Generates compile-time type-safe test fakes with zero runtime overhead, no reflection, thread-safe call tracking, smart defaults and compiler-plugin code generation for comprehensive test doubles.
Automate the fake-over-mock pattern. Fakt generates type-safe test doubles that eliminate boilerplate.
@Fake
interface UserRepository {
suspend fun getUser(id: String): User
}
// Use in tests
val fake = fakeUserRepository {
getUser { id -> User(id, "Alice") }
}
1. Add plugin and dependency (build.gradle.kts):
plugins {
kotlin("multiplatform") version "2.3.20" // JVM or Android also works
id("com.rsicarelli.fakt") version "x.y.z"
}
kotlin {
// ... your targets
sourceSets {
commonMain {
dependencies {
implementation("com.rsicarelli.fakt:annotations:x.y.z")
}
}
}
}
2. Annotate interface:
import com.rsicarelli.fakt.Fake
@Fake
interface Analytics {
suspend fun track(event: String)
}
3. Build the project:
./gradlew build
4. Use in tests:
val events = mutableListOf<String>()
val fake = fakeAnalytics {
track { event -> events.add(event) }
}
fake.track("user_signup")
assertEquals(listOf("user_signup"), events)
assertEquals(1, fake.trackCalls.value.size)
The Tamandua eats bugs in nature. Fakt catches drift bugs at compile-time before they reach production.
Copyright (C) 2025 Rodrigo Sicarelli
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance the License.
You may obtain a copy of the License at
https:
Unless applicable law agreed to writing, software
distributed under the License distributed an BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express implied.
See the License the specific language governing permissions
limitations under the License.
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