Questions tagged [tdd]
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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questions
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1answer
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What is the origin of TDD?
I have seen people point me to many different "origins" of TDD. Some will point me to Kent Beck's rediscovery in the late 1990s with XP. Others will mention the 1960s best practice of annotating the ...
121
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14answers
28k views
Why isn't TDD more popular in universities?
Recently, a person here asked a basic question about how to compute in Python all permutations of elements from a list. As for most questions asked by students, I haven't provided the actual source ...
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3answers
270 views
How to maintain XML/JSON serialization tests?
It is quite common to test JSON / XML producing methods against file-stored expected output (at least in Java world, but probably in other environments, too).
For instance there's a method that ...
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vote
3answers
290 views
In TDD, is it bad practice to write helper class for unit tests?
Sometimes when writing a unit test using Test Driven Development (TDD) one may find that checking if the result is the correct one is "more complicated than one line of code", probably deserving its ...
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10answers
8k views
In TDD, should I add unit tests to refactored code?
While refactoring my code using Test Driven Development (TDD), should I keep making new test cases for the new refactored code I am writing?
This question is bases on the following TDD steps:
Write ...
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2answers
123 views
How to convert from TDD scripts to BDD?
There are TDD automation scripts ready and running. TDD tests are written in granular level(class, functions, module) and BDD is written in Behavior level. Is it feasible convert this TDD script to ...
0
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1answer
104 views
Does it make sense to write one unit test and loop it through similar components?
I have a situation where I have different forms, each with 4 or 5 steps (components), and I decided to write one unit test per step.
After doing it, I noticed they were very similar and I could just ...
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vote
2answers
60 views
Laravel Controller Testing
This is the first time I tried TDD.
At the first time, my controller tests looks like this
use RefreshDatabase;
class ControllerCustomerIndustryTest extends TestCase
{
use RefreshDatabase;
...
24
votes
3answers
5k views
Struggling with cyclical dependencies in unit tests
I'm trying to practice TDD, by using it to develop a simple like Bit Vector. I happen to be using Swift, but this is a language-agnostic question.
My BitVector is a struct that stores a single UInt64,...
2
votes
3answers
591 views
TDD: Create a Game logic using Test-First Programming
I'm implementing a simple command line game using TDD principles and Unit Testing. My goal is to implement the whole game using Test-First Programming, so every behaviour/class is created from a test.
...
0
votes
1answer
75 views
Is it bad practice to have a helper package in go for testing purposes. Or is this introducing dependence's
I find myself repeating the same code when writing unit tests, for example... When writing functions that work with files, In the setup for the test i often write some code to create a file (in a ...
0
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1answer
117 views
How do I test a method which interacts with a database?
So I have a database class which has methods dedicated to specific actions. For example I have below method which accesses and writes to a table in the database:
def trackUserPerformance(self, ...
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vote
4answers
349 views
Is it bad practice to repeat logic being tested in unit tests?
Often I find myself writing a unit test for code and repeating some or a lot of the logic in the unit test to make the unit test DRY.
For example, consider the following piece of code:
function ...
1
vote
1answer
196 views
Applying BDD accross multiple microservices
I'm involved in a microservices based application. I'm trying to apply the BDD process for this. I need a recommendation how to apply this process correctly given this type of architecture. It is ...
2
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4answers
291 views
In TDD, should we specifiy all classes to implement before start coding
My team is interested to apply TDD in our next software project. We have a discussion about how many details should be specified in design specs before the developers start coding.
Some of us propose ...
0
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2answers
282 views
How to avoid ad hoc constructor for unit testing
According to the answer in this post Should my classes have separate constructors just for unit testing?
ad hoc constructor is not good and should be avoided.
Unfortunately, I have the same problem ...
1
vote
4answers
382 views
Is it still TDD if I follow the cycle for each method alone?
The question is not very expressive, anyway what I was wondering is if, if I follow the red-green-refactor cycle for each method is still TDD or if it has to be done globally.
I mean, let's say I have ...
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vote
3answers
203 views
What are the criterion to understand if someone used TDD?
I'm approaching the TDD methodology for software development, reading guides and writing simple applications, because a client of my company wants a software and asked to develop it using TDD ...
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votes
1answer
1k views
What should I test with unit tests for data access layer? (MongoDB)
I'm working in TDD for my data access layer in MongoDB and I don't know what should I test?
I think that I shouldn't test if the queries return what they have to return because It's a MongoDB concern....
0
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3answers
137 views
Is is worth the time to create a list of manual regression tests for a legacy application?
I am part of a new dev team that is assigned to work on a legacy app. The app currently has no regression or automated unit, integration and system tests.
Due to technical debt and convoluted ...
2
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2answers
176 views
TDD how to avoid test duplication across team
Our team has decided to develop using BDD/TDD in an effort to become the Agile team we're supposed to be. Vertical slicing appears to be an important part of agile working and gaining the quick ...
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votes
1answer
115 views
Unit Tests - correct approach to test system with multiple layers
I'm wondering about Unit Tests. Let say i got a code ( in C#, but language is not important here):
public class SOT: ISOT
{
List<string> _internalCollection = new List<string>();
...
1
vote
1answer
84 views
Should BDD/Gherkin be used only for user visible behaviour?
We're a small team of 3 senior and 1 junior developers and I've been tasked with introducing BDD within our development process.
To say there's a lot of confusion about BDD is an understatement and ...
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2answers
872 views
What is recommended way to create test data for unit test cases?
I am new to TDD/unit testing.
I am going to write a complex scheduling algorithm in Java. As this module is a core part of our application and there are number of scenarios in it, I want to write ...
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4answers
1k views
TDD: Uncle Bob's rules versus classic cycle
Uncle Bob says in 'The Clean Coder', chapter 5 'Test Driven Development':
You are not allowed to write any production code unless it is to make a failing unit test pass.
You are not allowed to ...
17
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7answers
4k views
Is it a good idea to write all possible test cases after transforming the team to TDD to achieve a full coverage?
Assume we have a large enterprise-level application without any unit/functional tests. There was no test-driven development process during the development due to very tight deadlines (I know we should ...
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2answers
523 views
How to unit test device driver initialization?
I am writing an IMU device driver in C using test-driven development methodology. As part of the driver, I pass a struct with user selected configuration settings to an initialization function which ...
4
votes
3answers
311 views
Making pull requests easier to review while practicing XP and refactoring
I practice TDD and refactor aggressively. Recently some colleagues have complained that the resulting pull requests are difficult to review, or would require a lot of regression testing.
When I ...
1
vote
1answer
173 views
NUnit specify TestCaseAttribute on implementation or create a test method
Based on this question about the correct usage of nUnit's TestCaseAttribute, I was wondering whether to specify the test case directly on the implementation or create test methods (as when using ...
126
votes
15answers
21k views
How do you write unit tests for code with difficult to predict results?
I frequently work with very numeric / mathematical programs, where the exact result of a function is difficult to predict in advance.
In trying to apply TDD with this kind of code, I often find ...
0
votes
0answers
49 views
Unit testing multiple values [duplicate]
If I create a function to calculate the square root of a number, I suppose i should write a single unit test (maybe two, to test how it handles negative numbers).
But what if I have a function which ...
38
votes
3answers
5k views
How do integration tests criticize design?
I'm having a read at J.B. Rainsberger's blog post on integrated tests and wonder in which way an integration test is more harsh with our design?
We write more integrated tests, which are bigger and ...
1
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1answer
94 views
A performant and robust way to reset multiple files to its original state (TDD)
In our automated Java tests, we sometimes encounter issues, such as:
Test A creates a custom file A.sh, that is then added on classpath
Automated testsuite cleanup does not know about random file A....
2
votes
1answer
314 views
Handling hardware dependency while unit testing
I am writing a driver for an IMU sensor using test driven development approach. Communication protocol of choice is SPI. Using CubeMX and STM32F415 processor, SPI interface is implemented in ...
4
votes
5answers
1k views
Should all class public methods come from an interface?
I'm currently learning about TDD techniques, one of the suggestion is to test only public methods and skip the private ones. I have also been reading about Mocking. If I want to mock a certain method, ...
1
vote
4answers
393 views
Unit testing Markov chain code
What are the best ways to unit test code that outputs random sequences satisfying specific conditions, such as Markov chains?
Let's be specific. There are two natural things to test:
That the ...
6
votes
2answers
622 views
TDD for Graphics application
I have googled and read few articles about the TDD for UI. I am not very much clear about how to start the implementation of the Graphics Application using Test Driven Development or how to write unit ...
2
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1answer
419 views
How to abstract HAL in embedded test driven development?
Recently I've been reading into topic of test driven development and decided to give it a go with a sensor driver I need. Sensor uses SPI interface and I will implement this driver on STM32F415 ...
2
votes
0answers
56 views
Where in your pipeline does a company that does X+ of deployments per day deal with running E2E/UA Tests [closed]
The ideal goal for my system is the ability to perform an arbitrary number of deployments per day to production while making sure each 'push' goes through the full test suite to make sure it holds up ...
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6answers
604 views
Is it bad practice to code the solution, then redo in TDD?
I might be wrong, but I feel like the best approach to TDD is Solution, Red, Green, Refactor (adding "Solution" to the standard formula).
By coding the solution first, I feel like I am much more ...
0
votes
2answers
1k views
TDD with layered architecture, while only unit testing domain logic
Our project have a lot of layers,
Entities
Repositories
UnitOfWorks
Domain Services (Business Logic)
Validation
Infrastructure
Application Services
etc..
We are only writing unit tests for ...
1
vote
1answer
307 views
How to unit test high-level abstractions that transform complex Data
I'm practicing unit testing (specifically Test-driven design or Red-Green-Refactor) while writing a recursive descent parser for a simple domain-specific language. In trying to unit test a method that ...
0
votes
1answer
105 views
Client-Side TDD Tests?
More specifically, with regards to ATDD (sort of BDD flavored, or some could argue what was actually intended in the first place by TDD) should be there much UI testing?
As I have been testing my UI ...
1
vote
1answer
90 views
Testing Client-Side Code w/o Introducing Brittleness
I'm finding it tough to test my client-side code without testing implementation details.
For example, lets say you are testing a login form that displays client-side validation errors and does not ...
1
vote
1answer
114 views
Test RESTful APIs?
When testing RESTful JSON APIs with ATDD/BDD practices in mind is it good practice to test the structure of the response?
I'm thinking that it could too easily change, thus making for a brittle test. ...
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votes
1answer
73 views
What constitutes AGILITY where Behavior-Driven and Unit Testing are concerned
This morning I had a presentation on PHPSPec which the official website describes as follows:
A php toolset to drive emergent design by specification.
As defined within an adjective context the ...
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4answers
294 views
How to prevent implementation/algorithm from leaking into unit tests?
I'm hesitating between algorithm and implementation as most of the questions here on how to prevent coupling between implementation and tests are about using spies/stubs or mocks.
The typical problem ...
2
votes
1answer
461 views
Second step of BDD - write “failing scenario step”, does it mean the test for it?
Knowing that BDD somehow avoids using the term "test", I am trying to understand the process as described in a book called The Journey to Enterprise Agility: Systems Thinking and Organizational Legacy....
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4answers
1k views
How can you TDD for a bug that can only be tested after it has been fixed?
Here's one example: My web application contains draggable elements. When dragging an element, the browser produces a "ghost image". I want to remove the "ghost image" when dragging and I write a test ...
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1answer
197 views
TDD the implementation details or behavior only?
When i was developing a console app the algorithm was the following steps:
first create a temporary directory
then call another command that will create an xml file inside the the temporary ...
