added tests

DynamicProgramming/LongestPalindromicSubsequence.java

@@ -1,10 +1,9 @@
-package DynamicProgramming;
+package test;
 import java.lang.*; 
 import java.io.*; 
 import java.util.*; 
   
 /**
- * @author Matteo Messmer https://github.com/matteomessmer
  * Algorithm explanation https://www.educative.io/edpresso/longest-palindromic-subsequence-algorithm
  */
 public class LongestPalindromicSubsequence {
@@ -19,9 +18,8 @@ public class LongestPalindromicSubsequence {
         System.out.println(b + " => " + bLPS);
     }
 
-    private static String LPS(String original) {
+    public static String LPS(String original) throws IllegalArgumentException {
-        StringBuilder reverse = new StringBuilder(); 
+        StringBuilder reverse = new StringBuilder(original);
-        reverse.append(original); 
         reverse = reverse.reverse();
         return recursiveLPS(original, reverse.toString());
     }

DynamicProgramming/LongestPalindromicSubsequenceTests.java

@@ -0,0 +1,33 @@
+package test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class LongestPalindromicSubsequenceTests {
+
+	@Test
+	void test1() {
+		assertEquals(LongestPalindromicSubsequence.LPS(""), "");
+	}
+	
+	@Test
+	void test2() {
+		assertEquals(LongestPalindromicSubsequence.LPS("A"), "A");
+	}
+	
+	@Test
+	void test3() {
+		assertEquals(LongestPalindromicSubsequence.LPS("BABCBAB"), "BABCBAB");
+	}
+
+	@Test
+	void test4() {
+		assertEquals(LongestPalindromicSubsequence.LPS("BBABCBCAB"), "BABCBAB");
+	}
+	
+	@Test
+	void test5() {
+		assertEquals(LongestPalindromicSubsequence.LPS("AAAAAAAAAAAAAAAAAAAAAAAA"), "AAAAAAAAAAAAAAAAAAAAAAAA");
+	}
+}