add slash for path

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

@@ -0,0 +1,27 @@
+package cn.hutool.core.text;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class CharSequenceUtilTest {
+
+	@Test
+	public void addPrefixIfNotTest(){
+		String str = "hutool";
+		String result = CharSequenceUtil.addPrefixIfNot(str, "hu");
+		Assert.assertEquals(str, result);
+
+		result = CharSequenceUtil.addPrefixIfNot(str, "Good");
+		Assert.assertEquals("Good" + str, result);
+	}
+
+	@Test
+	public void addSuffixIfNotTest(){
+		String str = "hutool";
+		String result = CharSequenceUtil.addSuffixIfNot(str, "tool");
+		Assert.assertEquals(str, result);
+
+		result = CharSequenceUtil.addSuffixIfNot(str, " is Good");
+		Assert.assertEquals( str + " is Good", result);
+	}
+}