Back to Repositories

Testing Hystrix Command Fallback Implementation in Netflix/Hystrix

This test suite validates fallback functionality in Netflix Hystrix’s Java implementation using AspectJ weaving. It focuses on verifying command fallback behaviors and proper error handling mechanisms in a compile-time weaving environment.

Test Coverage Overview

The test suite provides comprehensive coverage of Hystrix command fallback scenarios.

Key areas tested include:

Basic command fallback functionality
Compile-time AspectJ weaving integration
UserService implementation verification
Error handling and recovery paths

Implementation Analysis

The testing approach leverages JUnit framework with AspectJ compile-time weaving mode. The test extends BasicCommandFallbackTest to inherit core fallback test scenarios while implementing environment-specific configurations. The pattern demonstrates separation of concerns between base test functionality and environment setup.

Technical implementation details:

AspectJ compile-time weaving configuration
Custom UserService instantiation
Inheritance-based test organization

Technical Details

Testing tools and configuration:

JUnit test framework
AspectJ compile-time weaver
System property configuration for weaving mode
Custom UserService implementation
Hystrix command configuration

Best Practices Demonstrated

The test implementation showcases several testing best practices for resilient microservices.

Notable practices include:

Clear separation of concerns between base and specific tests
Proper test environment configuration
Consistent service initialization patterns
Explicit weaving mode configuration
Clean inheritance structure

netflix/hystrix

hystrix-contrib/hystrix-javanica/src/ajcTest/java/com/netflix/hystrix/contrib/javanica/test/aspectj/fallback/CommandFallbackTest.java

            
/**
 * Copyright 2016 Netflix, Inc.
 *
 * Licensed 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.netflix.hystrix.contrib.javanica.test.aspectj.fallback;

import com.netflix.hystrix.contrib.javanica.test.common.fallback.BasicCommandFallbackTest;
import org.junit.BeforeClass;

/**
 * Created by dmgcodevil
 */
public class CommandFallbackTest extends BasicCommandFallbackTest {

    @BeforeClass
    public static void setUpEnv() {
        System.setProperty("weavingMode", "compile");
    }

    @Override
    protected UserService createUserService() {
        return new UserService();
    }
}