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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Choosing an epsilon when comparing floating point numbers across different systems

I am transcribing thousands of lines of computational code from MATLAB to C++. I don't fully understand the math myself, but I can run it with MATLAB, assume it's correct, and compare the results to ...
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1answer
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Diferences between Test vs Spec

I'm having a concept problem at this point & I can't find any info about the diferences between Test (UnitTest, etc) vs Spec (Rspec, etc). As far as I know, specs is into Integration tests and ...
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Is it possible to know the names of functions that were called by a particular unit test in Javascript code coverage? [on hold]

I have a javascript project. I want to know the names of functions which were run by the unit tests. Is there a coverage tool that can provide this information? If no, how can I achieve this on my own?...
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1answer
37 views

Unit testing with external packages or assemblies

I'm unit testing a class which has two dependencies, both of which are external packages (I'm using C# so these are NuGet packages, AutoMapper and CompareNETObjects). (NOTE: Both are just utilities,...
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3answers
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Testing properties with private setters

Currently in a part of my project a domain object like below exists: public class Address { public virtual string HouseName { get; set; } public virtual string HouseNumber { get; set; } ...
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AutoFixture Problems with simple Types

I am trying to do TDD (I am a beginner in TDD) in my current project (WPF application, MVVM, C#) and use following frameworks for my tests: NUnit AutoFixture I have a ViewModel-class that I want ...
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How would one test a function with a large number of scenarios?

I've heard that it's ideal to have one assert (or expect or should, etc) per aspect of a component's behavior you're trying to test. Is this how it works? An addOne function would be tested like this, ...
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creating a teartown in integration test by deleting the test database and load the mdf again

I had a Friday developers debate with all my smart colleagues about Tear down process in Integration testing. They are putting a debate that getting a new database mdf file is better while during ...
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12answers
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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 ...
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10answers
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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 ...
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11answers
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Are magic numbers acceptable in unit tests if the numbers don't mean anything?

In my unit tests, I often throw arbitrary values at my code to see what it does. For example, if I know that foo(1, 2, 3) is supposed to return 17, I might write this: assertEqual(foo(1, 2, 3), 17) ...
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367 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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How am I supposed to add tests for all my projects?

I have been teaching myself how to code for about a year (I'm 17) and one of the most common things that I've come across while reading articles about programming is automated tests for your code. I ...
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4answers
349 views

Are there any alternatives to dependency injection for stateless classes?

I am working on an application whereby I have designed classes to fit into several groups: Immutable: initialised through constructors, uses copy-and-swap idiom (inc. move), can deep copy (i.e. ...
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8answers
545 views

Testing loses its effectiveness if all programmers don't use them

Let's assume you are convinced that the extra time spent unit testing has merit and improves production. Does that still hold up when everyone working on the same code doesn't use them? This question ...
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Do you inject everything explicitly used in a module even if it is loaded in a “parent” module?

When you build a app modularized what do you inject into submodules? Only those things that are used there but not added at the top level, or do you inject everything that is explicitly used in that ...
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10answers
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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 ...
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2answers
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Unit testing / How to validate private fields of a newly created object?

I have a basic unit test (for the sample) that involves this code: void testShouldCreateACar() { Car car = someone.createFerrari(); assertTrue(car.name == "Ferrari"); // can't access name since ...
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2answers
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Should we mock entities and value objects when doing DDD?

After reading a few articles about Newable vs Injectable objects and how these concepts relate to DDD's services, entities and value objects, I was left with some doubts about using newables in my ...
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Event Driven Programming: A sequence of unfortunate events

I have a very basic game loop whose primary purpose is to check for updates & changes to a list. I have contemplated using event driven programming to replace the game loop/list idea with an ...
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2answers
612 views

Who should initialize dependencies in a TDD application?

I'm trying to learn implementing TDD with mocking/fake objects. One of the questions I have is how to initialize a dependency in an application which implements TDD? An example from this article ...
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31 views

Debugger directions

I am running an old DOS executable file that runs a set of instructions to test an electronic component via com1 (RS-232) on a pc. The 16bit software has 8 main routines and some subroutines within to ...
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1answer
98 views

How to refer to unit tests not cleaning up after themselves? [on hold]

I am looking for a concise way to refer to the phenomenon of a unit test failing to clean up one or more artifacts, which affects the behavior/outcome of subsequent tests. Is there a standard term ...
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13answers
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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 ...
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3answers
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Are integration tests meant to repeat all unit tests?

Let's say I have a function (written in Ruby, but should be understandable by everyone): def am_I_old_enough?(name = 'filip') person = Person::API.new(name) if person.male? return person....
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Value of using private methods vs all public in classes for internal software for ease of unit testing [duplicate]

Here's a skeleton of a class I built that loops through and deduplicates data - it's in C# but the principles of the question aren't language specific. public static void DedupeFile(FileContents fc) {...
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What to do to during unit testing [duplicate]

I have trouble understanding what to do when unit testing. All over the web I find tutorial for how to use unit testing but it is always just tutorials about how the unit testing tools are working but ...
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1answer
971 views

How to test model binding within an MVC controller when Bind attribute with Include list is used?

Auto-generated action methods in MVC5 make use of the BindAttribute with an Include list that contains the field names in a string literal. Example: // POST: MyTable/Edit/5 // To protect from ...
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1answer
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Unit testing for data munging pipelines made up of one-line functions

Reading Mary Rose Cook's Practical Introduction to Functional Programming, she give as an example of an anti-pattern def format_bands(bands): for band in bands: band['country'] = 'Canada' ...
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Agile without unit tests

Does it make sense to talk about "agile development" or claiming that you are applying an "agile methodology" if the code base you are working on has 0% unit test coverage? (And you, as a team, are ...
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3answers
5k 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. ...
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4answers
499 views

Dependency Inversion expands the API, results in unnecessary tests

This question has bothered me for a few days, and it feels like several practices contradict each other. Example Iteration 1 public class FooDao : IFooDao { private IFooConnection fooConnection;...
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Is there any point in unit testing a client service that simply passes through data from the server? [duplicate]

Imagine a simple AngularJS REST Service which retrieves (GET) data from REST endpoints on a server. It maintains no state of its own and each method only passes back a promise to whomever is using ...
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Why aren't all method virtual or why doesn't have each class at least one interface?

This is more philosophical question, which address .NET platform, but maybe it is useful also for other languages. I'm doing lot of Unit Testing and especially when I'm using third-party components I ...
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1answer
52 views

Spring - rest API - How to unit test a rest API which gets data from another service

I am new to rest API's as well as mocks. Please help me .. I have a set of rest API's for which I need to write unit tests. rest API in turn calls another service , gets the JSON response and sends ...
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1answer
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How to move Python doctest examples into another unit test framework?

Years ago AFAIK the mathematitician and software developer Tim Peters discovered that very often the documentation of APIs tends to get out of date over time during the software live cycle, because ...
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How to remove a function or feature when using TDD

In texts about TDD I often read about "remove duplication" or "improve readability" during the refactoring step. But what makes me remove an unused function? For example let's say there is a class C ...
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2answers
29 views

Test arrangement using the system under test

I have some integration tests around stored procs. Typically I do the test setup using Dapper. This is fine for simple cases, but in some cases to setup up the system correctly it would be far simpler ...
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2answers
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How to go about testing un-injectable code?

So I have the following piece of code in use all over my system. We're currently writing unit tests retrospectively (better late than never was my argument), but I don't see how this would be testable?...
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9answers
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How to write unit tests before refactoring?

I've read some answers to questions along a similar line such as "How do you keep your unit tests working when refactoring?". In my case the scenario is slightly different in that I've been given a ...
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1answer
156 views

Unit testing C code?

I learnt about the check testing framework today that seems good. This far I've scripted tests that uses valgrind so that the tests both display output from the tests and from valgrind. Is there a ...
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4answers
10k views

How to Console.WriteLine from [TestMethod]?

I am trying to show some information from a [TestMethod] method. Usually we use NUnit and a line with Console.WriteLine runs fine and we can see it in 'output' window, but on this project we must to ...
2
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4answers
151 views

Unit Test for Void which copies data from one location to another

Still learning and getting my head around Unit Testing, (also trying to get into TDD, though I appreciate it isn't the same thing) and in many ways it is changing/improving my code. But I come across ...
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1answer
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Have the unit test “using” the project, or just have same namespace?

Background I am working on a project with C# .NET, and I've just added a new unit test project to my solution in Visual Studio. The way that I always have been doing this is: Create a new unit test ...
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2answers
648 views

Where to push a failing test?

I just changed branch settings on my GitHub repository, so that my [next] branch requires a passing CI build through a pull request. A discussion followed with a number of team members, about failing ...
24
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8answers
4k views

Wouldn't it be beneficial to write tests during code review?

A colleague of mine came up with an idea that I found interesting. Wouldn't it be beneficial to write tests during code review, by the person doing the review assuming that we don't do TDD? For ...
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Making my dependencies available in my public interfaces

I've made a bute Visual Studio extension. It works, and now I want to make it extensible and add unit tests. I notice straight off that I'm passing around within my methods, and making available in my ...
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6answers
3k views

Should there be unit tests for complex regular expressions?

Should I write unit tests for complex regular expressions in my application? On the one hand: they are easy to test because input and output format is often simple and well-defined, and they can ...
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12answers
7k views

Is there a reason that tests aren't written inline with the code that they test?

I've been reading a bit about Literate Programming recently, and it got me thinking... Well-written tests, especially BDD-style specs can do a better job at explaining what code does than prose does, ...
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3answers
2k views

Never written much unit tests, how can I practice more of it?

I have an interview coming up soon next week and there's a few things on their list of responsibilties for this software development job (the job position title is vague, it says java developer) that ...