TDD stands for Test-Driven Development, or Test-Driven Design. It is the practice of writing a unit test before writing code to satisfy it, in what is known as the Red-Green-Refactor cycle.

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Programming methodologies at stackoverflow [closed]

I am in the middle of starting up a software company where we would use ASP.NET MVC and ASP.NET WebAPI extensively at shop. We will be a group of 4 and no more than 10 will work on any particular ...
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Testing a codebase with sequential cohesion

I've this really simple program written in C with ncurses that's basically a front-end to sqlite3. I would like to implement TDD to continue the development and have found a nice C unit framework for ...
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Test Doubles : Do they go in “source packages” or “test packages”?

I've got a couple of data access objects (DefaultPersonServices.class, DefaultAddressServices.class) which is responsible for various CRUD operations in a database. A few different classes use these ...
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How can I unit test a class which requires a web service call?

I'm trying to test a class which calls some Hadoop web services. The code is pretty much of the form: method() { ...use Jersey client to create WebResource... ...make request... ...do ...
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How does TDD address interaction between objects?

TDD proponents claim that it results in better design and decoupled objects. I can understand that writing tests first enforces the use of things like dependency injection, resulting in loosely ...
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Difficulties With TDD & Refactoring (Or - Why Is This More Painful Than It Should Be?)

I wanted to teach myself to use the TDD approach and I had a project I had been wanting to work on for a while. It wasn't a large project so I thought it would be a good candidate for TDD. However, I ...
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How to deal with the notion of time in UI/Integration tests

There are some well-known techniques for dealing with the notion of time in unit tests. These allow you to write unittests that always work with a specific time so the outcome of the test is ...
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When should I write integration tests?

According to rules of TDD unit tests are written before production code, but what about Integration tests that exercises interaction between concrete (non mocks) wired objects? Should they be written ...
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Can you apply agile/TDD in all circumstances?

I'm not against agile/TDD and use it under most circumstances. However, in some circumstances I feel it doesn't work well. For example, the other day I was building a fairly complex data processing ...
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How do you unit test a User Interface? [closed]

I use JavaScript with JQuery for a Rails application. I have some dynamic behaviour in this one. As a Ruby developper, I like TDD/BDD, specialy with RSpec. For the moment, I test my JavaScript ...
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Writing Tests for Existing Code

Suppose one had a relatively large program (say 900k SLOC in C#), all commented/documented thoroughly, well organized and working well. The entire code base was written by a single senior developer ...
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Designing new application from scratch, TDD, MVC, OOD based [duplicate]

I'm about to improve my skills in all that is related to designing applications from scratch using proper OOD principles, involving MVC pattern and using TDD approach to do it. I have a project for ...
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Who should be responsible to write test cases? [duplicate]

Should tests in some project be written by the actual person that does the coding (usually senior in our team) or it can be done by junior coders with less experience?
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The Relative Cost Efficiency of (Acceptance) Test Driven Development

I would like to know what the overall impact of resource planning on a software project is, where the requirements and design of the project are driven by automated acceptance tests and unit tests, in ...
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696 views

How to practice ATDD if design is not yet emerged from TDD?

Despite being very stakeholders friendly, ATDD aimed to provide a "stop" line when a feature has just been done. This avoids wasting time to add non-focused (and sometimes useless) code. That's why ...
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TDD / one test representing the whole scenario ? or should I split it? [duplicate]

While practicing TDD, I came across this specification: A user should be created with its password hashed, be persisted and an activation token should be returned. Should my first unit test, (aiming ...
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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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360 views

Is it worth writing a unit test for a DTO with the most basic getter/setters? [duplicate]

The advantage is it protects your DTO against future "enhancements" ?
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How do I test this?

I've attempted test first in Ruby on Rails using Test Unit and RSpec. I'm wondering how to do test first in situations that are more closely tied to the OS/filesystem. Problem: Building a USB stick ...
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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 ...
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Tools that can catch “fake coverage”?

Hypothetical scenario: codebase is exercised by unit tests run by a TeamCity build-bot, that also uses the built-in dotCover tool to provide coverage metrics. The build will fail if less than X% of ...
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Writing unit test only for applications that requires them [closed]

Bit of a rant, but bear with me. People call me purist. I do not code in any way other than TDD. When I try to push TDD as a company policy, the following conversation: company owner: "we'll do TDD ...
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665 views

TDD Mock call verification - is it an anti-pattern?

I've been doing TDD for year now, I feel pretty good about it, I love my test suites and all. However I've noticed that lately I've been doing a lot of mock call verification. For example I'd have a ...
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Why is TDD not working here?

I want to write a class A that has a method calculate(<params>). That method should calculate a value using database data. So I wrote a class Test_A for unit testing (TDD). The database access ...
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613 views

Unit test SHA256 wrapper queries

I have the following SHA256 wrapper. public static string SHA256(string plainText) { StringBuilder sb = new StringBuilder(); SHA256CryptoServiceProvider provider = new ...
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When to write tests for a new class using BDD?

I've been practicing behaviour driven development (BDD). I understand that you have to write tests that test the behaviour of the code, and this will allow the design of your code to evolve and take ...
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TDD and Version Control

I am currently learning about TDD and trying to put it into practice in my personal projects. I have also used version control extensively on many of these projects. I am interested in the interplay ...
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I don't understand how TDD helps me get a good design if I need a design to start testing it

I'm trying to wrap my head around TDD, specifically the development part. I've looked at some books, but the ones I found mainly tackle the testing part - the History of NUnit, why testing is good, ...
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End-to-end tests versus unit tests, should tests be decoupled?

At our company we typically make sure that we write an end-to-end test for our websites/web apps. That means we access a URL, fill in a form, submit the form to another URL and check the results of ...
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101 views

Production or Custom Test Data for Unit Testing?

I've recently had a little disagreement with fellow developers. We're transforming various ontologies from the original source format (Pica+, RDF, etc) into our data format and have several converters ...
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383 views

Fundamental TDD: stuck with writing a test so I can write code that I want

I have a Season class. This Season has a few properties: among them, a list of Games. This should be populated from the same source that populated the rest of the Season properties. I have a test ...
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179 views

Shared context: good or bad?

RSpec allows users to share context across tests / examples, which would reduce the number of code lines in my app by a significant amount. On the other hand, somehow related to the question of ...
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A weakness of the TDD method?

This is in summary the TDD method: Write a test check if thes test fails write production code run test I think that TDD as presented works only in ideal circumstances. I'll take a simple ...
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How do you test database abstraction in PHP?

I apologise in advance if this question is too subjective but I'm struggling to find a good answer, probably as there is not really a correct answer to give. I'm currently writing a database ...
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Why do we write our specs in different files from our source?

The D Programming Language supports writing unit tests inline with source. There's a Ruby gem called test_inline that lets you write specs in the same file as your code. Why is it generally ...
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Stubbing and mocking boundaries

Suppose I'm building a JSON API and would like to include an endpoint that returns a list of recently created posts. Somewhere in my system is an existing Post model with the following test: create ...
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What to do when your colleagues don't value code maintainability [duplicate]

I've been working in the same software development department for a few years now. In that time, the average stay of a developer has been 6-9 months. A handful have been around for over 2 years, but ...
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How to time the sprints in Scrum to allocate time for TDD?

We have sprints of 4 weeks duration. What I have been doing is 3 weeks dev time and 1 week of pure manual/automated testing, stabilization and shipment assurance testing. How to manage TDD within ...
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Understanding unit tests/TDD for ASP.NET webforms [closed]

I'm the lead programmer at a small software firm (currently 4 developers including myself), we develop bespoke ASP.NET WebForms applications for businesses. I joined there in 2010 just after ...
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In TDD, if I write a test case that passes without modifying production code, what does that mean?

These are Robert C. Martin's rules for TDD: You are not allowed to write any production code unless it is to make a failing unit test pass. You are not allowed to write any more of a unit test than ...
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What's the next logical TDD move in this learning example?

I'm inching my way up the TDD ladder and I've got to a point where I'd like to get advice on the "next move". I realize there might not be a single answer here, so any logical suggestion would be ...
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475 views

Should I use TDD and BDD if my project is changing fast?

I have my own little project I am creating using RoR, I plan it to have small-medium load. With no doubt I started with BDD and TDD (Cucumber and RSpec to be exact, but I am also experienced with ...
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Is there a modern replacement for a mutation testing tool like Jester for Java?

“Why just think your tests are good when you can know for sure? Sometimes Jester tells me my tests are airtight, but sometimes the changes it finds come as a bolt out of the blue. Highly ...
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Do I need to learn python first to understand the part 2 of the book Test Driven development?

It seems like Python is used as a coding language for part 2 of Kent Beck's book Test Driven Development. I have read the first part of that book and started appreciating the value of TDD . First part ...
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Can I start with a passing unit test?

Uncle Bob's rules for TDD are specified here. You are not allowed to write any production code unless it is to make a failing unit test pass. You are not allowed to write any more of a unit test ...
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4answers
2k views

Why is test driven development missing from Joel's Test?

I was reading this blog by Joel Spolsky about 12 steps to better code. The absence of Test Driven Development really surprised me. So I want to throw the question to the Gurus. Is TDD not really worth ...
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Unit testing on visualization (3D graphics) frameworks

This is a follow up to this question. There I was asking how to do unit testing when you have a library of scientific algorithms. I have a similar problem now but with a different project. I'm ...
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Should I write a test to prove that deleting code fixes a bug?

Occasionally I'll run into the situation where fixing a bug requires that I delete a section of code. The TDD purist would (I assume) advocate writing a failing test, deleting the code, then watching ...
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Functional testing and Acceptance testing leading to redundant code

What I know is: A Functional test aims to test a single component (like a WebApp's Controller) from the point of view of the developer. => Did I achieve all the requirements to make it work well? ...
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organising classes / folder structure for TDD-based development

Due to test-driven development, one ends up with many classes doing just one thing. It is quite a headache just to see where such classes would be placed inside the folder structure. First of all, ...