add test

hutool-core/src/test/java/cn/hutool/core/text/SplitUtilTest.java

@@ -0,0 +1,15 @@
+package cn.hutool.core.text;
+
+import cn.hutool.core.text.split.SplitUtil;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SplitUtilTest {
+
+	@Test
+	public void issueI6FKSITest(){
+		// issue:I6FKSI
+		Assert.assertThrows(IllegalArgumentException.class, () -> SplitUtil.splitByLength("test length 0", 0));
+	}
+
+}