Features

The Kotest plugin provided by Fixture Monkey allows you to enhance your testing experience within the Kotest framework.

• Replaces the default generator for generating random values for primitive types from Jqwik to Kotest's property generator (Arb). Use of bean validation annotations also works.
• Support for Kotest's property-based testing functions, including forAll and checkAll.

tip

Adding the Kotest Plugin doesn't mean you have to use Kotest as your testing framework. You can still use JUnit.

Dependencies

Gradle

testImplementation("com.navercorp.fixturemonkey:fixture-monkey-kotest:1.1.18")

Maven

<dependency>
  <groupId>com.navercorp.fixturemonkey</groupId>
  <artifactId>fixture-monkey-kotest</artifactId>
  <version>1.1.18</version>
  <scope>test</scope>
</dependency>

Setup

val fixtureMonkey = FixtureMonkey.builder()
    .plugin(KotestPlugin())
    .plugin(KotlinPlugin())
    .build()

Usage

Basic Object Generation

data class Product(
    val id: Long,
    val name: String,
    val price: Int
)

val product: Product = fixtureMonkey.giveMeOne()

Using with Kotest Property Testing

The Kotest plugin integrates with Kotest's property-based testing functions:

class ProductTest : StringSpec({
    val fixtureMonkey = FixtureMonkey.builder()
        .plugin(KotestPlugin())
        .plugin(KotlinPlugin())
        .build()

    "product name should not be blank after trim" {
        checkAll(fixtureMonkey.giveMeArb<Product>()) { product ->
            // property-based test with Fixture Monkey generated data
            product.id shouldNotBe null
        }
    }
})

Using with Bean Validation

Bean validation annotations work with the Kotest plugin:

data class Order(
    @field:Min(1)
    val quantity: Int,

    @field:NotBlank
    val customerName: String,

    @field:Positive
    val price: Long
)

val fixtureMonkey = FixtureMonkey.builder()
    .plugin(KotestPlugin())
    .plugin(KotlinPlugin())
    .plugin(JakartaValidationPlugin())
    .build()

val order: Order = fixtureMonkey.giveMeOne()
// order.quantity >= 1, order.customerName is not blank, order.price > 0

When to Use KotestPlugin vs JqwikPlugin

Feature	KotestPlugin	JqwikPlugin (default)
Random value generator	Kotest Arb	Jqwik
Property testing integration	checkAll, forAll	Jqwik @Property
Recommended for	Kotest users	JUnit users
Bean validation support	Yes	Yes