如果你希望用 JUnit 来测试一些性能问题，那么 JUnitBenchmark 可以帮到你，主要特性：

• 记录执行时间
• 监控垃圾收集
• 测试热身

示例测试：

package org.javabenchmark;
 
import com.carrotsearch.junitbenchmarks.AbstractBenchmark;
import com.carrotsearch.junitbenchmarks.BenchmarkOptions;
import javolution.text.TextBuilder;
import org.junit.Test;
 
/**
 * Benchmark for String concatenation. Compares StringBUilder (JDK) and
 * TextBuilder (Javolution).
 */
public class StringConcatenationBenchmark extends AbstractBenchmark {
 
    public static final long LOOPS_COUNT = 10000000;
 
    @Test
    @BenchmarkOptions(benchmarkRounds = 3, warmupRounds = 1)
    public void stringBuilderBenchmark()  {
         
        StringBuilder builder = new StringBuilder();
        for (long i = 0; i < LOOPS_COUNT; i++) {
            builder.append('i').append(i);
        }
        System.out.println(builder.toString().length());
    }
     
    @Test
    @BenchmarkOptions(benchmarkRounds = 3, warmupRounds = 1)
    public void textBuilderBenchmark()  {
         
        TextBuilder builder = new TextBuilder();
        for (long i = 0; i < LOOPS_COUNT; i++) {
            builder.append('i').append(i);
        }
        System.out.println(builder.toString().length());
    }
}

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