add test

hutool-core/src/test/java/cn/hutool/core/bean/Issue2649Test.java

@@ -0,0 +1,52 @@
+package cn.hutool.core.bean;
+
+import cn.hutool.core.date.StopWatch;
+import cn.hutool.core.lang.Console;
+import lombok.Data;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Issue2649Test {
+
+	@Test
+	@Ignore
+	public void toListTest() {
+		final List<View1> view1List = new ArrayList<>();
+		for (int i = 0; i < 200; i++) {
+			final View1 view1 = new View1();
+			view1.setA(String.valueOf(i));
+			view1.setB(String.valueOf(i));
+			for (int j = 0; j < 2; j++) {
+				final View2 view2 = new View2();
+				view1.setA(String.valueOf(i));
+				view1.setB(String.valueOf(i));
+				view1.getViewList().add(view2);
+			}
+			view1List.add(view1);
+		}
+
+		final StopWatch stopWatch = new StopWatch();
+		stopWatch.start();
+		@SuppressWarnings("unused")
+		final List<View2> view2s = BeanUtil.copyToList(view1List, View2.class);
+		stopWatch.stop();
+		Console.log(stopWatch.getTotalTimeSeconds());
+	}
+
+	@Data
+	static class View1{
+		private String a;
+		private String b;
+		private List<View2> viewList = new ArrayList<>();
+	}
+
+	@Data
+	static class View2{
+		private String a;
+		private String b;
+		private List<View2> viewList = new ArrayList<>();
+	}
+}