flink-formats/flink-avro-confluent-registry/src/test/java/org/apache/flink/formats/avro/registry/confluent/ConfluentSchemaRegistryCoderTest.java

/*
 * 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
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 */

package org.apache.flink.formats.avro.registry.confluent;

import io.confluent.kafka.schemaregistry.client.MockSchemaRegistryClient;
import org.apache.avro.Schema;
import org.apache.avro.SchemaBuilder;
import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import static org.junit.Assert.assertEquals;

/**
 * Tests for {@link ConfluentSchemaRegistryCoder}.
 */
public class ConfluentSchemaRegistryCoderTest {

	@Test
	public void testSpecificRecordWithConfluentSchemaRegistry() throws Exception {
		MockSchemaRegistryClient client = new MockSchemaRegistryClient();

		Schema schema = SchemaBuilder.record("testRecord")
			.fields()
			.optionalString("testField")
			.endRecord();
		int schemaId = client.register("testTopic", schema);

		ConfluentSchemaRegistryCoder registryCoder = new ConfluentSchemaRegistryCoder(client);
		ByteArrayOutputStream byteOutStream = new ByteArrayOutputStream();
		DataOutputStream dataOutputStream = new DataOutputStream(byteOutStream);
		dataOutputStream.writeByte(0);
		dataOutputStream.writeInt(schemaId);
		dataOutputStream.flush();

		ByteArrayInputStream byteInStream = new ByteArrayInputStream(byteOutStream.toByteArray());
		Schema readSchema = registryCoder.readSchema(byteInStream);

		assertEquals(schema, readSchema);
		assertEquals(0, byteInStream.available());
	}

	@Test(expected = IOException.class)
	public void testMagicByteVerification() throws Exception {
		MockSchemaRegistryClient client = new MockSchemaRegistryClient();
		int schemaId = client.register("testTopic", Schema.create(Schema.Type.BOOLEAN));

		ConfluentSchemaRegistryCoder coder = new ConfluentSchemaRegistryCoder(client);
		ByteArrayOutputStream byteOutStream = new ByteArrayOutputStream();
		DataOutputStream dataOutputStream = new DataOutputStream(byteOutStream);
		dataOutputStream.writeByte(5);
		dataOutputStream.writeInt(schemaId);
		dataOutputStream.flush();

		ByteArrayInputStream byteInStream = new ByteArrayInputStream(byteOutStream.toByteArray());
		coder.readSchema(byteInStream);

		// exception is thrown
	}

}