Junit5 test suite with Kotlin - unit-testing

Question

Based on answer in this link, created a test suite with Test classes
#RunWith(Suite::class)
#Suite.SuiteClasses(
DTOtoEntityMapperTest::class,
PostDataSourceCoroutinesTest::class,
PostDataSourceRxJava3Test::class
)
class JUnit5TestSuite
Returns error
org.junit.runners.model.InvalidTestClassError: Invalid test class 'com.x.DTOtoEntityMapperTest':
1. No runnable methods
But every test class added has test methods and runs individually for instance
class DTOtoEntityMapperTest {
private val postDTOList by lazy {
convertFromJsonToObjectList<PostDTO>(getResourceAsText(RESPONSE_JSON_PATH))!!
}
private val postEntityList by lazy {
convertFromJsonToObjectList<PostEntity>(getResourceAsText(RESPONSE_JSON_PATH))!!
}
#Test
fun `given PostDTO is input, should return PostEntity`() {
val mapper = DTOtoEntityMapper()
// GIVEN
val expected = postEntityList
// WHEN
val actual = mapper.map(postDTOList)
// THEN
Truth.assertThat(actual).containsExactlyElementsIn(expected)
}
}

Answer 1

You can now run Suites purely with jUnit 5 engines:
import org.junit.platform.suite.api.SelectClasses
import org.junit.platform.suite.api.Suite
#Suite
#SelectClasses(BasicMockKUnitTest::class, HierarchicalMockKUnitTest::class)
#SelectPackages("exercise")
class TestAllSelectPackage {
}
You'll have to import the junit-platform-suite-engine:
https://search.maven.org/artifact/org.junit.platform/junit-platform-suite-engine
There's some docs here:
https://junit.org/junit5/docs/snapshot/user-guide/#launcher-api-engines-custom
https://junit.org/junit5/docs/snapshot/api/org.junit.platform.suite.engine/org/junit/platform/suite/engine/package-summary.html
Here's an official example:
https://github.com/junit-team/junit5/blob/main/documentation/src/test/java/example/SuiteDemo.java

Answer 2

For JUnit 5 I used JUnitPlatform and SelectClasses (or SelectPackages):
#RunWith(JUnitPlatform::class)
#SelectClasses(Some1Test::class, Some2Test::class)
class SuiteTest

Answer 3

After checking for a few days, I found correctly libs to use Junit 5 test suite with kotlin
In build.gradle, add 2 libs as below:
testImplementation ("org.junit.platform:junit-platform-suite-api:1.7.0")
testImplementation ("org.junit.platform:junit-platform-runner:1.2.0")
Then you can use test suite as below:
import org.junit.platform.runner.JUnitPlatform
import org.junit.platform.suite.api.SelectClasses
import org.junit.platform.suite.api.SelectPackages
import org.junit.runner.RunWith
#RunWith(JUnitPlatform::class)
#SelectClasses(BasicMockKUnitTest::class, HierarchicalMockKUnitTest::class)
#SelectPackages("exercise")
class TestAllSelectPackage {
}