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This commit is contained in:
Ilkka Seppälä
2024-06-08 19:54:44 +03:00
committed by GitHub
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commit 6cd2d0353a
219 changed files with 3308 additions and 2819 deletions
+18 -16
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@@ -1,24 +1,26 @@
---
title: Arrange/Act/Assert
title: "Arrange/Act/Assert Pattern in Java: Enhance Testing Clarity and Simplicity"
shortTitle: Arrange/Act/Assert
description: "Learn how to use the Arrange/Act/Assert pattern to structure your unit tests in Java. Improve readability and maintainability of your code with clear testing phases."
category: Testing
language: en
tag:
- Code simplification
- Isolation
- Testing
- Code simplification
- Isolation
- Testing
---
## Also known as
* Given/When/Then
## Intent
## Intent of Arrange/Act/Assert Design Pattern
To structure unit tests clearly by dividing them into three distinct sections: setup (Arrange), execution (Act), and verification (Assert).
The Arrange/Act/Assert pattern is essential in unit testing in Java. This testing method structures unit tests clearly by dividing them into three distinct sections: setup (Arrange), execution (Act), and verification (Assert).
## Explanation
## Detailed Explanation of Arrange/Act/Assert Pattern with Real-World Examples
Real world example
Real-world example
> Imagine you are organizing a small event. To ensure everything runs smoothly, you follow a pattern similar to Arrange/Act/Assert:
>
@@ -36,9 +38,9 @@ WikiWikiWeb says
> Arrange/Act/Assert is a pattern for arranging and formatting code in UnitTest methods.
**Programmatic Example**
## Programmatic Example of Arrange/Act/Assert Pattern in Java
We need to write comprehensive and clear unit test suite for a class.
We need to write comprehensive and clear unit test suite for a class. Using the Arrange/Act/Assert pattern in Java testing ensures clarity.
Let's first introduce our `Cash` class to be unit tested.
@@ -121,19 +123,19 @@ class CashAAATest {
}
```
## Applicability
## When to Use the Arrange/Act/Assert Pattern in Java
Use Arrange/Act/Assert pattern when
* Unit testing, especially within the context of TDD and BDD
* Anywhere clarity and structure are needed in test cases
## Known uses
## Real-World Applications of Arrange/Act/Assert Pattern in Java
* Widely adopted in software projects using TDD and BDD methodologies.
* This pattern is particularly useful when practicing TDD and/or BDD methodologies in Java.
* Utilized in various programming languages and testing frameworks, such as JUnit (Java), NUnit (.NET), and xUnit frameworks.
## Consequences
## Benefits and Trade-offs of Arrange/Act/Assert Pattern
Benefits:
@@ -146,11 +148,11 @@ Trade-offs:
* May introduce redundancy in tests, as similar arrangements may be repeated across tests.
* Some complex tests might not fit neatly into this structure, requiring additional context or setup outside these three phases.
## Related patterns
## Related Java Design Patterns
* [Page Object](https://java-design-patterns.com/patterns/page-object/): A pattern for organizing UI tests that can be used in conjunction with Arrange/Act/Assert.
## Credits
## References and Credits
* [The Art of Unit Testing: with examples in C#](https://amzn.to/49IbdwO)
* [Test Driven Development: By Example](https://amzn.to/3wEwKbF)