如何在每个 TestCase 之间延迟执行 JUnit TestSuite？

import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;

public class DelayRule implements TestRule {
    private final long delay;

    public DelayRule(long delay) {
        this.delay = delay;
    }

    @Override
    public Statement apply(Statement base, Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                try {
                    Thread.sleep(delay);
                    base.evaluate();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
    }
}

import org.junit.Rule;
import org.junit.rules.TestRule;
import org.junit.runner.RunWith;
import org.junit.runners.Suite;

@RunWith(Suite.class)
@Suite.SuiteClasses({TestCase1.class, TestCase2.class, TestCase3.class})
public class TestSuite {
    @Rule
    public TestRule delayRule = new DelayRule(1000); // 延迟1秒

    // 其他代码
}