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Testing BusySpinWaitStrategy Timing Behavior in LMAX-Exchange/disruptor

This test suite evaluates the BusySpinWaitStrategy implementation in the LMAX Disruptor library. It focuses on validating the busy-spin waiting mechanism, which is crucial for high-performance concurrent operations. The test ensures proper behavior of wait operations with specific timing constraints.

Test Coverage Overview

The test coverage focuses on the core waiting functionality of BusySpinWaitStrategy.

Key areas tested include:

Wait operation timing accuracy
Busy-spin behavior verification
Delay handling with 50ms threshold

Integration points primarily involve the WaitStrategyTestUtil helper class for assertion validation.

Implementation Analysis

The testing approach employs JUnit Jupiter framework with a focused single-method test strategy. The implementation uses a utility method assertWaitForWithDelayOf to validate the waiting behavior, demonstrating a clean separation of test logic and assertions.

Technical patterns include:

Direct instantiation of BusySpinWaitStrategy
Precise timing validation
Utility method abstraction for reusability

Technical Details

Testing tools and configuration:

JUnit Jupiter test framework
Custom WaitStrategyTestUtil support class
BusySpinWaitStrategy implementation
50ms delay parameter for timing verification
Exception handling for timing operations

Best Practices Demonstrated

The test exhibits several quality testing practices in concurrent system validation.

Notable practices include:

Isolated test scope
Clear test method naming
Abstracted assertion logic
Explicit timing parameters
Exception handling awareness

lmax-exchange/disruptor

src/test/java/com/lmax/disruptor/BusySpinWaitStrategyTest.java

            
/*
 * Copyright 2012 LMAX Ltd.
 *
 * 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.lmax.disruptor;

import org.junit.jupiter.api.Test;

import static com.lmax.disruptor.support.WaitStrategyTestUtil.assertWaitForWithDelayOf;

public class BusySpinWaitStrategyTest
{

    @Test
    public void shouldWaitForValue() throws Exception
    {
        assertWaitForWithDelayOf(50, new BusySpinWaitStrategy());
    }
}