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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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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60 views

Writing a gem supporting compiled languages with Rake. How to test?

I want to create a gem that extends the functionality of Rake, creating commands for compiling .NET code.* Basically, I want to be able to write a Rakefile like this: desc "Build main executable" ...
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195 views

How to write unit tests for a piece of code that has a data context?

I am new to unit testing and using Microsoft's unit testing library for following piece of code. When I execute the code normally it executes fine, however when I run unit test written for this code I ...
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2answers
103 views

TDD and Writing Tests for File Processing

These questions are very similar: TDD for batch processing: How to do it? and TDD: how to test file outputs? but I'm still left wondering some things The app processes files/pdfs. It takes them from ...
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1answer
91 views

What TDD/BDD tests should be writen to test an ORM

So I'm writing an ORM for NodeJS and using Mocha + Chai to test it. What I want to know is, what tests I should write to it, insertion tests should also have a querying test so I can check if the ...
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95 views

How to test network connectivity API using TDD?

I'm currently trying to add TDD on my workflow. I fail to create tests where I can easily test a library that requires remote connections. More precise, my program uses snmp4j library. Currently I'm ...
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2answers
96 views

Refactoring: reducing duplication without creating flags

I don't know how to refactor a piece of code that differs from other in the number of conditions checked on an if clause. Let me show you a real world example I'm facing right now. The only ...
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1answer
56 views

Starting a big application with unit testing [closed]

I am learning test driven develeopment and read some books about TDD. I learned rules of unit testing. How can I write unit test, how can I select test method names, Act, Assert, Action and like this. ...
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2answers
175 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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3answers
140 views

Test Driven Development when the specifications change

These days, it's fairly common for me to be tasked to make a change that actually breaks the prior spec. I know that one of the major ideas behind TDD is to have a suite that verifies all your changes ...
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1answer
136 views

Unit test approaches other than test-first and test-last? And what about variants of them? [closed]

I'm wondering if there are other approaches, old or new, to writing unit tests, and how viable they are, other than the traditional and tdd unit testing approaches. I know there is behavior-driven ...
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3answers
74 views

Generating test data for a search application

I have a general question about testing search applications, and what I'm looking for is pointers to resources on the topic that I can go and research on my own. I've tried semi-informed, ...
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2answers
84 views

Should you mock key-value stores/aggregators

I've always been taught that your tests should run in isolation, and other than a db for ActiveRecord etc., your tests should not rely on any external software/services. e.g. I always mock my other ...
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2answers
54 views

Unit testing the variables passed to the view from the controller

Let's say I want to test a controller that gets some value from a service and then pass some of all of those values to the view. Do you test that the view gets the result that the controller took ...
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6answers
483 views

I'm confused about which is the correct way to work with TDD

I'm trying to grasp what's the idea behind TDD and how a team is supposed to work with it. I have the following test case with NUnit + Moq (just writing by memory, it is not assured the example ...
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4answers
684 views

How to do Test Driven Development

I have just 2+ years of experience in application development. In those two years my approach towards development was as following Analyze requirements Identity Core component/Objects, Required ...
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3answers
138 views

What's the idea behind mocking data access in unit tests [duplicate]

I understand that you're not actually supposed to hit the database or disk when doing unit tests... Why is that? Also, taking something like Moq, what is it actually supposed to mock and where? For ...
2
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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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1answer
92 views

More appropriate to validate a dependency filter parameter by mock+stub or by expression compile?

My lead is enforcing TDD on our project. He says he's following Uncle Bob (Robert Martin) and SOLID principles. One of the rules he's reinforcing is what I call "the single cog rule"--there should be ...
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2answers
262 views

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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2answers
77 views

Should I put the name of the method I'm testing in the Unit Test method's name/assert message?

Given that a method's name might change in time, is it a good idea to specify the name of the method whose return value I am asserting as a part of the Unit Test method's name? What about the message ...
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3answers
753 views

In TDD should I have to write Test first or Interface first?

I am learning TDD using c#, as far as I know test should drive the development, that is first write a failing test after write the bare minimum code to pass the test then do refactoring. But it is ...
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1answer
92 views

Do you spend your effort to reuse obsolete unit tests or rewrite them entirely? [closed]

I have this javascript project which has a unit test suite(about 200unit tests) that covers about 11.31% of the code that it was testing. The project has evolved greatly but the unit tests where never ...
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5answers
192 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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5answers
295 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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51 views

Mixing newable and injectable in a Callable

I recently read http://misko.hevery.com/2008/09/30/to-new-or-not-to-new/ which discussed newable vs injectable objects. What would you do if you needed to make a Callable that talks to some service ...
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2answers
159 views

BDD/TDD - exhaustively testing details which are low-level, but still behaviour

We're looking to concentrate more on testing behaviour (as opposed to every class/method individually) in all our automated tests, as espoused by various high-profile online discussions recently. I ...
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2answers
113 views

In the BDD paradigm why should the “ubiquitous language” be merely semi-formal and not completely formal?

Here's the relevant quote: A common risk with software development includes communication breakdowns between Developers and Business Stakeholders. BDD uses the specification of desired behavior as ...
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4answers
322 views

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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394 views

Testing strategy for games

I've inherited a web-based educational game. Over the past year I've worked towards stabilizing the code and adding new features. Most of the logic is in the front-end, so back-end unit tests, while ...
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3answers
96 views

Is it anti-pattern to mix unit test and web test? [duplicate]

It is a language agnostic question, e.g. I have a unit test like # Unit test User user = User.create('john'); assertEquals("User name is john", "john", user.getName()); # Web test start from here ...
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2answers
47 views

Isolated Unit Tests and Fine Grained Failures

One of the reasons often given to write unit tests which mock out all dependencies and are thus completely isolated is to ensure that when a bug exists, only the unit tests for that bug will fail. ...
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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 ...
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2answers
141 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 ...
5
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1answer
155 views

Testing that an attribute does not exist cannot fail when writing tests before code

I have been taught to follow the Red->Greeen->Refactor pattern when doing TDD. There have been situations where this pattern have not been applicable though. For instance, a test to make sure that a ...
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3answers
197 views

Drawback of using static method [duplicate]

For methods that never access instance variable or static variable and they act just like a function (name-spaced) and they are deterministic base on only the input arguments , I want to ask, are ...
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1answer
72 views

Question about mocking externals [duplicate]

at company we're developing quite a big project and we're arguing at the testing strategy. The question is: should all of the tests be executed in isolation of external services like database or APIs ...
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3answers
177 views

Protected variable & protected method in the era of TDD [closed]

I understand protected method is good for unit testing since you can easily mock by the class by overriding the protected method for the sake of testing. However, protected variable is just a global ...
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6answers
2k views

Sense of unit tests without TDD

We have new (quite big) project starting, that we planned to develop using TDD. The idea of TDD failed (many business and non-business reasons), but right now we have a conversation - should we write ...
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2answers
73 views

how to write unit test for AND logic gate

I'm learning about unit tests, and have a doubt for a test i want to do, to implement an "AND" logic gate A B A^B 0 0 0 0 1 0 1 0 0 1 1 1 how can i test for a method that works ...
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233 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 ...
3
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4answers
197 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 ...
4
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1answer
78 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, ...
2
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1answer
84 views

Wrapping function in closures to make testable functions

In my nodejs project, I have functions like this for socketio. socket.on('draw', function (data) { socket.broadcast.to(socket.room).emit('draw', data); addEvent(socket, ["draw", data]); }); ...
17
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4answers
990 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 ...
2
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1answer
331 views

acceptance test driven development in c++

Was put on hold at stack overflow: hopefully it has value here. I want to use a BDD / TDD / ATDD approach in c++. However I really want to emphasize vertical slices of end to end functionality rather ...
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73 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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2answers
184 views

Relationship between TDD and Software Architecture/Design

I'm new to TDD and have been reading the theory since applying it is more complicated than it sounds when you're learning by yourself. As far as I know, the objective is to write test cases for each ...
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1answer
119 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
439 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 ...