kotlinx-coroutines-test/test/TestModuleHelpers.kt

/*
 * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

package kotlinx.coroutines.test

import kotlinx.coroutines.*
import org.junit.*
import java.time.*

const val SLOW = 10_000L

/**
 * Assert a block completes within a second or fail the suite
 */
suspend fun CoroutineScope.assertRunsFast(block: suspend CoroutineScope.() -> Unit) {
    val start = Instant.now().toEpochMilli()
    // don't need to be fancy with timeouts here since anything longer than a few ms is an error
    block()
    val duration = Instant.now().minusMillis(start).toEpochMilli()
    Assert.assertTrue("All tests must complete within 2000ms (use longer timeouts to cause failure)", duration < 2_000)
}