Failed to run unit test of java code in kotling spring project

Question

so I'm trying to do a unit testing java codes using Junit in a spring boot kotlin project, the codes are as following.

class JavaTestClass {

@Test
void javaTest(){
    List<String> mylist = getStringList();
}


List<String> getStringList() {
    ArrayList<String> stringList = new ArrayList<String>(List.of(new String[]{"Apple", "Banana", "Cherry",""}));

    ArrayList<String> withoutBlank = new ArrayList(stringList.stream().filter(f -> !f.isBlank()).collect(Collectors.toList()));

    return withoutBlank;
}

}

which is just a test for removing blanks from a list. This code runs without a problem when i test it in a java project, but when i test it in a kotlin project, it shows the error below.

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':test'.

No tests found for given includes: ...packagename

• Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

---

this is my build.gradle.kts file looks like

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile



plugins {
    id("org.springframework.boot") version "2.6.6"
    id("io.spring.dependency-management") version "1.0.11.RELEASE"
    kotlin("jvm") version "1.6.10"
    kotlin("plugin.spring") version "1.6.10"
}

group = "com.fullstack.kotlin.spring"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_16


repositories {
    mavenCentral()
}




dependencies {
    implementation("org.springframework.boot:spring-boot-starter-web")

    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
//  providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")
    //coroutine

    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.1")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor:1.6.1")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
    runtimeOnly ("com.h2database:h2")
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "16"
    }
}

tasks.withType<Test> {
    useJUnitPlatform()
}

Is there anyhthing im missing, or needed to add in order to do unit test with java in kotlin project