Java/src/test/java/com/thealgorithms/dynamicprogramming/LongestCommonSubsequenceTest.java at master · TheAlgorithms/Java · GitHub

Name: Java/src/test/java/com/thealgorithms/dynamicprogramming/LongestCommonSubsequenceTest.java at master · TheAlgorithms/Java · GitHub
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packagecom.thealgorithms.dynamicprogramming;

importstaticorg.junit.jupiter.api.Assertions.assertEquals;

importorg.junit.jupiter.api.Test;

publicclassLongestCommonSubsequenceTest {

@Test
publicvoidtestLCSBasic() {
Stringstr1 = "ABCBDAB";
Stringstr2 = "BDCAB";
Stringexpected = "BDAB"; // The longest common subsequence
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }

@Test
publicvoidtestLCSIdenticalStrings() {
Stringstr1 = "AGGTAB";
Stringstr2 = "AGGTAB";
Stringexpected = "AGGTAB"; // LCS is the same as the strings
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }

@Test
publicvoidtestLCSNoCommonCharacters() {
Stringstr1 = "ABC";
Stringstr2 = "XYZ";
Stringexpected = ""; // No common subsequence
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }

@Test
publicvoidtestLCSWithEmptyString() {
Stringstr1 = "";
Stringstr2 = "XYZ";
Stringexpected = ""; // LCS with an empty string should be empty
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }

@Test
publicvoidtestLCSWithBothEmptyStrings() {
Stringstr1 = "";
Stringstr2 = "";
Stringexpected = ""; // LCS with both strings empty should be empty
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }

@Test
publicvoidtestLCSWithNullFirstString() {
Stringstr1 = null;
Stringstr2 = "XYZ";
Stringexpected = null; // Should return null if first string is null
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }

@Test
publicvoidtestLCSWithNullSecondString() {
Stringstr1 = "ABC";
Stringstr2 = null;
Stringexpected = null; // Should return null if second string is null
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }

@Test
publicvoidtestLCSWithNullBothStrings() {
Stringstr1 = null;
Stringstr2 = null;
Stringexpected = null; // Should return null if both strings are null
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }

@Test
publicvoidtestLCSWithLongerStringContainingCommonSubsequence() {
Stringstr1 = "ABCDEF";
Stringstr2 = "AEBDF";
Stringexpected = "ABDF"; // Common subsequence is "ABDF"
Stringresult = LongestCommonSubsequence.getLCS(str1, str2);
assertEquals(expected, result);
 }
}