As title! I can't run any tests that are using MockK, as they end up throwing a StackOverflowError during initialisation.
As an example, here's one of my test classes:
@ExtendWith(MockKExtension::class)
class DBSequencesServicesTest {
private lateinit var service: DBSequencesService
@MockK
private lateinit var sequencesRepo: DBSequencesRepo
@BeforeTest
fun initService() {
service = DBSequencesServiceImpl(sequencesRepo)
}
@Test
fun `should return value 0 if given a non-existent sequence`() {
every { sequencesRepo.findById(any()) } returns Optional.empty()
assertEquals(0, service.nextValue("test"))
}
@Test
fun `should return next value if given an existing sequence`() {
every { sequencesRepo.findById("test") } returns Optional.of(DBSequence("test", 1))
every { sequencesRepo.save(any()) } returnsArgument 0
assertEquals(1, service.nextValue("test"))
}
@Test
fun `successive calls should return incrementing values`() {
every { sequencesRepo.findById("test") } returnsMany listOf(
Optional.of(DBSequence("test", 0)),
Optional.of(DBSequence("test", 1)),
Optional.of(DBSequence("test", 2))
)
every { sequencesRepo.save(any()) } returnsArgument 0
for (i in 0L..2L) {
assertEquals(i, service.nextValue("test"))
}
}
}
And this is the stack trace that results, cut off once the pattern becomes apparent:
Exception in thread "Test worker" java/lang/StackOverflowError
at io/mockk/proxy/jvm/dispatcher/JvmMockKDispatcher.get (JvmMockKDispatcher.java:16)
at java/lang/Object.hashCode (Object.java:119)
at java/util/HashMap.hash (HashMap.java:339)
at java/util/HashMap.get (HashMap.java:557)
at sun/reflect/Reflection.filterMethods (Reflection.java:291)
at java/lang/Class.getMethodHelper (Class.java:1265)
at java/lang/Class.getMethod (Class.java:1191)
at java/lang/Object.hashCode (Object.java:119)
at java/util/HashMap.hash (HashMap.java:339)
at java/util/HashMap.get (HashMap.java:557)
at sun/reflect/Reflection.filterMethods (Reflection.java:291)
at java/lang/Class.getMethodHelper (Class.java:1265)
at java/lang/Class.getMethod (Class.java:1191)
at java/lang/Object.hashCode (Object.java:119)
at java/util/HashMap.hash (HashMap.java:339)
at java/util/HashMap.get (HashMap.java:557)
at sun/reflect/Reflection.filterMethods (Reflection.java:291)
at java/lang/Class.getMethodHelper (Class.java:1265)
at java/lang/Class.getMethod (Class.java:1191)
at java/lang/Object.hashCode (Object.java:119)
at java/util/HashMap.hash (HashMap.java:339)
at java/util/HashMap.get (HashMap.java:557)
...
There's then a MessageIOException thrown:
org.gradle.internal.remote.internal.MessageIOException: Could not read message from '/127.0.0.1:52775'.
at org.gradle.internal.remote.internal.inet.SocketConnection.receive(SocketConnection.java:94)
at org.gradle.internal.remote.internal.hub.MessageHub$ConnectionReceive.run(MessageHub.java:270)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
at java.lang.Thread.run(Thread.java:821)
So far as I can tell I've set up MockK correctly and am using it according to their guides:
dependencies {
// Other dependencies go here...
testImplementation("org.springframework.boot:spring-boot-starter-test") {
exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
}
testImplementation("org.springframework.security:spring-security-test")
testImplementation("org.jetbrains.kotlin:kotlin-test-junit5:1.4.10")
testImplementation("io.mockk:mockk:1.10.2")
testImplementation("com.ninja-squad:springmockk:2.0.3")
}
What's causing that exception, and how can I resolve it? Let me know if more context is needed.
EDIT: The same exception does not occur when CircleCI runs the tests using the image cimg/openjdk:8.0
EDIT 2: Added definitions of DBSequence and DBSequenceRepo
@Document(collection = "dbSequences")
data class DBSequence(
@Id var name: String,
var nextVal: Long
) {
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (javaClass != other?.javaClass) return false
other as DBSequence
if (name != other.name) return false
return true
}
override fun hashCode(): Int {
return name.hashCode()
}
}
interface DBSequencesRepo : MongoRepository<DBSequence, String>
