quarkusDev is not running tests

New to Quarkus here. Trying the hello world application in Kotlin and gradle. It runs fine, however, 'quarkusDev' doesn't seem to find any of the tests in src/test/kotlin/... folder.

Pressing 'r' in the quarkusDev menu simply says 'No tests found'. Running './gradlew clean test' does run the tests though.

my build.gradle:

plugins {
    id 'org.jetbrains.kotlin.jvm' version "1.5.0"
    id "org.jetbrains.kotlin.plugin.allopen" version "1.5.0"
    id 'io.quarkus'
}

repositories {
    mavenLocal()
    mavenCentral()
}

dependencies {
    implementation 'io.quarkus:quarkus-container-image-jib'
    implementation enforcedPlatform("${quarkusPlatformGroupId}:${quarkusPlatformArtifactId}:${quarkusPlatformVersion}")
    implementation 'io.quarkus:quarkus-resteasy-reactive-jackson'
    implementation 'io.quarkus:quarkus-resteasy-reactive'
    implementation 'io.quarkus:quarkus-kotlin'
    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core'
    implementation 'com.opencsv:opencsv:5.5.2'

    implementation 'io.quarkus:quarkus-arc'
    testImplementation 'io.quarkus:quarkus-junit5'
    testImplementation 'io.rest-assured:rest-assured'
}

group 'com.testgroup'
version '0.0.0'

java {
    sourceCompatibility = JavaVersion.VERSION_11
    targetCompatibility = JavaVersion.VERSION_11
}

allOpen {
    annotation("javax.ws.rs.Path")
    annotation("javax.enterprise.context.ApplicationScoped")
    annotation("io.quarkus.test.junit.QuarkusTest")
}

compileKotlin {
    kotlinOptions.jvmTarget = JavaVersion.VERSION_11
    kotlinOptions.javaParameters = true
}

compileTestKotlin {
    kotlinOptions.jvmTarget = JavaVersion.VERSION_11
}

Anyone has ideas?