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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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1answer
91 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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2answers
52 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; ...
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3answers
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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,...
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3answers
388 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. ...
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1answer
71 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 ...
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1answer
104 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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4answers
309 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 ...
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1answer
122 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 ...
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4answers
257 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 ...
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2answers
209 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 ...
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4answers
346 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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3answers
191 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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1answer
801 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....
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3answers
133 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 ...
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2answers
167 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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1answer
95 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>(); ...
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1answer
77 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
639 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 ...
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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
394 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 ...
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3answers
280 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 ...
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1answer
138 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 ...
124
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15answers
20k 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 ...
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0answers
45 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
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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 ...
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1answer
91 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....
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1answer
245 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 ...
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5answers
861 views

Newbie question: 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, ...
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4answers
372 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 ...
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2answers
545 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
356 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
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0answers
55 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
568 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 ...
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2answers
931 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 ...
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1answer
260 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
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1answer
97 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 ...
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1answer
89 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 ...
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1answer
109 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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1answer
72 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
280 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
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1answer
362 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
897 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
182 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 ...
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2answers
156 views

Class design - Inject data or inject repository/service to fetch data?

Let’s say for example I am developing a fictional class called WidgetMaker. If the class depends at some point on lookup data stored in a database is it better to design the class with a dependency ...
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1answer
39 views

Testing Application Helper that Depends on Controller

I am working on practicing TDD/BDD/ATDD and I am working on a rails application. I created a helper method that depends conditionally on the type of controller being tested. module ApplicationHelper ...
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1answer
39 views

Worth it to test client side element presence for web application?

I've really been focusing on making my tests maintainable by focusing on BDD-style tests and only focusing on interfaces. I do not want my tests to be brittle and prevent refactoring. Is it worth it ...
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8answers
388 views

TDD when testable requirements are hard to come by

I'm in a funny situation. We have a development model that works for an in-house software suite which is focused on responsiveness to the customer. To give you a sense of the environment, when we ...
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5answers
4k views

Testing a list…All in the same test or one test for each condition?

I'm testing that a function does what expected on a list. So I want to test f(null) -> null f(empty) -> empty f(list with one element) -> list with one element f(list with 2+ elements) -> ...
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2answers
580 views

TDD workflow with integration testing

I'm having troubles with using the right workflow with TDD. Some people say we should design before writing any code, some say we should make a test, make it pass, then refactor the code and that ...