fix code

hutool-core/src/test/java/cn/hutool/core/date/StopWatchTest.java

@@ -0,0 +1,26 @@
+package cn.hutool.core.date;
+
+import cn.hutool.core.lang.Console;
+import cn.hutool.core.thread.ThreadUtil;
+import org.junit.Test;
+
+import java.util.concurrent.TimeUnit;
+
+public class StopWatchTest {
+
+	/**
+	 * https://gitee.com/dromara/hutool/issues/I6HSBG
+	 */
+	@Test
+	public void prettyPrintTest() {
+		final StopWatch stopWatch = new StopWatch();
+		stopWatch.start("任务1");
+		ThreadUtil.sleep(1);
+		stopWatch.stop();
+		stopWatch.start("任务2");
+		ThreadUtil.sleep(200);
+		stopWatch.stop();
+
+		Console.log(stopWatch.prettyPrint(TimeUnit.MILLISECONDS));
+	}
+}