Index: trunk/test/unit/org/openstreetmap/josm/data/validation/tests/CycleDetectorTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/validation/tests/CycleDetectorTest.java	(revision 19062)
+++ trunk/test/unit/org/openstreetmap/josm/data/validation/tests/CycleDetectorTest.java	(revision 19062)
@@ -0,0 +1,41 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.data.validation.tests;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+import org.openstreetmap.josm.TestUtils;
+import org.openstreetmap.josm.data.osm.DataSet;
+import org.openstreetmap.josm.io.OsmReader;
+import org.openstreetmap.josm.testutils.annotations.BasicPreferences;
+
+/**
+ * JUnit test for {@link CycleDetector} validation test.
+ */
+@BasicPreferences
+class CycleDetectorTest {
+
+    @Test
+    void testCycleDetection() throws Exception {
+        CycleDetector cycleDetector = new CycleDetector();
+        DataSet ds = OsmReader.parseDataSet(TestUtils.getRegressionDataStream(21881, "CycleDetector_test_wikipedia.osm"), null);
+        cycleDetector.startTest(null);
+        cycleDetector.visit(ds.allPrimitives());
+        cycleDetector.endTest();
+
+        // we have 4 cycles in the test file
+        assertEquals(4, cycleDetector.getErrors().size());
+    }
+
+    @Test
+    void testNotConsecutive() throws Exception {
+        CycleDetector cycleDetector = new CycleDetector();
+        DataSet ds = OsmReader.parseDataSet(TestUtils.getRegressionDataStream(21881, "not_consecutive.osm"), null);
+        cycleDetector.startTest(null);
+        cycleDetector.visit(ds.allPrimitives());
+        cycleDetector.endTest();
+
+        // we have 1 cycles in the test file
+        assertEquals(1, cycleDetector.getErrors().size());
+    }
+}