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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700 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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4answers
199 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
298 views

How to know what to test in TDD? [duplicate]

I've heard about TDD more than one year ago, but until now I didn't manage to get myself started with it. Indeed, one of my greatest doubts is always what to test. The examples given always shows test ...
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3answers
1k views

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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7answers
196 views

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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6answers
322 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 ...
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2answers
1k views

How much extra time is needed to add unit test in a development task?

My team is considering moving to test-driven development. Currently we have almost no unit testing, we have been only relying on the user acceptance test, and developer's own manual test. Not everyone ...
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3answers
137 views

Using 2 Constructors: one that injects dependencies and one that instantiates them

I started using TDD for the first time on a project I started recently. I have a few objects with dependencies and structures that look something like this: public class MyClass { private ...
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5answers
240 views

Do I need a suite of unit tests for inner business-logic class? Since it's going to replicate the acceptance test suite for 90% [duplicate]

I'm new to TDD and wondering about methodolody. Given: A simple project which implements functionality of, for example, a console calculator. It has the following structure: Fairly simple ...
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2answers
209 views

TDD workflow for (implementation specific) edge cases

When developing features with TDD, I create a test for each combination of feature and case. So, one test for creating user successfully, one for validation errors, and one for database errors. I ...
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2answers
226 views

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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2answers
746 views

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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2answers
178 views

Is it okay to mock multiple objects in one class?

For developers with extensive experience using mocks, is it okay to mock multiple objects in one class (ie satisfy multiple interfaces) or is this not recommended? I am wondering because mocks are ...
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3answers
282 views

TDD adding simple properties

I am currently doing my first real project with TDD. I have written tests, and implemented most of the logic for the application. However, there are properties I know I need to have on the UI, ...
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3answers
181 views

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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4answers
182 views

Does not testing internals entail diligent refactoring and/or rely on developer talent?

I'm not asking here what the arguments are for/against testing internal methods (though I'll restate some, and don't mind hearing others). My questions relate to the implications of only testing ...
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2answers
259 views

Product Owner and automated tests

One of the claims of BDD-style development is that it bridges the gap between Product Owner and developers: the Product Owner writes a story, which can be converted in an equivalent automated test ...
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5answers
207 views

Should the test and the fix be written by different people?

There is a common practice in TDD to write a test before fix to avoid regression and simplify fixing. I just wonder what if the test and fix will be written by different people, total spent time will ...
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2answers
404 views

Unit testing behaviours without coupling to implementation details

In his talk TDD, where did it all go wrong, Ian Cooper pushes Kent Beck's original intention behind unit testing in TDD (to test behaviours, not methods of classes specifically) and argues for ...
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1answer
91 views

How to deal with changes that need further testing while working on another test?

TDD means to test before you start writing production code. So I start writing a test for MyClass called MyClassTest. It fails and I start to implement the wanted functionality in MyClass. During the ...
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2answers
176 views

Do you write unit testing or TDD as a line item requirement into your contracts or statements of work?

If you do, do you discuss coverage, continuous integration, quality control, or anything related to the difference between unit testing, functional testing and TDD in general? If clients ask, do you ...
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1answer
282 views

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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1answer
436 views

TDD and test automation in applications heavily dependent on databases and user input [closed]

Recently I have been reading online about eXtreme programming and agile practices. I wish to adapt them. However most of my code is all in PHP which is the normal CRUD type web applications. Moreover ...
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2answers
939 views

C++ TDD open source projects

Are there any open source projects out there that are written in C++ in an agile way (TDD maybe?). I am trying to contribute to a C++ open source project in order to catch up with the language and I ...
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2answers
101 views

How to pick the testing values for parameterized tests for stateless functions?

When writing (parameterized) tests for stateless functions, how do I determine the most ideal set of values to test with? I'm writing a class with mathematical functions in C#, and I want to write ...
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1answer
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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1answer
124 views

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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1answer
491 views

How to unit test with lots of IO

I write Linux embedded software which closely integrates with hardware. My modules are such as : -CMOS video input with kernel driver (v4l2) -Hardware h264/mpeg4 encoders (texas instuments) -Audio ...
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5answers
615 views

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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4answers
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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5answers
193 views

TDD: how to test file outputs?

I'm really new to TDD, so I guess this question is pretty basic. We're building a website, and part of the functionality is generating some files (binary files: Excel, PDF, whatever). How should I ...
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3answers
167 views

Test-driven development: To create test when issue is filed or when issue is picked up by somebody?

I've recently been working on a web development project on a team of less-than-five people. Things are going good but now we are decided to go with test-driven development. So far what I've learned ...
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5answers
496 views

DRY code, DRY tests?

At some point I had to create some class "Class1" and that class needs a method "method". So I have the following: Class1MethodTest: A total of N tests that check the behavior of Class1.method Class1 ...
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4answers
709 views

Development setup for TDD. Is it correct?

This is how my team has it's development environment set up: Each team member has a local development environment on their own computer, where they check out the code from a shared repository. Every ...
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2answers
177 views

TDD with repository pattern

In my new project, I decided to try with TDD. And in very beginning I encountered a problem. First thing that I want to do in my application is to give ability to read data from data source. For this ...
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1answer
245 views

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 ...
2
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3answers
604 views

TDD, BDD or both? [duplicate]

I'm a little bit confused about BDD. I'm doing TDD currently. My question is whether BDD is complementary to TDD or it's a whole new thing and my team should do both TDD and BDD? Or is it enough to ...
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3answers
342 views

What are the organizational benefits of TDD over functional development backed by unit tests?

I've heard of TDD as an organizational development paradigm, where all developers are asked to let testing drive development, and I've also heard of organizations who don't embrace TDD so long as unit ...
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3answers
120 views

Post-hoc testing in TDD recommended?

I have a personal project that doesn't have robust testing. I had a bit of TDD going on at the beginning, but it quickly became counterproductive as the project details changed dramatically over time. ...
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2answers
262 views

On which abstraction level would you do TDD?

Problem I find myself nailing the class structure down by having too many unit tests which makes making changes hard. Example Assume we have a class A which uses classes B1 and B2. Class B1 uses ...
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3answers
242 views

Debugging checklists: How much it's necessary to have? [closed]

Should making debug-checklists be an essential part of development process? How it can be integrated with unit-tests? Update Debugging checklist: Think about it as your troubleshooting checklist -- ...
2
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2answers
239 views

Moving legacy application to a testable framework?

We have a web application which contains a web service with over 50 methods. The application is currently installed at a number of sites and is currently being maintained by one developer. The ...
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1answer
471 views

Does a project using proper TDD have a lot of code without tests?

Most (all?) TDD resources show you how the cycle goes: Write Test Check Test Write Production Code Check Test Clean up Production Code Check test They also - to me - seem to imply that all code ...
2
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1answer
175 views

Test driven development workflow for two programmers

We are currently starting with TDD and we want to work in parallel in two programmers - one for writing test (Programmer A) and one for writing actual code (Programmer B). Problem is, how to ...
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1answer
286 views

2 questions about TDD

I'm just starting to get to grips with TDD, and I have 2 quick questions; I'm assuming that if I were writing software for a software company, that TDD would work alongside the software design? i.e ...
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3answers
147 views

How to test state of the object

I have a class DataImport with only two public methods public void fromStream(InputStream inputStream); public ImportCommand getImportCommand(); When I test it I send some test data to fromStream ...
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3answers
1k views

Mocking static methods

Having recently returned from a Test Driven Development (TDD) course I had the following thought. While writing unit tests using Mockito we came up against of the problem of mocking static methods. ...
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1answer
1k views

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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2answers
392 views

How do you end up with event-sourcing if you use a xDD approach?

When working in a TDD or BDD manner your unit tests are supposed to drive your design. But how do you end up with event-sourcing using a xDD techniques? As I see it event sourcing is something you ...
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1answer
120 views

How is the correct way of writing TDD for a void API?

Ok so my scenario is this: I have a third party component that offers an API for communicating with an external system. The method calls for commanding the external system to do stuff, all return ...