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Intro

Modelling by Example Combining BDD and DDD concepts

Behaviour Driven Development

BDD is the art of using examples in conversations to illustrate behaviour - Liz Keogh

Why Examples?

Rules are Ambiguous

Examples are Unambiguous

Examples are Objectively Testable

Gherkin A formal language for examples

You do not have to use Gherkin

Scenarios are not Contracts

Scenarios Create a shared understanding of a feature + Give a starting definition of done → Provide an objective indication of how to test a feature

Domain Driven Design

DDD tackles complexity by focusing the team's attention on knowledge of the domain - Eric Evans

Ubiquitous Language A shared way of speaking about domain concepts → Reduces the cost of translation when business and development communicate → Try to establish and use terms the business will under…

By embedding Ubiquitous Language in your scenarios, your scenarios naturally become your domain model - Konstantin Kudryashov (@everzet)

The best way to understand the domain is by discussing examples → Write scenarios that capture ubiquitous language → Write scenarios that illustrate real situations Directly drive the code model from…

Directly driving code with Behat?

Improving scenarios

Add realistic details

Actively seek terms from the domain

Get good at listening

Model values as Value Objects

Model boundaries with Interfaces

Description:

Explore Modelling by Example techniques in this PHP UK Conference talk, combining Behaviour Driven Development (BDD) and Domain Driven Design (DDD) to create a workflow that directly drives code from user requirements. Learn how to define features through stakeholder conversations, capture automatable requirements, and express them in the object model using tools like Behat and PhpSpec. Discover the benefits of using examples to illustrate behavior, understand the Gherkin language for formalizing examples, and grasp the importance of establishing a Ubiquitous Language for effective communication between business and development teams. Gain insights on improving scenarios, modeling values as Value Objects, and defining boundaries with Interfaces to create a more robust and domain-focused codebase.

Driving Design through Examples

PHP UK Conference

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