![]() Minimal code: test code is succint, with less boilerplate code.Ease of refactoring: refactoring tests is trivial when object interfaces change.Communication of intent: it is obvious from your code exactly what state is required in tests.The main benefits of using the builder pattern in your tests are: ![]() Gains from using the builder pattern in your tests The builder pattern avoids this, giving you a way to create objects quickly, cleanly and maintainably. These create a refactoring nightmare, and make it hard to understand what a test is testing and why. If you create objects manually each time, you find yourself repeating code, copy and pasting object set up from one test to another, and writing various hybrid createMyObject() functions in your unit tests. The pattern is particularly useful in unit tests because they require you to create objects over and over again, setting them into the right state for each test case. Introducing this separation allows you to: set defaults for the fields in an object override only values that need setting explicitly provide presets for complex object states and, easily create complex object graphs. The builder pattern is used for creating objects, separating their set up from their creation. The full example code used in this article can be found at. This article uses examples for iOS code using Swift, but they apply equally well to just about any language and platform. Finally I’ll show you how to create builder classes in your Xcode project. Then I’ll explain the gains you can make by using the pattern. I’ll start by talking about what the pattern is and why it is particularly useful in unit tests. In this article, I’m going to talk about how to leverage the builder pattern to make it more efficient for your team to write, review and maintain unit tests. Unit tests are essential for software projects, but they add overhead.
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