diff --git a/io.openems.edge.scheduler.allalphabetically/test/io/openems/edge/scheduler/allalphabetically/SchedulerAllAlphabeticallyImplTest.java b/io.openems.edge.scheduler.allalphabetically/test/io/openems/edge/scheduler/allalphabetically/SchedulerAllAlphabeticallyImplTest.java
index d70d542d30b..204e4e48109 100644
--- a/io.openems.edge.scheduler.allalphabetically/test/io/openems/edge/scheduler/allalphabetically/SchedulerAllAlphabeticallyImplTest.java
+++ b/io.openems.edge.scheduler.allalphabetically/test/io/openems/edge/scheduler/allalphabetically/SchedulerAllAlphabeticallyImplTest.java
@@ -2,7 +2,9 @@
 
 import static org.junit.Assert.assertEquals;
 
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import org.junit.Test;
@@ -25,7 +27,7 @@ public class SchedulerAllAlphabeticallyImplTest {
 	private static final String CTRL4_ID = "ctrl4";
 
 	@Test
-	public void test() throws Exception {
+	public void testWithFixedPriorities() throws Exception {
 		final SchedulerAllAlphabetically sut = new SchedulerAllAlphabeticallyImpl();
 		new ComponentTest(sut) //
 				.addReference("componentManager", new DummyComponentManager()) //
@@ -36,15 +38,55 @@ public void test() throws Exception {
 				.addComponent(new DummyController(CTRL4_ID)) //
 				.activate(MyConfig.create() //
 						.setId(SCHEDULER_ID) //
-						.setControllersIds(CTRL2_ID, CTRL1_ID) //
+						.setControllersIds(CTRL2_ID, CTRL1_ID, "") //
 						.build())
-				.next(new TestCase());
+				.next(new TestCase()) //
+				.deactivate();
 
 		assertEquals(//
 				Arrays.asList(CTRL2_ID, CTRL1_ID, CTRL0_ID, CTRL3_ID, CTRL4_ID), //
 				getControllerIds(sut));
 	}
 
+	@Test
+	public void testOnlyAlphabeticalOrdering() throws Exception {
+		final var controllerIds = new ArrayList<>(List.of(//
+				"ctrlController1", //
+				"a", //
+				"aa", //
+				"aA", //
+				"ab", //
+				"aB", //
+				"A", //
+				"0", //
+				"1", //
+				"0controller", //
+				"0Controller", //
+				"bla", //
+				"controller0", //
+				"controller1", //
+				"dontroller0", //
+				"dontroller1", //
+				"d0", //
+				"D0", //
+				"Z", //
+				"z"));
+		final var sut = new SchedulerAllAlphabeticallyImpl();
+		final var test = new ComponentTest(sut); //
+		controllerIds.forEach(controllerId -> test.addComponent(new DummyController(controllerId)));
+		test //
+				.addReference("componentManager", new DummyComponentManager()) //
+				.activate(MyConfig.create() //
+						.setId(SCHEDULER_ID) //
+						.setControllersIds() //
+						.build()) //
+				.next(new TestCase());
+
+		Collections.sort(controllerIds);
+
+		assertEquals(controllerIds, getControllerIds(sut));
+	}
+
 	private static List<String> getControllerIds(Scheduler scheduler) throws OpenemsNamedException {
 		return scheduler.getControllers().stream() //
 				.toList();