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

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Unit testing - should tests for a method validate the results of other methods?

One thing bothers me while I'm writing unit tests of my code. did tests of method should include validation of outcome from other methods? Of course, public methods. Let's go to - rather trivial - ...
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3answers
110 views

How important is automated testing in rapid release, non-critical (web) apps?

I think I understand the theoretical benefits of automated testing, especially unit testing. However, I'm not sure what the optimal amount of testing is when the project is a non-critical, rapidly ...
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1answer
106 views

Testing an MMO server [on hold]

I'm working on a server for a very large (feature wise) MMO. After some bad experiences with breaking changes that caused bugs weeks down the line, we'd like to add unit/automated/regression tests to ...
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17 views

Run RSpec from within a ruby script while refreshing all ruby configs etc

I'm working with a very large project with tons of established tests that include some reasonably complicated environment setups and what not. I've recently run into a situation testing some ...
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4answers
124 views

Should each method have a seperate JUnit test class?

I am writing JUnit unit tests for my classes. Is it better to have a separate class for each method, or have just one test class for every actual class?
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2answers
348 views

What is the most appropriate testing method in this scenario?

I'm writing some Objective-C apps (for OS X/iOS) and I'm currently implementing a service to be shared across them. The service is intended to be fairly self-contained. For the current functionality ...
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3answers
194 views

What is the best use case for selenium?

I've been trying to develop web applications while at the same time creating the testing. I understand unit testing, I can declare a test method and test specific methods in my application. But I ...
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2answers
87 views

Should we test the values of objects returned from the methods being unit tested?

Being new to unit testing I would like to know if I am supposed to test the values of objects returned from methods when doing unit testing. As an example, consider the following classes: public ...
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1answer
180 views

Which is the more testable C function implementation?

I write code in C. I have been striving to write more testable code but I am a little confused on deciding between writing pure functions that are really good for testing but require smaller functions ...
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4answers
168 views

How to identify and run the most relevant automated tests?

Suppose you have a reasonably large codebase (0.5 - 1 msloc) with a large test-suite (6-7hr single-threaded runtime; with a mix of unit-tests and integration-tests built with different tools). You ...
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2answers
207 views

Am I doing TDD wrong when multiple tests can fail for the same reason?

Assume a method with the following declaration public IList<Location> GetLocations() { ... } I write (at least) the following tests Check to see if the method returns an empty collection if ...
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1answer
84 views

Test Driven Development for Complex Games

I'm coding a game in my spare time, but I am mostly still a beginner when it comes to programming. I'm sorry if this question is off topic or if it ends up not being helpful to anyone else, but ...
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63 views

Unit testing statically loaded data

Scenario: I have a configuration file containing some structured data that is loaded in at runtime and is not modified by the application, but is referenced in many places. There are functions that ...
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2answers
288 views

Is there a better way to organize my module tests that avoids an explosion of new source files?

I've got a neat (so I thought) way of having each of my modules produce a unit-test executable if compiled with the -DTESTMODULE flag. This flag guards a main() function that can access all static ...
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1answer
2k views

How do I decide what testing framework to use?

The situation is this. I'm a junior developer for a small government IT project. We don't have anything of continuous integration or a automated testing framework. But the idea is to be developing ...
141
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16answers
11k views

Why does automated testing keep failing in my company?

We have tried to introduce developer automated testing several times at my company. Our QA team uses Selenium to automate UI tests, but I always wanted to introduce unit tests and integration tests. ...
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1answer
167 views

Is testability and mockability really that important in web development?

I'm reading this series on Laravel, and it's in great depth dealing with making everything testable, using Repository instead of just using the Models, using Dependency Injection and other obscure ...
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1answer
50 views

Testing Facades, Is it a good idea?

I stumbled across a need to create a thin I/O Layer interface to abstract away a class from the need to know about I/O public interface IFileIOProvider { Task WriteFileAsync(String contents, ...
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7answers
544 views

Why don't I see many unit test projects that bring up and tear down a DB? (ASP.NET MVC)

I see all the examples that demonstrate unit testing code and mocking the calls to the DB since you are not suppose to touch the DB. But it seems to me having a set up tasks that uses the actually ...
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13answers
3k views

Unit-testing of inherently random/non-deterministic algorithms

My current project, succinctly, involves the creation of "constrainably-random events". I'm basically generating a schedule of inspections. Some of them are based on strict schedule constraints; you ...
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1answer
74 views

Testing gap between unit and integration: Integration in the Small, Component, Unit Integration Tests

Over the past few weeks I've been mulling and researching how to fill a gap in our testing methodology. In simplified terms unit tests are too small and traditional integration tests are too big. A ...
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6answers
3k views

Why isn't testing a language a supported feature at the syntax level?

You can find an endless list of blogs, articles and websites promoting the benefits of unit testing your source code. It's almost guaranteed that the developers who programmed the compilers for Java, ...
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4answers
721 views

How can I use unit tests and TDD to test an app that relies mostly on database CRUD operations?

At work, one of my projects is mostly about taking data passed in from an external client and persisting it in a database. It's a Java enterprise app using JPA and most of our logic revolves around ...
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3answers
283 views

Is it feasible and useful to auto-generate some code of unit tests?

Earlier today I have come up with an idea, based upon a particular real use case, which I would want to have checked for feasability and usefulness. This question will feature a fair chunk of Java ...
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191 views

How should I test boolean function with many possible permutations

When I write an unit test I usually provide a context (plain object or mocked/stubbed object) that I setup in some ways and then I can run assert statement on the context: note: code is in ...
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7answers
491 views

Coding and testing in the same sprint

How is testing handled within the same sprint as coding, if all or most of the coding is not done until the end of the sprint? (I'm referring to the "soup-to-nuts" development and testing of a single ...
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1answer
493 views

scons and python unit tests best practices

I am using scons to build a large project containing a mix of C++ and Python. I would like scons to run Python unit tests either using nose or not. Currently, we have a long list of tests files and ...
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1answer
112 views

Approach to cover all the cases in Unit Tests [duplicate]

I am new to Unit Testing and i am able to write them but my problem is I am not sure that I have covered everything in Unit Tests. What could be the approach for testing some functionality in a code?
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467 views

Should unit test be in separated repository?

Should I put unit testing stuffs in a separate repository, not in the same repository as the programming library? So I reference the programming library as submodule. But most open source projects ...
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1answer
120 views

In an enterprise setting, does one apply BDD principles alongside of, or instead of, “traditional” unit testing?

I have a problem visualising how the gap is closed between coarse-grained, n-tier boundary, high level, automated acceptance testing and lower level, task/sub-task scope Unit Testing. My motivation ...
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461 views

Is spying on tested class bad practice?

I am working on a project where class internal calls are usual but the results are many times simple values. Example (not real code): public boolean findError(Set<Thing1> set1, ...
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3answers
172 views

How should I unit test a bitmap modifying method?

My Sprite class has a method: private void updateWithBitmap(Bitmap b, int x, int y) This will 'lay on top' the bitmap that's passed in, the top left corner of the passed in bitmap being at the x,y ...
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1answer
73 views

Should “tests” be kept out of the main merge pipeline?

We all know sometimes a e.g. merge can go wrong. If our [unit / integration] tests are in the same repository as the merge, is there then a weakness there that if the tests have merged incorrectly ...
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Are asserts or unit tests more important?

Both asserts and unit tests serve as documentation for a codebase, and a means of discovering bugs. The main differences are that asserts function as sanity checks and see real inputs, whereas unit ...
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155 views

Unit testing - one test is partly a “superset” of another, is this wrong?

Wasn't sure how to phrase that title, sorry! I've just come across this in our code base, and was wondering what the consensus was about how to unit test it: C# (-ish, sorry, this is paraphrased ...
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2answers
227 views

What kind of code would Kent Beck avoid unit testing? [duplicate]

I've been watching a few of the Is TDD Dead? talks on youtube, and one of the things that surprised me is Kent Beck seems to acknowledge that there are just some kinds of programs that aren't worth ...
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66 views

Creating an Interface To a Language's Standard Library?

In the process of learning test-driven development, I've been introduced to dependency injection and the use of interfaces, and have started using these concepts in my own PHP code in order to make it ...
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1answer
114 views

Your thoughts on Best Practices for Scientific Computing? [closed]

A recent paper by Wilson et al (2014) pointed out 24 Best Practices for scientific programming. It's worth to have a look. I would like to hear opinions about these points from experienced programmers ...
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1answer
101 views

Is the test, which touches the filenames under directory, a kind of unittest? [closed]

I was told that unittest is fast and the tests which touches DB, across network, and touches FileSystem are not unittest. In one of my testcases, its input are the file names (amount about 300~400) ...
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10answers
4k 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 ...
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1answer
70 views

How to unit test models in MVC / MVR app?

I'm building a node.js web app and am trying to do so for the first time in a test driven fashion. I'm using nodeunit for testing, which I find allows me to write tests quickly and painlessly. In this ...
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3answers
329 views

Inheritance vs containment while extending a large legacy project

I have got a legacy Java project with a lot of code. The code uses MVC pattern and is well structured and well written. It also has a lot of unit tests and it is still actively maintained (bug fixing, ...
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409 views

How do you unit test your javascript

I spend a lot of time working in javascript of late. I have not found a way that seems to work well for testing javascript. This in the past hasn't been a problem for me since most of the websites I ...
9
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6answers
483 views

How to use unit tests as a source of information?

A colleague of mine was once at a seminar about agile development, where he heard it is possible to use unit tests as technical documentation. Something like using unit tests as an example of how to ...
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1answer
104 views

Separate Action from Assertion in Unit Tests

Setup Many years ago I took to a style of unit testing that I have come to like a lot. In short, it uses a base class to separate out the Arrangement, Action and Assertion of the test into separate ...
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2answers
159 views

Scenario to illustrate how unit testing leads to better design [closed]

For an internal training session, I'm trying to come up with a simple scenario that illustrates how unit testing leads to better design, by forcing you to think about things like coupling before you ...
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3answers
454 views

Unit Testing Wrapper (Facade?) Method

I have to write unit tests for some classes my group is developing. The classes are fairly simple, and I'm not sure how to best test them. public class MyObjectRegistry { private ...
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1answer
75 views

How to write a good mock for testing

I code in Python and I'm starting to use the Mock library. Although I've read through all of the documentation, something that I'm finding hard to understand is 'What makes a good mock'. For ...
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340 views

Designing unit tests for a stateful system

Background Test Driven Development was popularized after I already finished school and in the industry. I am trying to learn it, but some major things still escape me. TDD proponents say lots of ...
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105 views

How do you detect lying Stubs/Mocks?

Consider this piece of code from the PHPUnit manual(I'm using PHP only as an example): class StubTest extends PHPUnit_Framework_TestCase { public function testStub() { // Create a ...