警告：ID为'spek2'的TestEngine无法通过Gradle v5.2.1发现测试

Question

将Spek 2与Gradle Kotlin DSL一起使用时存在一些问题。当我右键单击我的测试文件夹并单击run all tests时，出现此错误：WARNING: TestEngine with ID 'spek2' failed to discover tests。我是否在错误地构建脚本？这在子项目中。

//subproject build.gradle.kts
plugins {
    kotlin("jvm")
    java
}

dependencies {
    testImplementation(kotlin("reflect", Vof.kotlin))
    testImplementation(kotlin("test", Vof.kotlin))
    testImplementation(group = "org.spekframework.spek2", name = "spek-dsl-jvm", version = Vof.spek) {
        exclude(group = "org.jetbrains.kotlin")
    }
    testRuntimeOnly(group = "org.spekframework.spek2", name = "spek-runner-junit5", version = Vof.spek) {
        exclude(group = "org.jetbrains.kotlin")
        exclude(group = "org.junit.platform")
    }
    testRuntimeOnly("org.junit.platform:junit-platform-launcher:${Vof.junitPlatform}")
    testImplementation(gradleTestKit())
}

tasks {
    named<Test>("test") {
        useJUnitPlatform {
            includeEngines("spek2")
        }
    }
}

我也使用了教程中的格式进行了尝试：

tasks {
    test {
        useJUnitPlatform {
            includeEngines("spek2")
        }
    }
}

，但是具有相同的错误。 Spek由于某种原因无法找到测试。有什么想法吗？

编辑：这是完整的堆栈跟踪

Feb 24, 2019 9:41:07 PM org.junit.platform.launcher.core.DefaultLauncher handleThrowable
WARNING: TestEngine with ID 'spek2' failed to discover tests
java.lang.IllegalStateException: clz.java.`package` must not be null
    at org.spekframework.spek2.runtime.scope.PathBuilder$Companion.from(Path.kt:86)
    at org.spekframework.spek2.runtime.SpekRuntime.discover(SpekJvmRuntime.kt:30)
    at org.spekframework.spek2.junit.SpekTestEngine.discover(SpekTestEngine.kt:76)
    at org.junit.platform.launcher.core.DefaultLauncher.discoverEngineRoot(DefaultLauncher.java:177)
    at org.junit.platform.launcher.core.DefaultLauncher.discoverRoot(DefaultLauncher.java:164)
    at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:120)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:52)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

更新：这被确定为漏洞，已在Spek 2.0.1中修复。