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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TDD: Where should I start?

I've read a lot about TDD and I've tried to develop using TDD without success ... I always stop staring at the screen... I've learned that I should not write tests for methods or class. I should ...
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Test driven development when implementing a flexible length list

According to the commonly used TDD strategy, to implement something, you write a test that fail the code first, write the simplest code, refactor, and then repeat. I am trying to imagine this scenario ...
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How to setup TDD environment

In TDD, is it good practice to keep the tests in the same directory as the code its testing or is it better separate the tests in either a different directory or a separate project. Would it be the ...
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Testing To Prevent Cascading Bugs

Yesterday, Twitter was hit with a "Cascading Bug" as described in this blog post: A “cascading bug” is a bug with an effect that isn’t confined to a particular software element, but rather its ...
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490 views

Testing-related methodologies except TDD/BDD [closed]

Are there any testing-related methodologies except TDD/BDD? I see a lot of people who practice their own testing approaches (e. g., see Ayende post), but I don't see any formalization for it, no ...
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Unit Testing and .Net

Coming from a native development background, I'm used to my unit test runners outputting the file and line that caused the test failure. This allowed me to run the tests as a post-build step, and if ...
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529 views

Node.JS testing with Jasmine, databases, and pre-existing code

I've recently built the start of a core system which is likely going turn into a monster product. I'm building the system with node.js, and decided after I got a small base built, that It'd be a ...
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8answers
559 views

Emphasizing the importance of TDD to customers

The importance of TDD needs to be propagated but there's always a gap in the project timeline and time needed for developing a TDD project. Customers usually do not understand the importance of code ...
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203 views

If we have TDD and BDD why do we need QA for? [duplicate]

If we have TDD and BDD why do we need QA for? Isn't the job of the developer to write bugs or failing tests? If this is true how a QA fit in? Thanks.
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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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224 views

Review tests first

I am going to adopt TDD in our team and one of the ideas I have is to review tests first. So one would write interfaces, mocks, and tests first, submit them for a code review and once interfaces and ...
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Test-Driven Design is not Unit Testing [closed]

Ran across this statement by Martin Fowler circa 2002: Unit testing in XP is often unlike classical unit testing, because in XP you're usually not testing each unit in isolation. You're testing ...
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488 views

How to measure that a team is doing Test Driven Development

My team is considering a department goal of doing Test Driven Development next (fiscal) year. TDD sounds good and my manager is on board. The only problem is measurement. Our company rules require ...
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How can I create Assert.AreEqual(myobject,somevariable) a test in TDD before writing production code?

Im researching TDD, I'm not really sure how to write a test before I have written production code. The problem is that TDD states that you make assertions and then write your code so that these ...
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257 views

Building complex algorithms with TDD

I'm trying to adopt TDD in my daily programming practice. I use it at work very effectively, but I'm having trouble with my personal projects where I'm using some complex algorithms. The particular ...
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346 views

Are injectable classes allowed to have constructor parameters in DI?

Given the following code: class ClientClass{ public function print(){ //some code to calculate $inputString $parser= new Parser($inputString); $result= ...
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380 views

How to conduct a 3 days training on current techniques like TDD and CI

I am tasked to conduct a training for an upcoming team of 20 Java developers for a new project. The project owner wants us to use state of the art development techniques like TDD and CI. The ...
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992 views

Unit testing data access objects

I have recently started using test-driven development and unit testing, and it has paid off immensely in the areas where I have aplied it. One area that it has been helpful in is database access. When ...
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318 views

Are there any cases when one should not use Test Driven Development? [duplicate]

Is it recommended that TDD be always practiced in a project, or are there cases when it should be avoided? Should we all adopt TDD? Is it standard practice in major software companies?
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TDD in JavaScript [closed]

I'm about to participate in a Coding Kata and I would like to do it in JavaScript. What tools and libraries do I need for TDD in JavaScript?
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2k views

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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542 views

What if I can't make my unit test fail in “Red, Green, Refactor” of TDD?

So let's say that I have a test: @Test public void MoveY_MoveZero_DoesNotMove() { Point p = new Point(50.0, 50.0); p.MoveY(0.0); Assert.assertAreEqual(50.0, p.Y); } This test then ...
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173 views

Sprint Planning Meetings - determine if a work item is “planned”?

We've been working with Scrum for a while now, generally successfully. However of late, as the pressure has started to mount up we've encountered several situations where items came through planning ...
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How to implement isValid correctly?

I'm trying to provide a mechanism for validating my object like this: class SomeObject { private $_inputString; private $_errors=array(); public function __construct($inputString) { ...
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189 views

What is a “behavior rich object” and why would it be advantageous?

I am referring to the article Mocks aren't Stubs by Martin Fowler. When naming cases when he think "mockist" TDD will be advantageous, he said It's particularly worth trying if you are having ...
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299 views

Newbie worried about CASE tool

I'm looking for some guidance on CASE tools and whether my concerns are valid. Recently I was in a meeting between my employer and an external software company which have a CASE tool currently in ...
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957 views

Is the difference between BDD and TDD nothing more than a vocabulary shift? [duplicate]

I recently made a start on learning BDD (Behaviour Driven Development) after watching a Google tech talk presented by David Astels. He made a very interesting case for using BDD and some of the ...
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Whose responsibility is it to create the interface and/or acceptance testing? Developer or QA?

I am a backend developer and always create tests for my applications. Recently I study and apply the interface tests (using selenium), but I doubted whether I who should create these tests, developer ...
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282 views

Inheritance in test classes

I have an interface Serializer with methods serialize and isSerializerFor. I created a first implementation of this using TDD, and ended up with a nice clean test case fully covering a nice clean ...
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Should I use an aggregate root when designing my repository?

I have an entity that is called Master which is composed of a number of Slave entities. There can only be one Master in my database and I want to query repositories to get the Slave for a given id. ...
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1answer
77 views

Keep or discard tests that use methods now private [duplicate]

When writing object-oriented code from scratch, I try to follow these steps: Write a test that fails. Write a function that makes the test pass. When enough tests and functions are complete, ...
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296 views

Unit testing of “workflow” methods

We are currently developing a public API for our app. The methods on this public API are mostly putting together functionality in different corners of the system. An example would be: (names have been ...
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124 views

Is it ok to write “extra” unit tests?

My understanding of how TDD should work is that you write a failing test for the next bit of functionality you want to add to a function or object, code until the test passes and then write the next ...
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271 views

If TDD is design, how do you know your TDD is well designed? [duplicate]

Given a large group (50+) of programmers: All given the same problem, All using Test-Driven Development (TDD), All pair programming, All doing group-based code review, I have personally seen the ...
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890 views

How to organize unit/integration test in BDD

So finally after reading a lot, I have understood that the difference between BDD and TDD is between T & B. But coming from basic TDD background, what I used to was, first write unittest for ...
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170 views

How to keep settings for C++ Unit Test modules in sync with the production code modules?

Note: I'm coming from a Windows / Visual-C++ background. Note: I have already read Michael Feathers' Working Effectively with Legacy Code. Note: Broad question, asking for narrow answers, i.e. while ...
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512 views

Test-Driven Development with plain C: manage multiple modules

I am new to test-driven development, but I'm loving it. There is, however, a main problem that prevents me from using it effectively. I work for embedded medical applications, plain C, with safety ...
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520 views

Should you exercise TDD on prototype applications?

I'm developing an iOS app, which is a prototype for a customer. They're expecting it to not be of production standard and are happy for a few rough edges here and there. Since this is my first ...
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3answers
910 views

How do I make code bound to an ORM testable?

In Test Driven Development, how do I make code bound to an ORM testable? I am using a Micro-ORM (PetaPoco) and I have several methods that interact with the database like: AddCustomer UpdateRecord ...
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5answers
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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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747 views

“TDD is about design, not verification”; concretely, what does that mean?

I've been wondering about this. What do we exactly mean by design and verification. Should I just apply TDD to make sure my code is SOLID and not check if it's external behaviour is correct? Should ...
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520 views

Which class to start TDD of card game application? What's the next 5-7 tests?

I have started to write card game applications. Some model classes: CardSuit, CardValue, Card Deck, IDeckCreator, RegularDeckCreator, DoubleDeckCreator Board Hand and some game classes: Turn, ...
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7answers
362 views

Steps towards TDD [duplicate]

I need some advice to take the steps for TDD. How do we think in terms of interfaces for everything when we are writing code? Most of the testing books tell you how to write tests. But I want a book ...
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6answers
4k views

C# Unit Testing In A Single Project

Alright, so I'm doing my first "real" C# project. I'm chugging along, enjoying myself, nice little language I've got here, fairly easy to use, la ti da. Then I get to the point that I realize ...
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142 views

Requesting quality analysis test cases up front of implementation/change

Recently I have been assigned to work on a major requirement that falls between a change request and an improvement. The previous implementation was done (badly) by a senior developer that left the ...
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2answers
681 views

Which GOF design patterns work well with TDD, and which do not?

The GOF Design Patterns book rarely mentions the test-ability of each pattern. I'm aware that there are patterns such as Singleton that would lead to code for which it is difficult to write unit ...
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196 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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What is a good workflow for a C++ beginner?

I desire to become a more serious scientific C++ programmer. To do so, I need a consistent style of workflow (e.g., coding, test-driven development, etc.). My question is simply what sort of ...
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Test code that will be changed soon

My question is whether I should test code that I know will be changed in a short time. I'm doing TDD in ruby, and I often meet with this question. I'm interested about best practices about this, pro ...
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281 views

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 ...