diff --git a/eventmesh-runtime/src/test/java/org/apache/eventmesh/runtime/util/EventMeshCloudEventWriterTest.java b/eventmesh-runtime/src/test/java/org/apache/eventmesh/runtime/util/EventMeshCloudEventWriterTest.java
new file mode 100644
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+++ b/eventmesh-runtime/src/test/java/org/apache/eventmesh/runtime/util/EventMeshCloudEventWriterTest.java
@@ -0,0 +1,92 @@
+/*
+ * 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.eventmesh.runtime.util;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.charset.StandardCharsets;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.util.Map;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class EventMeshCloudEventWriterTest {
+
+    @Test
+    public void testURIAsValueWithContextAttribute() throws URISyntaxException {
+        String key = "testKey";
+        EventMeshCloudEventWriter eventMeshCloudEventWriter = new EventMeshCloudEventWriter();
+
+        eventMeshCloudEventWriter.withContextAttribute(key, new URI("file://foo/bars"));
+
+        Map<String, Object> extensionMap = eventMeshCloudEventWriter.getExtensionMap();
+        Assertions.assertEquals(extensionMap.get(key), "file://foo/bars");
+    }
+
+    @Test
+    public void testOffsetDateTimeAsValueWithContextAttribute() {
+        String key = "testKey";
+        EventMeshCloudEventWriter eventMeshCloudEventWriter = new EventMeshCloudEventWriter();
+
+        eventMeshCloudEventWriter.withContextAttribute(key, OffsetDateTime.of(LocalDateTime.of(
+            LocalDate.of(2023, 6, 17), LocalTime.MIDNIGHT), ZoneOffset.ofTotalSeconds(32400)));
+
+        Map<String, Object> extensionMap = eventMeshCloudEventWriter.getExtensionMap();
+        Assertions.assertEquals(extensionMap.get(key), "2023-06-17T00:00:00+09:00");
+    }
+
+    @Test
+    public void testIntegerAsValueWithContextAttribute() {
+        String key = "testKey";
+        EventMeshCloudEventWriter eventMeshCloudEventWriter = new EventMeshCloudEventWriter();
+
+        eventMeshCloudEventWriter.withContextAttribute(key, 123);
+
+        Map<String, Object> extensionMap = eventMeshCloudEventWriter.getExtensionMap();
+        Assertions.assertEquals(extensionMap.get(key), "123");
+    }
+
+    @Test
+    public void testBooleanAsValueWithContextAttribute() {
+        String key = "testKey";
+        EventMeshCloudEventWriter eventMeshCloudEventWriter = new EventMeshCloudEventWriter();
+
+        eventMeshCloudEventWriter.withContextAttribute(key, Boolean.FALSE);
+
+        Map<String, Object> extensionMap = eventMeshCloudEventWriter.getExtensionMap();
+        Assertions.assertEquals(extensionMap.get(key), "false");
+    }
+
+    @Test
+    public void testByteArrayAsValueWithContextAttribute() {
+        String key = "testKey";
+        EventMeshCloudEventWriter eventMeshCloudEventWriter = new EventMeshCloudEventWriter();
+
+        eventMeshCloudEventWriter.withContextAttribute(key, "bytesArray".getBytes(StandardCharsets.UTF_8));
+
+        Map<String, Object> extensionMap = eventMeshCloudEventWriter.getExtensionMap();
+        String base64EncodedValue = "Ynl0ZXNBcnJheQ==";
+        Assertions.assertEquals(extensionMap.get(key), base64EncodedValue);
+    }
+
+}