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Testing Topology Graph Management in CAT

A comprehensive test suite for validating the topology graph functionality in the CAT monitoring system. This test suite focuses on verifying the persistence and retrieval of topology graph data across multiple time intervals.

Test Coverage Overview

The test suite provides thorough coverage of the TopologyGraphManager’s data retrieval capabilities.

Key areas tested include:

Sequential topology graph generation for 10-minute intervals
Database query operations for specific timestamps
File system persistence of topology data
Error handling for null graph scenarios

Implementation Analysis

The testing approach employs JUnit framework with ComponentTestCase as the base class for dependency injection support.

Implementation features:

Timestamp-based test iterations
File I/O operations verification
Error handling validation
Component lookup pattern for manager instantiation

Technical Details

Testing infrastructure includes:

JUnit 4.x test framework
Unidal component framework for dependency injection
SimpleDateFormat for timestamp handling
File I/O utilities from Unidal helper classes
Custom TopologyGraphManager for graph operations

Best Practices Demonstrated

The test implementation showcases several testing best practices.

Notable elements include:

Systematic time-series testing approach
Proper exception handling and logging
Clean separation of test setup and execution
Effective use of dependency injection for component testing
Consistent error reporting methodology

dianping/cat

cat-home/src/test/java/com/dianping/cat/report/analyzer/TopologyGraphTest.java

            
/*
 * Copyright (c) 2011-2018, Meituan Dianping. All Rights Reserved.
 *
 * 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 com.dianping.cat.report.analyzer;

import java.io.File;
import java.text.SimpleDateFormat;

import org.junit.Test;
import org.unidal.helper.Files;
import org.unidal.lookup.ComponentTestCase;

import com.dianping.cat.home.dependency.graph.entity.TopologyGraph;
import com.dianping.cat.report.page.dependency.graph.TopologyGraphManager;

public class TopologyGraphTest extends ComponentTestCase {

	@Test
	public void test() throws Exception {
		build("2014-07-06 18:00");
		build("2014-07-06 18:01");
		build("2014-07-06 18:02");
		build("2014-07-06 18:03");
		build("2014-07-06 18:04");
		build("2014-07-06 18:05");
		build("2014-07-06 18:06");
		build("2014-07-06 18:07");
		build("2014-07-06 18:08");
		build("2014-07-06 18:09");
	}

	public void build(String date) throws Exception {
		TopologyGraphManager manager = lookup(TopologyGraphManager.class);
		SimpleDateFormat formate = new SimpleDateFormat("yyyy-MM-dd HH:mm");
		try {
			TopologyGraph graph = manager.queryGraphFromDB(formate.parse(date).getTime());

			if (graph != null) {
				File file = new File("/tmp/" + date + ".txt");

				if (!file.exists()) {
					file.createNewFile();
				}
				Files.forIO().writeTo(file, graph.toString());
			} else {
				System.err.println(date + " is null1");
			}
		} catch (Exception e) {
			System.err.println(date + " is null1");
		}
	}

}