refactor: FloydTriangle (#5367)

Author: alxkm

src/main/java/com/thealgorithms/others/FloydTriangle.java

@@ -1,22 +1,30 @@
 package com.thealgorithms.others;
 
-import java.util.Scanner;
+import java.util.ArrayList;
+import java.util.List;
 
 final class FloydTriangle {
     private FloydTriangle() {
     }
 
-    public static void main(String[] args) {
-        Scanner sc = new Scanner(System.in);
-        System.out.println("Enter the number of rows which you want in your Floyd Triangle: ");
-        int r = sc.nextInt();
-        int n = 0;
-        sc.close();
-        for (int i = 0; i < r; i++) {
+    /**
+     * Generates a Floyd Triangle with the specified number of rows.
+     *
+     * @param rows The number of rows in the triangle.
+     * @return A List representing the Floyd Triangle.
+     */
+    public static List<List<Integer>> generateFloydTriangle(int rows) {
+        List<List<Integer>> triangle = new ArrayList<>();
+        int number = 1;
+
+        for (int i = 0; i < rows; i++) {
+            List<Integer> row = new ArrayList<>();
             for (int j = 0; j <= i; j++) {
-                System.out.print(++n + " ");
+                row.add(number++);
             }
-            System.out.println();
+            triangle.add(row);
         }
+
+        return triangle;
     }
 }

src/test/java/com/thealgorithms/others/FloydTriangleTest.java

@@ -0,0 +1,46 @@
+package com.thealgorithms.others;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Arrays;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+
+public class FloydTriangleTest {
+
+    @Test
+    public void testGenerateFloydTriangleWithValidInput() {
+        List<List<Integer>> expectedOutput = Arrays.asList(Arrays.asList(1), Arrays.asList(2, 3), Arrays.asList(4, 5, 6));
+        assertEquals(expectedOutput, FloydTriangle.generateFloydTriangle(3));
+    }
+
+    @Test
+    public void testGenerateFloydTriangleWithOneRow() {
+        List<List<Integer>> expectedOutput = Arrays.asList(Arrays.asList(1));
+        assertEquals(expectedOutput, FloydTriangle.generateFloydTriangle(1));
+    }
+
+    @Test
+    public void testGenerateFloydTriangleWithZeroRows() {
+        List<List<Integer>> expectedOutput = Arrays.asList();
+        assertEquals(expectedOutput, FloydTriangle.generateFloydTriangle(0));
+    }
+
+    @Test
+    public void testGenerateFloydTriangleWithNegativeRows() {
+        List<List<Integer>> expectedOutput = Arrays.asList();
+        assertEquals(expectedOutput, FloydTriangle.generateFloydTriangle(-3));
+    }
+
+    @Test
+    public void testGenerateFloydTriangleWithMultipleRows() {
+        List<List<Integer>> expectedOutput = Arrays.asList(Arrays.asList(1), Arrays.asList(2, 3), Arrays.asList(4, 5, 6), Arrays.asList(7, 8, 9, 10), Arrays.asList(11, 12, 13, 14, 15));
+        assertEquals(expectedOutput, FloydTriangle.generateFloydTriangle(5));
+    }
+
+    @Test
+    public void testGenerateFloydTriangleWithMoreMultipleRows() {
+        List<List<Integer>> expectedOutput = Arrays.asList(Arrays.asList(1), Arrays.asList(2, 3), Arrays.asList(4, 5, 6), Arrays.asList(7, 8, 9, 10), Arrays.asList(11, 12, 13, 14, 15), Arrays.asList(16, 17, 18, 19, 20, 21), Arrays.asList(22, 23, 24, 25, 26, 27, 28));
+        assertEquals(expectedOutput, FloydTriangle.generateFloydTriangle(7));
+    }
+}