Merge pull request #491 from scireum/feature/smo/migrateBackgorundLoo…

…pTest

jUnit: Migrates BackgroundLoop Tests to Kotlin

src/test/kotlin/sirius/kernel/async/BackgroundLoopTest.kt

@@ -0,0 +1,42 @@
+/*
+ * Made with all the love in the world
+ * by scireum in Remshalden, Germany
+ *
+ * Copyright by scireum GmbH
+ * http://www.scireum.de - info@scireum.de
+ */
+
+package sirius.kernel.async
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+import sirius.kernel.NightlyTest
+import sirius.kernel.SiriusExtension
+import sirius.kernel.commons.Wait
+import kotlin.test.assertTrue
+
+@NightlyTest
+@ExtendWith(SiriusExtension::class)
+class BackgroundLoopSpec {
+    @Test
+    fun `BackgroundLoop limits to max frequency`() {
+        val currentCounter = FastTestLoop.counter.toInt()
+        Wait.seconds(10.0)
+        val delta = FastTestLoop.counter.toInt() - currentCounter
+        //the background loop executed enough calls (should be 10 but we're a bit tolerant here)
+        assertTrue { delta >= 8 }
+        //the background loop was limited not to execute too often (should be 10 but we're a bit tolerant here)
+        assertTrue { delta <= 12 }
+    }
+
+    @Test
+    fun `BackgroundLoop executes as fast as possible if loop is slow`() {
+        val currentCounter = SlowTestLoop.counter.toInt()
+        Wait.seconds(10.0)
+        val delta = SlowTestLoop.counter.toInt() - currentCounter
+        //the background loop executed enough calls (should be 5 but we're a bit tolerant here)
+        assertTrue { delta >= 3 }
+        //the background loop was limited not to execute too often (should be 5 but we're a bit tolerant here)
+        assertTrue { delta <= 6 }
+    }
+}