Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [unit-testing]

Unit testing is a method by which individual units of source code are tested to determine if they are fit for use.

2
votes
2answers
3k views

How should I test the functionality of a function that uses other functions in it? [duplicate]

Suppose there is a function get-data which returns a map of information about the id of the user passed in. Now this function uses 3 functions source-a, source-b and source-c to get three different ...
167
votes
10answers
164k views

How do you unit test private methods?

I am working on a java project. I am new to unit testing. What is the best way to unit test private methods in java classes?
42
votes
5answers
6k views

Do I need unit test if I already have integration test?

If I already have integration test for my program, and they all passed, then I have a good feel that it will work. Then what are the reasons to write/add unit tests? Since I already have to write ...
85
votes
10answers
8k views

Where is the line between unit testing application logic and distrusting language constructs?

Consider a function like this: function savePeople(dataStore, people) { people.forEach(person => dataStore.savePerson(person)); } It might be used like this: myDataStore = new Store('some ...
111
votes
7answers
35k views

What should you test with unit tests?

I'm freshly out of college, and starting university somewhere next week. We've seen unit tests, but we kinda not used them much; and everyone talks about them, so I figured maybe I should do some. ...
15
votes
4answers
2k views

Staying OO and Testable while working with a database

What are some OOP strategies for working with a database but keeping things unit testable? Say I have a User class and my production environment works against MySQL. I see a couple possible approaches,...
98
votes
16answers
32k views

When is unit testing inappropriate or unnecessary? [duplicate]

It seems to be generally assumed (on Stack Overflow at least) that there should always be unit tests, and they should be kept up to date. But I suspect the programmers making these assertions ...
130
votes
14answers
20k views

When is it appropriate to not unit test?

I work in a small company as a solo developer. I'm the only developer at the company in fact. I have several (relatively) large projects I've written and maintain regularly, and none of them have ...
100
votes
11answers
23k views

(Why) is it important that a unit test not test dependencies?

I understand the value of automated testing and use it wherever the problem is well-specified enough that I can come up with good test cases. I've noticed, though, that some people here and on ...
54
votes
10answers
15k views

Should we test all our methods?

So today I had a talk with my teammate about unit testing. The whole thing started when he asked me "hey, where are the tests for that class, I see only one?". The whole class was a manager (or a ...
33
votes
5answers
12k views

Why is it often said that the test cases need to be made before we start coding? [duplicate]

Why is it often said that the test cases need to be made before we start coding? What are its pros and what the cons if we don't listen to this advice? Moreover, does that advice refer to black box ...
82
votes
11answers
55k views

Is static universally “evil” for unit testing and if so why does Resharper recommend it? [closed]

I have found that there are only 3 ways to unit test (mock/stub) dependencies that are static in C#.NET: Moles TypeMock JustMock Given that two of these are not free and one has not hit release 1.0, ...
346
votes
15answers
226k views

Is it OK to have multiple asserts in a single unit test?

In the comment to this great post, Roy Osherove mentioned the OAPT project that is designed to run each assert in a single test. The following is written on the project's home page: Proper unit ...
24
votes
7answers
3k views

How to Avoid Fragile Unit Tests?

We have written close to 3,000 tests -- data has been hard coded, very little reuse of code. This methodology has began to bite us in the ass. As the system changes we find ourselves spending more ...
23
votes
5answers
10k views

Would you rather make private stuff internal/public for tests, or use some kind of hack like PrivateObject?

I am quite a beginner in code testing, and was an assert whore before. One thing worrying me in unit testing is that is often requires you to make public (or at least internal) fields that would have ...
86
votes
12answers
7k views

How big does my project need to be for me to unit test it? [closed]

I assume that my project is decoupled enough to allow for unit testing. But how big, exactly, in terms of clases and functions does my project need to be to make unit testing worthwhile? We all make ...
17
votes
2answers
1k views

Software Testing Techniques or Categories [closed]

What kinds of software testing do you know? I've heard about Test-Driven Development, Unit tests etc, but can't understand their importance and difference. For example, why are we using regression ...
98
votes
18answers
18k views

Are unit tests really that useful? [closed]

I just graduated with a degree in CS and I currently have a job as a Junior .NET Developer (C#, ASP.NET, and web forms). Back when I was still in university, the subject of unit testing did get ...
112
votes
10answers
51k views

How should I test randomness?

Consider a method to randomly shuffle elements in an array. How would you write a simple yet robust unit test to make sure that this is working? I've come up with two ideas, both of which have ...
74
votes
11answers
11k views

Is it a bad practice to modify code strictly for testing purposes

I have a debate with a programmer colleague about whether it is a good or bad practice to modify a working piece of code only to make it testable (via unit tests for example). My opinion is that it ...
29
votes
6answers
3k views

How to explain the value of unit testing

I want to introduce the concept of unit tests (and testing in general) to my co-workers; right now there are no tests at all and things are tested by actually performing the tasks via the UI to see ...
25
votes
6answers
5k views

Databases and Unit/Integration Testing

I have had a discussion with someone about unit/integration testing with web applications and I have a disagreement about 1 core idea. The issues is that the person I am talking to think that the ...
13
votes
1answer
3k views

Is wrapping a third party code the only solution to unit test its consumers?

I'm doing unit testing and in one of my classes I need to send a mail from one of the methods, so using constructor injection I inject an instance of Zend_Mail class which is in Zend framework. Now ...
6
votes
1answer
4k views

Testing private methods as protected

I was reading this answer about testing private methods and it mentioned several possibilities: extract methods as public to another class make them public separate the env of test and production ...
14
votes
4answers
1k views

When should I use mock objects?

I've read a lot of things about TDD but I still have doubts. For example, I have these class diagrams: It's a simple example, just to learn about TDD and mock objects. Which test should I write ...
14
votes
4answers
1k views

Unit testing internal components

To what extent do you unit test internal/private components of a class/module/package/etc? Do you test them at all or do you just test the interface to the outside world? An example of these internal ...
12
votes
1answer
1k views

Unit testing for a scientific computing library

I've had a bit of experience with unit testing before, in what I call (not pejoratively) the classic software engineering project: an MVC, with a user GUI, a database, business logic in the middle ...
56
votes
7answers
44k views

Difference Between Unit Testing and Test Driven Development

From reading the descriptions, I understand that in TDD tests are done prior to writing the function and in Unit Testing, its done afterwards. Is this the main difference, or the two terms can't even ...
47
votes
9answers
8k views

Is unit testing or test-driven development worthwhile?

My team at work is moving to Scrum and other teams are starting to do test-driven development using unit tests and user acceptance tests. I like the UATs, but I'm not sold on unit testing for test-...
53
votes
10answers
2k views

How to test the tests?

We test our code to make it more correct (actually, less likely to be incorrect). However, the tests are also code -- they can also contain errors. And if your tests are buggy, they hardly make your ...
9
votes
5answers
5k views

How should I unit test mathematical formulae? [duplicate]

I have a number of functions that are pretty close to the mathematical definition of a function. For example, a simplified version of one of these functions may look like: int function foo(int a, int ...
203
votes
9answers
24k views

Is it normal to spend as much, if not more, time writing tests than actual code?

I find tests a lot trickier and harder to write than the actual code they are testing. It's not unusual for me to spend more time writing the test than the code it is testing. Is that normal or am I ...
116
votes
11answers
30k views

Are (database) integration tests bad?

Some people maintain that integration tests are all kinds of bad and wrong - everything must be unit-tested, which means you have to mock dependencies; an option which, for various reasons, I'm not ...
44
votes
5answers
4k views

How do you convince management to “invest” in unit tests?

How did you convince your manager to let you unit test? By "use", I mean being allowed to develop, check-in to source control and maintain the unit tests over time, etc. Typical management ...
29
votes
7answers
12k views

Automated unit testing, integration testing or acceptance testing [closed]

TDD and unit testing seems to be the big rave at the moment. But it is really that useful compared to other forms of automated testing? Intuitively I would guess that automated integration testing is ...
33
votes
3answers
19k views

Is it actually worth unit-testing an API client?

This is something that's been troubling me for a while now. Is it actually worth unit-testing an API client? Let's say you're creating a small class to abstract-away the calls to a petshop REST API. ...
37
votes
7answers
10k views

Is using “new” in the constructor always bad?

I have read that using "new" in a constructor (for any other objects than simple value ones) is bad practice as it makes unit testing impossible (as then those collaborators needs to be created too ...
27
votes
4answers
2k views

Unit testing best practices for a unit testing newbie

In recent years, I have only written small components for people in larger projects or small tools. I have never written a unit test and it always seems like learning how to write them and actually ...
26
votes
6answers
8k views

What is a normal “functional lines of code” to “test lines of code” ratio?

I'm pretty new to TDD approach and my first experiments say that writing 1 line of functional code means writing about 2-3 lines of testing code. So, in case I'm going to write 1000 LOC, the whole ...
15
votes
4answers
2k views

How to Quantify the Value of Unit Testing [duplicate]

Our organization is considering integrating unit testing into our software development workflow. I've heard lots of anecdotal stories about how it encourages better, easy to maintain, and well-planned ...
11
votes
4answers
1k views

Gradual approaches to dependency injection

I'm working on making my classes unit-testable, using dependency injection. But some of these classes have a lot of clients, and I'm not ready to refactor all of them to start passing in the ...
10
votes
2answers
2k views

Separate code coverage reports for unit and integration tests, or one report for both?

Should there be a separate code coverage report for unit and integration tests, or one code coverage report for both? The thinking behind this is that code coverage allows us to make sure that our ...
407
votes
12answers
16k views

Should I intentionally break the build when a bug is found in production?

It seems reasonable to me that if a serious bug is found in production by end-users, a failing unit test should be added to cover that bug, thus intentionally breaking the build until the bug is fixed....
130
votes
12answers
16k views

Time difference between developing with unit tests vs no tests

I'm a solo developer with a pretty time-constrained work environment where development time ranges usually from 1-4 weeks per project, depending on either requirements, urgency, or both. At any given ...
129
votes
10answers
10k views

TDD vs. Productivity

In my current project (a game, in C++), I decided that I would use Test Driven Development 100% during development. In terms of code quality, this has been great. My code has never been so well ...
56
votes
5answers
21k views

Is there a point to unit tests that stub and mock everything public?

When doing unit tests the "proper" way, i.e. stubbing every public call and return preset values or mocks, I feel like I'm not actually testing anything. I'm literally looking at my code and creating ...
72
votes
10answers
7k views

Does it make sense to write tests for legacy code when there is no time for a complete refactoring?

I usually try to follow the advice of the book Working Effectively with Legacy Code. I break dependencies, move parts of the code to @VisibleForTesting public static methods and to new classes to make ...
80
votes
11answers
10k views

Shouldn't unit tests use my own methods?

Today I was watching a "JUnit basics" video and the author said that when testing a given method in your program, you shouldn't use other of your own methods in the process. To be more specific, he ...
48
votes
11answers
31k views

What are the disadvantages of automated testing?

There are a number of questions on this site that give plenty of information about the benefits that can be gained from automated testing. But I didn't see anything that represented the other side of ...
24
votes
8answers
3k views

Are “TDD Tests” different to Unit Tests? [duplicate]

I read Stephen Walther's article about Test Driven Development (TDD) and unit testing. I think it was an excellent article. The author makes a distinction between what he calls "TDD Tests" and unit ...