Index: src/test/java/org/apache/jackrabbit/oak/util/ApproximateCounterTest.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/test/java/org/apache/jackrabbit/oak/util/ApproximateCounterTest.java	(revision 1671809)
+++ src/test/java/org/apache/jackrabbit/oak/util/ApproximateCounterTest.java	(revision )
@@ -16,14 +16,46 @@
  */
 package org.apache.jackrabbit.oak.util;
 
+import static org.apache.jackrabbit.oak.plugins.memory.EmptyNodeState.EMPTY_NODE;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
 import java.util.Random;
 
+import org.apache.jackrabbit.oak.NodeStoreFixture;
+import org.apache.jackrabbit.oak.OakBaseTest;
+import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
 import org.junit.Test;
 
-public class ApproximateCounterTest {
+public class ApproximateCounterTest extends OakBaseTest {
+
+    public static final long COUNT_SYNC_TEST_COUNT = 100;
+    public static final long COUNT_SYNC_ADJUST_INVOCATIONS_COUNT = 1000;
+
+    public ApproximateCounterTest(NodeStoreFixture fixture) {
+        super(fixture);
+    }
+
+    @Test
+    public void adjustCountSync() {
+        int exceedingCounts = 0;
+
+        for (int testIdx = 0 ; testIdx < COUNT_SYNC_TEST_COUNT ; testIdx ++) {
+            NodeBuilder mockNodeBuilder = EMPTY_NODE.builder();
+
+            for (int i = 0 ; i < COUNT_SYNC_ADJUST_INVOCATIONS_COUNT ; i++) {
+                ApproximateCounter.adjustCountSync(mockNodeBuilder, 1);
+            }
+
+            long count = ApproximateCounter.getCountSync(mockNodeBuilder.getNodeState());
+
+            if (count > 2 * COUNT_SYNC_ADJUST_INVOCATIONS_COUNT) {
+                exceedingCounts ++;
+            }
+        }
+
+        assertEquals("Returned count exceeds 2 X invocations count!", 0, exceedingCounts);
+    }
 
     @Test
     public void veryHighResolution() {