add test

hutool-core/src/test/java/cn/hutool/core/util/StrUtilTest.java

@@ -72,6 +72,14 @@ public class StrUtilTest {
 		Assert.assertEquals(2, strings.length);
 	}
 
+	@Test
+	public void splitEmptyTest() {
+		String str = "";
+		List<String> split = StrUtil.split(str, ',', -1, true, true);
+		// 测试空是否被去掉
+		Assert.assertEquals(0, split.size());
+	}
+
 	@Test
 	public void splitTest2() {
 		String str = "a.b.";