diff --git a/client/src/test/java/org/apache/rocketmq/client/latency/LatencyFaultToleranceImplTest.java b/client/src/test/java/org/apache/rocketmq/client/latency/LatencyFaultToleranceImplTest.java
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@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.rocketmq.client.latency;
+
+import java.util.concurrent.TimeUnit;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class LatencyFaultToleranceImplTest {
+    private LatencyFaultTolerance<String> latencyFaultTolerance;
+    private String brokerName = "BrokerA";
+    private String anotherBrokerName = "BrokerB";
+
+    @Before
+    public void init() {
+        latencyFaultTolerance = new LatencyFaultToleranceImpl();
+    }
+
+    @Test
+    public void testUpdateFaultItem() throws Exception {
+        latencyFaultTolerance.updateFaultItem(brokerName, 3000, 3000);
+        assertThat(latencyFaultTolerance.isAvailable(brokerName)).isFalse();
+        assertThat(latencyFaultTolerance.isAvailable(anotherBrokerName)).isTrue();
+    }
+
+    @Test
+    public void testIsAvailable() throws Exception {
+        latencyFaultTolerance.updateFaultItem(brokerName, 3000, 50);
+        assertThat(latencyFaultTolerance.isAvailable(brokerName)).isFalse();
+
+        TimeUnit.MILLISECONDS.sleep(70);
+        assertThat(latencyFaultTolerance.isAvailable(brokerName)).isTrue();
+    }
+
+    @Test
+    public void testRemove() throws Exception {
+        latencyFaultTolerance.updateFaultItem(brokerName, 3000, 3000);
+        assertThat(latencyFaultTolerance.isAvailable(brokerName)).isFalse();
+        latencyFaultTolerance.remove(brokerName);
+        assertThat(latencyFaultTolerance.isAvailable(brokerName)).isTrue();
+    }
+
+    @Test
+    public void testPickOneAtLeast() throws Exception {
+        latencyFaultTolerance.updateFaultItem(brokerName, 1000, 3000);
+        assertThat(latencyFaultTolerance.pickOneAtLeast()).isEqualTo(brokerName);
+
+        latencyFaultTolerance.updateFaultItem(anotherBrokerName, 1001, 3000);
+        assertThat(latencyFaultTolerance.pickOneAtLeast()).isEqualTo(brokerName);
+    }
+}
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