the development life-cycle. They are used commonly as placeholders for implementation of a known interface, where the interface is finalized or known but the implementation is not yet known or finalized. You begin with stubs, which simply means that you only write the definition of a function down and leave the actual code for later. The advantage is that you won't forget methods and you can continue to think about your design while seeing it in code. You can also have your stub return a static response so that the response can be used by other parts of your code immediately. Stub objects provide a valid response, but it's static no matter what input you pass in, you'll always get the same response:

Mock objects are used in mock test cases they validate that certain methods are called on those objects. Mock objects are simulated objects that mimic the behaviour of real objects in controlled ways. You typically creates a mock object to test the behaviour of some other object. Mocks let us simulate resources that are either unavailable or too unwieldy for unit testing.

mymodule.py:

test.py:

This is a very basic example that just runs rm and asserts the parameter it was called with. You can use mock with objects not just functions as shown here, and you can also return a value so a mock object can be used to replace a stub for testing.

More on unittest.mock, note in python 2.x mock is not included in unittest but is a downloadable module that can be downloaded via pip (pip install mock).

I have also read 'The Art of Unit Testing' by Roy Osherove and I think it would be great if a similar book was written using Python and Python examples. If anyone knows of such a book please do share. Cheers :)

radtekradtek

A stub is a fake object built for test purposes. A mock is a stub that records whether expected calls effectively occurred.

A stub is an empty function which is used to avoid unhandled exceptions during tests:

A mock is an artificial function which is used to avoid OS, environment or hardware dependencies during tests:

In terms of assertions and state:

Differences Between Pc And Mac

• Mocks are asserted before an event or state change
• Stubs are not asserted, they provide state before an event to avoid executing code from unrelated units
• Spies are setup like stubs, then asserted after an event or state change
• Fakes are not asserted, they run after an event with hardcoded dependencies to avoid state

References

Paul SweattePaul Sweatte

a lot of valid answers up there but I think worth to mention this form uncle bob:https://8thlight.com/blog/uncle-bob/2014/05/14/TheLittleMocker.html

the best explanation ever with examples!

A Stub is an object that implements an interface of a component, but instead of returning what the component would return when called, the stub can be configured to return a value that suits the test. Using stubs a unit test can test if a unit can handle various return values from its collaborator. Using a stub instead of a real collaborator in a unit test could be expressed like this:

unit test --> stub

unit test --> unit --> stub

unit test asserts on results and state of unit

First the unit test creates the stub and configures its return values. Then the unit test creates the unit and sets the stub on it. Now the unit test calls the unit which in turn calls the stub. Finally the unit test makes assertions about the results of the method calls on the unit.

A Mockis like a stub, only it also has methods that make it possible determine what methods where called on the Mock. 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. For instance, you cannot see by the value returned from a dao object whether the data was read from the database using a Statement or a PreparedStatement. Nor can you see if the connection.close() method was called before returning the value. This is possible with mocks. In other words, mocks makes it possible to test a units complete interaction with a collaborator. Not just the collaborator methods that return values used by the unit. Using a mock in a unit test could be expressed like this:

unit test --> mock

unit test --> unit --> mock

unit test asserts on result and state of unit

unit test asserts on the methods called on mock

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following is my understanding..

• if you create test objects locally and feed your local service with that, you are using mock object. this will give a test for the method you implemented in your local service.it is used to verify behaviors

• when you get the test data from the real service provider, though from a test version of interface and get a test version of the object, you are working with stubsthe stub can have logic to accept certain input and give corresponding output to help you perform state verification..

Difference Between Stub And Driver

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