diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/text/StrUtilTest.java b/hutool-core/src/test/java/org/dromara/hutool/core/text/StrUtilTest.java
index 3ac1499ba..27a6cac1d 100644
--- a/hutool-core/src/test/java/org/dromara/hutool/core/text/StrUtilTest.java
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/text/StrUtilTest.java
@@ -24,6 +24,8 @@ import org.junit.jupiter.api.Test;
 
 import java.util.List;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 /**
  * 字符串工具类单元测试
  *
@@ -40,25 +42,25 @@ public class StrUtilTest {
 	public void trimTest() {
 		final String blank = "	 哈哈 　";
 		final String trim = StrUtil.trim(blank);
-		Assertions.assertEquals("哈哈", trim);
+		assertEquals("哈哈", trim);
 	}
 
 	@Test
 	public void trimNewLineTest() {
 		String str = "\r\naaa";
-		Assertions.assertEquals("aaa", StrUtil.trim(str));
+		assertEquals("aaa", StrUtil.trim(str));
 		str = "\raaa";
-		Assertions.assertEquals("aaa", StrUtil.trim(str));
+		assertEquals("aaa", StrUtil.trim(str));
 		str = "\naaa";
-		Assertions.assertEquals("aaa", StrUtil.trim(str));
+		assertEquals("aaa", StrUtil.trim(str));
 		str = "\r\n\r\naaa";
-		Assertions.assertEquals("aaa", StrUtil.trim(str));
+		assertEquals("aaa", StrUtil.trim(str));
 	}
 
 	@Test
 	public void trimTabTest() {
 		final String str = "\taaa";
-		Assertions.assertEquals("aaa", StrUtil.trim(str));
+		assertEquals("aaa", StrUtil.trim(str));
 	}
 
 	@Test
@@ -66,7 +68,7 @@ public class StrUtilTest {
 		// 包含：制表符、英文空格、不间断空白符、全角空格
 		final String str = "	 你 好　";
 		final String cleanBlank = StrUtil.cleanBlank(str);
-		Assertions.assertEquals("你好", cleanBlank);
+		assertEquals("你好", cleanBlank);
 	}
 
 	@Test
@@ -80,178 +82,177 @@ public class StrUtilTest {
 	public void splitTest2() {
 		final String str = "a.b.";
 		final List<String> split = SplitUtil.split(str, ".");
-		Assertions.assertEquals(3, split.size());
-		Assertions.assertEquals("b", split.get(1));
-		Assertions.assertEquals("", split.get(2));
+		assertEquals(3, split.size());
+		assertEquals("b", split.get(1));
+		assertEquals("", split.get(2));
 	}
 
 	@Test
 	public void splitNullTest() {
-		Assertions.assertEquals(0, SplitUtil.split(null, ".").size());
+		assertEquals(0, SplitUtil.split(null, ".").size());
 	}
 
 	@Test
 	public void formatTest() {
 		final String template = "你好，我是{name}，我的电话是：{phone}";
 		final String result = StrUtil.formatByMap(template, Dict.of().set("name", "张三").set("phone", "13888881111"));
-		Assertions.assertEquals("你好，我是张三，我的电话是：13888881111", result);
+		assertEquals("你好，我是张三，我的电话是：13888881111", result);
 
 		final String result2 = StrUtil.formatByMap(template, Dict.of().set("name", "张三").set("phone", null));
-		Assertions.assertEquals("你好，我是张三，我的电话是：{phone}", result2);
+		assertEquals("你好，我是张三，我的电话是：{phone}", result2);
 	}
 
 	@Test
 	public void stripTest() {
 		String str = "abcd123";
 		String strip = StrUtil.strip(str, "ab", "23");
-		Assertions.assertEquals("cd1", strip);
+		assertEquals("cd1", strip);
 
 		str = "abcd123";
 		strip = StrUtil.strip(str, "ab", "");
-		Assertions.assertEquals("cd123", strip);
+		assertEquals("cd123", strip);
 
 		str = "abcd123";
 		strip = StrUtil.strip(str, null, "");
-		Assertions.assertEquals("abcd123", strip);
+		assertEquals("abcd123", strip);
 
 		str = "abcd123";
 		strip = StrUtil.strip(str, null, "567");
-		Assertions.assertEquals("abcd123", strip);
+		assertEquals("abcd123", strip);
 
-		Assertions.assertEquals("", StrUtil.strip("a", "a"));
-		Assertions.assertEquals("", StrUtil.strip("a", "a", "b"));
+		assertEquals("", StrUtil.strip("a", "a"));
+		assertEquals("", StrUtil.strip("a", "a", "b"));
 	}
 
 	@Test
 	public void stripIgnoreCaseTest() {
 		String str = "abcd123";
 		String strip = StrUtil.stripIgnoreCase(str, "Ab", "23");
-		Assertions.assertEquals("cd1", strip);
+		assertEquals("cd1", strip);
 
 		str = "abcd123";
 		strip = StrUtil.stripIgnoreCase(str, "AB", "");
-		Assertions.assertEquals("cd123", strip);
+		assertEquals("cd123", strip);
 
 		str = "abcd123";
 		strip = StrUtil.stripIgnoreCase(str, "ab", "");
-		Assertions.assertEquals("cd123", strip);
+		assertEquals("cd123", strip);
 
 		str = "abcd123";
 		strip = StrUtil.stripIgnoreCase(str, null, "");
-		Assertions.assertEquals("abcd123", strip);
+		assertEquals("abcd123", strip);
 
 		str = "abcd123";
 		strip = StrUtil.stripIgnoreCase(str, null, "567");
-		Assertions.assertEquals("abcd123", strip);
+		assertEquals("abcd123", strip);
 	}
 
 	@Test
 	public void indexOfIgnoreCaseTest() {
-		Assertions.assertEquals(-1, StrUtil.indexOfIgnoreCase(null, "balabala", 0));
-		Assertions.assertEquals(-1, StrUtil.indexOfIgnoreCase("balabala", null, 0));
-		Assertions.assertEquals(0, StrUtil.indexOfIgnoreCase("", "", 0));
-		Assertions.assertEquals(0, StrUtil.indexOfIgnoreCase("aabaabaa", "A", 0));
-		Assertions.assertEquals(2, StrUtil.indexOfIgnoreCase("aabaabaa", "B", 0));
-		Assertions.assertEquals(1, StrUtil.indexOfIgnoreCase("aabaabaa", "AB", 0));
-		Assertions.assertEquals(5, StrUtil.indexOfIgnoreCase("aabaabaa", "B", 3));
-		Assertions.assertEquals(-1, StrUtil.indexOfIgnoreCase("aabaabaa", "B", 9));
-		Assertions.assertEquals(2, StrUtil.indexOfIgnoreCase("aabaabaa", "B", -1));
-		Assertions.assertEquals(-1, StrUtil.indexOfIgnoreCase("aabaabaa", "", 2));
-		Assertions.assertEquals(-1, StrUtil.indexOfIgnoreCase("abc", "", 9));
+		assertEquals(-1, StrUtil.indexOfIgnoreCase(null, "balabala", 0));
+		assertEquals(-1, StrUtil.indexOfIgnoreCase("balabala", null, 0));
+		assertEquals(0, StrUtil.indexOfIgnoreCase("", "", 0));
+		assertEquals(0, StrUtil.indexOfIgnoreCase("aabaabaa", "A", 0));
+		assertEquals(2, StrUtil.indexOfIgnoreCase("aabaabaa", "B", 0));
+		assertEquals(1, StrUtil.indexOfIgnoreCase("aabaabaa", "AB", 0));
+		assertEquals(5, StrUtil.indexOfIgnoreCase("aabaabaa", "B", 3));
+		assertEquals(-1, StrUtil.indexOfIgnoreCase("aabaabaa", "B", 9));
+		assertEquals(2, StrUtil.indexOfIgnoreCase("aabaabaa", "B", -1));
+		assertEquals(-1, StrUtil.indexOfIgnoreCase("aabaabaa", "", 2));
+		assertEquals(-1, StrUtil.indexOfIgnoreCase("abc", "", 9));
 	}
 
 	@Test
 	public void lastIndexOfTest() {
 		final String a = "aabbccddcc";
 		final int lastIndexOf = StrUtil.lastIndexOf(a, "c", 0, false);
-		Assertions.assertEquals(-1, lastIndexOf);
+		assertEquals(-1, lastIndexOf);
 	}
 
 	@Test
 	public void lastIndexOfIgnoreCaseTest() {
-		Assertions.assertEquals(-1, StrUtil.lastIndexOfIgnoreCase(null, "balabala", 0));
-		Assertions.assertEquals(-1, StrUtil.lastIndexOfIgnoreCase("balabala", null));
-		Assertions.assertEquals(0, StrUtil.lastIndexOfIgnoreCase("", ""));
-		Assertions.assertEquals(7, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "A"));
-		Assertions.assertEquals(5, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "B"));
-		Assertions.assertEquals(4, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "AB"));
-		Assertions.assertEquals(2, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "B", 3));
-		Assertions.assertEquals(5, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "B", 9));
-		Assertions.assertEquals(-1, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "B", -1));
-		Assertions.assertEquals(-1, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "", 2));
-		Assertions.assertEquals(-1, StrUtil.lastIndexOfIgnoreCase("abc", "", 9));
-		Assertions.assertEquals(0, StrUtil.lastIndexOfIgnoreCase("AAAcsd", "aaa"));
+		assertEquals(-1, StrUtil.lastIndexOfIgnoreCase(null, "balabala", 0));
+		assertEquals(-1, StrUtil.lastIndexOfIgnoreCase("balabala", null));
+		assertEquals(0, StrUtil.lastIndexOfIgnoreCase("", ""));
+		assertEquals(7, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "A"));
+		assertEquals(5, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "B"));
+		assertEquals(4, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "AB"));
+		assertEquals(2, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "B", 3));
+		assertEquals(5, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "B", 9));
+		assertEquals(-1, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "B", -1));
+		assertEquals(-1, StrUtil.lastIndexOfIgnoreCase("aabaabaa", "", 2));
+		assertEquals(-1, StrUtil.lastIndexOfIgnoreCase("abc", "", 9));
+		assertEquals(0, StrUtil.lastIndexOfIgnoreCase("AAAcsd", "aaa"));
 	}
 
 	@Test
 	public void replaceTest() {
 		String string = StrUtil.replaceByCodePoint("aabbccdd", 2, 6, '*');
-		Assertions.assertEquals("aa****dd", string);
+		assertEquals("aa****dd", string);
 		string = StrUtil.replaceByCodePoint("aabbccdd", 2, 12, '*');
-		Assertions.assertEquals("aa******", string);
+		assertEquals("aa******", string);
 
 		final String emoji = StrUtil.replaceByCodePoint("\uD83D\uDE00aabb\uD83D\uDE00ccdd", 2, 6, '*');
-		Assertions.assertEquals("\uD83D\uDE00a****ccdd", emoji);
+		assertEquals("\uD83D\uDE00a****ccdd", emoji);
 	}
 
 	@Test
 	public void replaceTest2() {
 		final String result = StrUtil.replace("123", "2", "3");
-		Assertions.assertEquals("133", result);
+		assertEquals("133", result);
 	}
 
 	@Test
 	public void replaceTest4() {
 		final String a = "1039";
 		final String result = StrUtil.padPre(a, 8, "0"); //在字符串1039前补4个0
-		Assertions.assertEquals("00001039", result);
+		assertEquals("00001039", result);
 
 		final String aa = "1039";
 		final String result1 = StrUtil.padPre(aa, -1, "0"); //在字符串1039前补4个0
-		Assertions.assertEquals("103", result1);
+		assertEquals("103", result1);
 	}
 
 	@Test
 	public void replaceTest5() {
 		final String a = "\uD853\uDC09秀秀";
 		final String result = StrUtil.replaceByCodePoint(a, 1, a.length(), '*');
-		Assertions.assertEquals("\uD853\uDC09**", result);
+		assertEquals("\uD853\uDC09**", result);
 
 		final String aa = "规划大师";
 		final String result1 = StrUtil.replaceByCodePoint(aa, 2, a.length(), '*');
-		Assertions.assertEquals("规划**", result1);
+		assertEquals("规划**", result1);
 	}
 
 	@Test
 	public void upperFirstTest() {
 		final StringBuilder sb = new StringBuilder("KEY");
 		final String s = StrUtil.upperFirst(sb);
-		Assertions.assertEquals(s, sb.toString());
+		assertEquals(s, sb.toString());
 	}
 
 	@Test
 	public void lowerFirstTest() {
 		final StringBuilder sb = new StringBuilder("KEY");
 		final String s = StrUtil.lowerFirst(sb);
-		Assertions.assertEquals("kEY", s);
+		assertEquals("kEY", s);
 	}
 
 	@Test
 	public void subTest() {
 		final String a = "abcderghigh";
 		final String pre = StrUtil.sub(a, -5, a.length());
-		Assertions.assertEquals("ghigh", pre);
+		assertEquals("ghigh", pre);
 	}
 
-	@SuppressWarnings("SimplifiableAssertion")
 	@Test
 	public void subPreTest() {
-		Assertions.assertEquals(StrUtil.subPre(null, 3), null);
-		Assertions.assertEquals(StrUtil.subPre("ab", 3), "ab");
-		Assertions.assertEquals(StrUtil.subPre("abc", 3), "abc");
-		Assertions.assertEquals(StrUtil.subPre("abcd", 3), "abc");
-		Assertions.assertEquals(StrUtil.subPre("abcd", -3), "a");
-		Assertions.assertEquals(StrUtil.subPre("ab", 3), "ab");
+		Assertions.assertNull(StrUtil.subPre(null, 3));
+		assertEquals("ab", StrUtil.subPre("ab", 3));
+		assertEquals("abc", StrUtil.subPre("abc", 3));
+		assertEquals("abc", StrUtil.subPre("abcd", 3));
+		assertEquals("a", StrUtil.subPre("abcd", -3));
+		assertEquals("ab", StrUtil.subPre("ab", 3));
 	}
 
 	@Test
@@ -265,109 +266,109 @@ public class StrUtilTest {
 
 		// 正确的子字符串
 		final String rightAnswer = StrUtil.subByCodePoint(test, 0, 3);
-		Assertions.assertEquals("\uD83E\uDD14\uD83D\uDC4D\uD83C\uDF53", rightAnswer);
+		assertEquals("\uD83E\uDD14\uD83D\uDC4D\uD83C\uDF53", rightAnswer);
 	}
 
 	@Test
 	public void subBeforeTest() {
 		final String a = "abcderghigh";
 		String pre = StrUtil.subBefore(a, "d", false);
-		Assertions.assertEquals("abc", pre);
+		assertEquals("abc", pre);
 		pre = StrUtil.subBefore(a, 'd', false);
-		Assertions.assertEquals("abc", pre);
+		assertEquals("abc", pre);
 		pre = StrUtil.subBefore(a, 'a', false);
-		Assertions.assertEquals("", pre);
+		assertEquals("", pre);
 
 		//找不到返回原串
 		pre = StrUtil.subBefore(a, 'k', false);
-		Assertions.assertEquals(a, pre);
+		assertEquals(a, pre);
 		pre = StrUtil.subBefore(a, 'k', true);
-		Assertions.assertEquals(a, pre);
+		assertEquals(a, pre);
 	}
 
 	@Test
 	public void subAfterTest() {
 		final String a = "abcderghigh";
 		String pre = StrUtil.subAfter(a, "d", false);
-		Assertions.assertEquals("erghigh", pre);
+		assertEquals("erghigh", pre);
 		pre = StrUtil.subAfter(a, 'd', false);
-		Assertions.assertEquals("erghigh", pre);
+		assertEquals("erghigh", pre);
 		pre = StrUtil.subAfter(a, 'h', true);
-		Assertions.assertEquals("", pre);
+		assertEquals("", pre);
 
 		//找不到字符返回空串
 		pre = StrUtil.subAfter(a, 'k', false);
-		Assertions.assertEquals("", pre);
+		assertEquals("", pre);
 		pre = StrUtil.subAfter(a, 'k', true);
-		Assertions.assertEquals("", pre);
+		assertEquals("", pre);
 	}
 
 	@Test
 	public void subSufByLengthTest() {
-		Assertions.assertEquals("cde", StrUtil.subSufByLength("abcde", 3));
-		Assertions.assertEquals("", StrUtil.subSufByLength("abcde", -1));
-		Assertions.assertEquals("", StrUtil.subSufByLength("abcde", 0));
-		Assertions.assertEquals("abcde", StrUtil.subSufByLength("abcde", 5));
-		Assertions.assertEquals("abcde", StrUtil.subSufByLength("abcde", 10));
+		assertEquals("cde", StrUtil.subSufByLength("abcde", 3));
+		assertEquals("", StrUtil.subSufByLength("abcde", -1));
+		assertEquals("", StrUtil.subSufByLength("abcde", 0));
+		assertEquals("abcde", StrUtil.subSufByLength("abcde", 5));
+		assertEquals("abcde", StrUtil.subSufByLength("abcde", 10));
 	}
 
 	@Test
 	public void repeatAndJoinTest() {
 		String repeatAndJoin = StrUtil.repeatAndJoin("?", 5, ",");
-		Assertions.assertEquals("?,?,?,?,?", repeatAndJoin);
+		assertEquals("?,?,?,?,?", repeatAndJoin);
 
 		repeatAndJoin = StrUtil.repeatAndJoin("?", 0, ",");
-		Assertions.assertEquals("", repeatAndJoin);
+		assertEquals("", repeatAndJoin);
 
 		repeatAndJoin = StrUtil.repeatAndJoin("?", 5, null);
-		Assertions.assertEquals("?????", repeatAndJoin);
+		assertEquals("?????", repeatAndJoin);
 	}
 
 	@Test
 	public void moveTest() {
 		final String str = "aaaaaaa22222bbbbbbb";
 		String result = StrUtil.move(str, 7, 12, -3);
-		Assertions.assertEquals("aaaa22222aaabbbbbbb", result);
+		assertEquals("aaaa22222aaabbbbbbb", result);
 		result = StrUtil.move(str, 7, 12, -4);
-		Assertions.assertEquals("aaa22222aaaabbbbbbb", result);
+		assertEquals("aaa22222aaaabbbbbbb", result);
 		result = StrUtil.move(str, 7, 12, -7);
-		Assertions.assertEquals("22222aaaaaaabbbbbbb", result);
+		assertEquals("22222aaaaaaabbbbbbb", result);
 		result = StrUtil.move(str, 7, 12, -20);
-		Assertions.assertEquals("aaaaaa22222abbbbbbb", result);
+		assertEquals("aaaaaa22222abbbbbbb", result);
 
 		result = StrUtil.move(str, 7, 12, 3);
-		Assertions.assertEquals("aaaaaaabbb22222bbbb", result);
+		assertEquals("aaaaaaabbb22222bbbb", result);
 		result = StrUtil.move(str, 7, 12, 7);
-		Assertions.assertEquals("aaaaaaabbbbbbb22222", result);
+		assertEquals("aaaaaaabbbbbbb22222", result);
 		result = StrUtil.move(str, 7, 12, 20);
-		Assertions.assertEquals("aaaaaaab22222bbbbbb", result);
+		assertEquals("aaaaaaab22222bbbbbb", result);
 
 		result = StrUtil.move(str, 7, 12, 0);
-		Assertions.assertEquals("aaaaaaa22222bbbbbbb", result);
+		assertEquals("aaaaaaa22222bbbbbbb", result);
 	}
 
 	@Test
 	public void removePrefixIgnorecaseTest() {
 		final String a = "aaabbb";
 		String prefix = "aaa";
-		Assertions.assertEquals("bbb", StrUtil.removePrefixIgnoreCase(a, prefix));
+		assertEquals("bbb", StrUtil.removePrefixIgnoreCase(a, prefix));
 
 		prefix = "AAA";
-		Assertions.assertEquals("bbb", StrUtil.removePrefixIgnoreCase(a, prefix));
+		assertEquals("bbb", StrUtil.removePrefixIgnoreCase(a, prefix));
 
 		prefix = "AAABBB";
-		Assertions.assertEquals("", StrUtil.removePrefixIgnoreCase(a, prefix));
+		assertEquals("", StrUtil.removePrefixIgnoreCase(a, prefix));
 	}
 
 	@Test
 	public void limitLengthTest() {
 		final String text = "我是一段正文，很长的正文，需要截取的正文";
 		String str = StrUtil.limitLength(text, 5);
-		Assertions.assertEquals("我是一段正...", str);
+		assertEquals("我是一段正...", str);
 		str = StrUtil.limitLength(text, 21);
-		Assertions.assertEquals(text, str);
+		assertEquals(text, str);
 		str = StrUtil.limitLength(text, 50);
-		Assertions.assertEquals(text, str);
+		assertEquals(text, str);
 	}
 
 	@Test
@@ -396,34 +397,34 @@ public class StrUtilTest {
 	@Test
 	public void centerTest() {
 		Assertions.assertNull(StrUtil.center(null, 10));
-		Assertions.assertEquals("    ", StrUtil.center("", 4));
-		Assertions.assertEquals("ab", StrUtil.center("ab", -1));
-		Assertions.assertEquals(" ab ", StrUtil.center("ab", 4));
-		Assertions.assertEquals("abcd", StrUtil.center("abcd", 2));
-		Assertions.assertEquals(" a  ", StrUtil.center("a", 4));
+		assertEquals("    ", StrUtil.center("", 4));
+		assertEquals("ab", StrUtil.center("ab", -1));
+		assertEquals(" ab ", StrUtil.center("ab", 4));
+		assertEquals("abcd", StrUtil.center("abcd", 2));
+		assertEquals(" a  ", StrUtil.center("a", 4));
 	}
 
 	@Test
 	public void padPreTest() {
 		Assertions.assertNull(StrUtil.padPre(null, 10, ' '));
-		Assertions.assertEquals("001", StrUtil.padPre("1", 3, '0'));
-		Assertions.assertEquals("12", StrUtil.padPre("123", 2, '0'));
+		assertEquals("001", StrUtil.padPre("1", 3, '0'));
+		assertEquals("12", StrUtil.padPre("123", 2, '0'));
 
 		Assertions.assertNull(StrUtil.padPre(null, 10, "AA"));
-		Assertions.assertEquals("AB1", StrUtil.padPre("1", 3, "ABC"));
-		Assertions.assertEquals("12", StrUtil.padPre("123", 2, "ABC"));
+		assertEquals("AB1", StrUtil.padPre("1", 3, "ABC"));
+		assertEquals("12", StrUtil.padPre("123", 2, "ABC"));
 	}
 
 	@Test
 	public void padAfterTest() {
 		Assertions.assertNull(StrUtil.padAfter(null, 10, ' '));
-		Assertions.assertEquals("100", StrUtil.padAfter("1", 3, '0'));
-		Assertions.assertEquals("23", StrUtil.padAfter("123", 2, '0'));
-		Assertions.assertEquals("", StrUtil.padAfter("123", -1, '0'));
+		assertEquals("100", StrUtil.padAfter("1", 3, '0'));
+		assertEquals("23", StrUtil.padAfter("123", 2, '0'));
+		assertEquals("", StrUtil.padAfter("123", -1, '0'));
 
 		Assertions.assertNull(StrUtil.padAfter(null, 10, "ABC"));
-		Assertions.assertEquals("1AB", StrUtil.padAfter("1", 3, "ABC"));
-		Assertions.assertEquals("23", StrUtil.padAfter("123", 2, "ABC"));
+		assertEquals("1AB", StrUtil.padAfter("1", 3, "ABC"));
+		assertEquals("23", StrUtil.padAfter("123", 2, "ABC"));
 	}
 
 	@Test
@@ -444,38 +445,38 @@ public class StrUtilTest {
 		final String src2 = "/ * hutool  */  asdas  / * hutool  */";
 
 		final String[] results1 = StrUtil.subBetweenAll(src1, "/**", "*/");
-		Assertions.assertEquals(0, results1.length);
+		assertEquals(0, results1.length);
 
 		final String[] results2 = StrUtil.subBetweenAll(src2, "/*", "*/");
-		Assertions.assertEquals(0, results2.length);
+		assertEquals(0, results2.length);
 	}
 
 	@Test
 	public void subBetweenAllTest3() {
 		final String src1 = "'abc'and'123'";
 		String[] strings = StrUtil.subBetweenAll(src1, "'", "'");
-		Assertions.assertEquals(2, strings.length);
-		Assertions.assertEquals("abc", strings[0]);
-		Assertions.assertEquals("123", strings[1]);
+		assertEquals(2, strings.length);
+		assertEquals("abc", strings[0]);
+		assertEquals("123", strings[1]);
 
 		final String src2 = "'abc''123'";
 		strings = StrUtil.subBetweenAll(src2, "'", "'");
-		Assertions.assertEquals(2, strings.length);
-		Assertions.assertEquals("abc", strings[0]);
-		Assertions.assertEquals("123", strings[1]);
+		assertEquals(2, strings.length);
+		assertEquals("abc", strings[0]);
+		assertEquals("123", strings[1]);
 
 		final String src3 = "'abc'123'";
 		strings = StrUtil.subBetweenAll(src3, "'", "'");
-		Assertions.assertEquals(1, strings.length);
-		Assertions.assertEquals("abc", strings[0]);
+		assertEquals(1, strings.length);
+		assertEquals("abc", strings[0]);
 	}
 
 	@Test
 	public void subBetweenAllTest4() {
 		final String str = "你好:1388681xxxx用户已开通,1877275xxxx用户已开通,无法发送业务开通短信";
 		final String[] strings = StrUtil.subBetweenAll(str, "1877275xxxx", ",");
-		Assertions.assertEquals(1, strings.length);
-		Assertions.assertEquals("用户已开通", strings[0]);
+		assertEquals(1, strings.length);
+		assertEquals("用户已开通", strings[0]);
 	}
 
 	@Test
@@ -484,14 +485,14 @@ public class StrUtilTest {
 		final String str = RandomUtil.randomStringLower(RandomUtil.randomInt(1, 100));
 		for (int maxLength = 1; maxLength < str.length(); maxLength++) {
 			final String brief = StrUtil.brief(str, maxLength);
-			Assertions.assertEquals(brief.length(), maxLength);
+			assertEquals(brief.length(), maxLength);
 		}
 
 		// case: 不会格式化的值
-		Assertions.assertEquals(str, StrUtil.brief(str, 0));
-		Assertions.assertEquals(str, StrUtil.brief(str, -1));
-		Assertions.assertEquals(str, StrUtil.brief(str, str.length()));
-		Assertions.assertEquals(str, StrUtil.brief(str, str.length() + 1));
+		assertEquals(str, StrUtil.brief(str, 0));
+		assertEquals(str, StrUtil.brief(str, -1));
+		assertEquals(str, StrUtil.brief(str, str.length()));
+		assertEquals(str, StrUtil.brief(str, str.length() + 1));
 	}
 
 	@Test
@@ -499,15 +500,15 @@ public class StrUtilTest {
 		final String str = "123";
 		int maxLength = 3;
 		String brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals("123", brief);
+		assertEquals("123", brief);
 
 		maxLength = 2;
 		brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals("1.", brief);
+		assertEquals("1.", brief);
 
 		maxLength = 1;
 		brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals("1", brief);
+		assertEquals("1", brief);
 	}
 
 	@Test
@@ -516,44 +517,44 @@ public class StrUtilTest {
 
 		int maxLength = 6;
 		String brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals(str, brief);
+		assertEquals(str, brief);
 
 		maxLength = 5;
 		brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals("1...c", brief);
+		assertEquals("1...c", brief);
 
 		maxLength = 4;
 		brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals("1..c", brief);
+		assertEquals("1..c", brief);
 
 		maxLength = 3;
 		brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals("1.c", brief);
+		assertEquals("1.c", brief);
 
 		maxLength = 2;
 		brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals("1.", brief);
+		assertEquals("1.", brief);
 
 		maxLength = 1;
 		brief = StrUtil.brief(str, maxLength);
-		Assertions.assertEquals("1", brief);
+		assertEquals("1", brief);
 	}
 
 	@Test
 	public void filterTest() {
 		final String filterNumber = StrUtil.filter("hutool678", CharUtil::isNumber);
-		Assertions.assertEquals("678", filterNumber);
+		assertEquals("678", filterNumber);
 		final String cleanBlank = StrUtil.filter("	 你 好　", c -> !CharUtil.isBlankChar(c));
-		Assertions.assertEquals("你好", cleanBlank);
+		assertEquals("你好", cleanBlank);
 	}
 
 	@Test
 	public void wrapAllTest() {
 		String[] strings = StrUtil.wrapAll("`", "`", SplitUtil.splitToArray("1,2,3,4", ","));
-		Assertions.assertEquals("[`1`, `2`, `3`, `4`]", StrUtil.utf8Str(strings));
+		assertEquals("[`1`, `2`, `3`, `4`]", StrUtil.utf8Str(strings));
 
 		strings = StrUtil.wrapAllWithPair("`", SplitUtil.splitToArray("1,2,3,4", ","));
-		Assertions.assertEquals("[`1`, `2`, `3`, `4`]", StrUtil.utf8Str(strings));
+		assertEquals("[`1`, `2`, `3`, `4`]", StrUtil.utf8Str(strings));
 	}
 
 	@Test
@@ -568,18 +569,18 @@ public class StrUtilTest {
 	@Test
 	public void indexedFormatTest() {
 		final String ret = StrUtil.indexedFormat("this is {0} for {1}", "a", 1000);
-		Assertions.assertEquals("this is a for 1,000", ret);
+		assertEquals("this is a for 1,000", ret);
 	}
 
 	@Test
 	public void hideTest() {
 		Assertions.assertNull(StrUtil.hide(null, 1, 1));
-		Assertions.assertEquals("", StrUtil.hide("", 1, 1));
-		Assertions.assertEquals("****duan@163.com", StrUtil.hide("jackduan@163.com", -1, 4));
-		Assertions.assertEquals("ja*kduan@163.com", StrUtil.hide("jackduan@163.com", 2, 3));
-		Assertions.assertEquals("jackduan@163.com", StrUtil.hide("jackduan@163.com", 3, 2));
-		Assertions.assertEquals("jackduan@163.com", StrUtil.hide("jackduan@163.com", 16, 16));
-		Assertions.assertEquals("jackduan@163.com", StrUtil.hide("jackduan@163.com", 16, 17));
+		assertEquals("", StrUtil.hide("", 1, 1));
+		assertEquals("****duan@163.com", StrUtil.hide("jackduan@163.com", -1, 4));
+		assertEquals("ja*kduan@163.com", StrUtil.hide("jackduan@163.com", 2, 3));
+		assertEquals("jackduan@163.com", StrUtil.hide("jackduan@163.com", 3, 2));
+		assertEquals("jackduan@163.com", StrUtil.hide("jackduan@163.com", 16, 16));
+		assertEquals("jackduan@163.com", StrUtil.hide("jackduan@163.com", 16, 17));
 	}
 
 
@@ -600,45 +601,57 @@ public class StrUtilTest {
 		// https://gitee.com/dromara/hutool/issues/I4M16G
 		final String replace = "#{A}";
 		final String result = StrUtil.replace(replace, "#{AAAAAAA}", "1");
-		Assertions.assertEquals(replace, result);
+		assertEquals(replace, result);
 	}
 
 	@Test
 	public void testReplaceByStr() {
 		final String replace = "SSM15930297701BeryAllen";
 		final String result = StrUtil.replaceByCodePoint(replace, 5, 12, "***");
-		Assertions.assertEquals("SSM15***01BeryAllen", result);
+		assertEquals("SSM15***01BeryAllen", result);
 
 		final String emoji = StrUtil.replaceByCodePoint("\uD83D\uDE00aabb\uD83D\uDE00ccdd", 2, 6, "***");
-		Assertions.assertEquals("\uD83D\uDE00a***ccdd", emoji);
+		assertEquals("\uD83D\uDE00a***ccdd", emoji);
 	}
 
 	@Test
 	public void testAddPrefixIfNot() {
 		final String str = "hutool";
 		String result = StrUtil.addPrefixIfNot(str, "hu");
-		Assertions.assertEquals(str, result);
+		assertEquals(str, result);
 
 		result = StrUtil.addPrefixIfNot(str, "Good");
-		Assertions.assertEquals("Good" + str, result);
+		assertEquals("Good" + str, result);
 	}
 
 	@Test
 	public void testAddSuffixIfNot() {
 		final String str = "hutool";
 		String result = StrUtil.addSuffixIfNot(str, "tool");
-		Assertions.assertEquals(str, result);
+		assertEquals(str, result);
 
 		result = StrUtil.addSuffixIfNot(str, " is Good");
-		Assertions.assertEquals(str + " is Good", result);
+		assertEquals(str + " is Good", result);
 
 		result = StrUtil.addSuffixIfNot("", "/");
-		Assertions.assertEquals("/", result);
+		assertEquals("/", result);
 	}
 
 	@Test
 	public void issue2628Test(){
 		final String s = StrUtil.indexedFormat("a{0,number,#}", 1234567);
-		Assertions.assertEquals("a1234567", s);
+		assertEquals("a1234567", s);
+	}
+
+	@Test
+	void pr1308Test(){
+		final String concat = StrUtil.concat(true,
+			"start",
+			StrUtil.subPre("123", 2),
+			"middle",
+			StrUtil.subSuf("123", 2),
+			"end");
+
+		assertEquals("start12middle3end", concat);
 	}
 }