diff --git a/common/src/test/java/org/apache/hertzbeat/common/util/StrBufferTest.java b/common/src/test/java/org/apache/hertzbeat/common/util/StrBufferTest.java
new file mode 100644
index 00000000000..ff1e117e50e
--- /dev/null
+++ b/common/src/test/java/org/apache/hertzbeat/common/util/StrBufferTest.java
@@ -0,0 +1,152 @@
+/*
+ * 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.hertzbeat.common.util;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * test case for {@link StrBuffer}
+ */
+
+class StrBufferTest {
+
+	private static final String POSITIVE_INF = "+inf";
+	private static final String NEGATIVE_INF = "-inf";
+	private static final long POSITIVE_INF_VALUE = 0x7FF0000000000000L;
+	private static final long NEGATIVE_INF_VALUE = 0xFFF0000000000000L;
+
+	@Test
+	void testRead() {
+
+		StrBuffer buffer = new StrBuffer("hello");
+
+		assertEquals('h', buffer.read());
+		assertEquals('e', buffer.read());
+		assertEquals('l', buffer.read());
+		assertEquals('l', buffer.read());
+		assertEquals('o', buffer.read());
+		assertThrows(IndexOutOfBoundsException.class, buffer::read);
+	}
+
+	@Test
+	void testRollback() {
+
+		StrBuffer buffer = new StrBuffer("hello");
+
+		assertEquals('h', buffer.read());
+		buffer.rollback();
+		assertEquals('h', buffer.read());
+		buffer.read();
+		buffer.read();
+		buffer.rollback();
+		assertEquals('l', buffer.read());
+	}
+
+	@Test
+	void testCharAt() {
+
+		StrBuffer buffer = new StrBuffer("hello");
+
+		assertEquals('h', buffer.charAt(0));
+		assertEquals('e', buffer.charAt(1));
+		assertEquals('l', buffer.charAt(2));
+		assertEquals('l', buffer.charAt(3));
+		assertEquals('o', buffer.charAt(4));
+		assertThrows(IndexOutOfBoundsException.class, () -> buffer.charAt(5));
+	}
+
+	@Test
+	void testToStr() {
+
+		StrBuffer buffer = new StrBuffer("hello");
+
+		assertEquals("hello", buffer.toStr());
+		buffer.read();
+		assertEquals("ello", buffer.toStr());
+	}
+
+	@Test
+	void testToDouble() {
+
+		StrBuffer buffer = new StrBuffer("123.45");
+		assertEquals(123.45, buffer.toDouble());
+
+		buffer = new StrBuffer("+inf");
+		assertEquals(POSITIVE_INF_VALUE, buffer.toDouble());
+
+		buffer = new StrBuffer("-inf");
+		assertEquals(NEGATIVE_INF_VALUE, buffer.toDouble());
+	}
+
+	@Test
+	void testToLong() {
+
+		StrBuffer buffer = new StrBuffer("12345");
+		assertEquals(12345L, buffer.toLong());
+
+		buffer = new StrBuffer("+inf");
+		assertEquals(POSITIVE_INF_VALUE, buffer.toLong());
+
+		buffer = new StrBuffer("-inf");
+		assertEquals(NEGATIVE_INF_VALUE, buffer.toLong());
+	}
+
+	@Test
+	void testSkipBlankTabs() {
+
+		StrBuffer buffer = new StrBuffer("  \t  hello  \t  ");
+		buffer.skipBlankTabs();
+		assertEquals("hello", buffer.toStr());
+	}
+
+	@Test
+	void testIsEmpty() {
+
+		StrBuffer buffer = new StrBuffer("");
+		assertTrue(buffer.isEmpty());
+
+		buffer = new StrBuffer("  \t  ");
+		buffer.skipBlankTabs();
+		assertTrue(buffer.isEmpty());
+
+		buffer = new StrBuffer("hello");
+		assertFalse(buffer.isEmpty());
+	}
+
+	@Test
+	void testParseLong() {
+
+		assertEquals(12345L, StrBuffer.parseLong("12345"));
+		assertEquals(POSITIVE_INF_VALUE, StrBuffer.parseLong(POSITIVE_INF));
+		assertEquals(NEGATIVE_INF_VALUE, StrBuffer.parseLong(NEGATIVE_INF));
+	}
+
+	@Test
+	void testParseDouble() {
+
+		assertEquals(123.45, StrBuffer.parseDouble("123.45"));
+		assertEquals(POSITIVE_INF_VALUE, StrBuffer.parseDouble("+inf"));
+		assertEquals(NEGATIVE_INF_VALUE, StrBuffer.parseDouble("-inf"));
+	}
+
+}