Age calculation using Kotlin extension function with JUnit 5 Tests

Video: Using Kotlin extension functions to calculate age with tests in JUnit 5

Demonstrates how to perform a date calculation to determine the age of a person in years using Kotlin extension functions. Kotlin's extension functions make it extremely convenient to attach the functionality to an existing LocalDate class that leads to very readable code.

This demo shows how to expose the age calculation as an extension function to the LocalDate class as well as how to test code that relies on the current date without creating brittle tests that pass one day anf dail the next without any code changes having taken place.

This demo depends on:

• Gradle (v 6.8.3)
• Kotlin (v 1.4.31)
• JUnit (v 5.7.1)
• JUnit Params (v 5.7.1)
• Strikt (v 0.29.0)

Building the code

To build the code, run:

./gradlew build

Running the tests

To run the tests:

./gradlew test