Cleanup PerfectSquare and its tests (TheAlgorithms#4992)

Author: vil02

src/main/java/com/thealgorithms/maths/PerfectSquare.java

@@ -3,14 +3,8 @@
 /**
  * https://en.wikipedia.org/wiki/Perfect_square
  */
-public class PerfectSquare {
-
-    public static void main(String[] args) {
-        assert !isPerfectSquare(-1);
-        assert !isPerfectSquare(3);
-        assert !isPerfectSquare(5);
-        assert isPerfectSquare(9);
-        assert isPerfectSquare(100);
+public final class PerfectSquare {
+    private PerfectSquare() {
     }
 
     /**
@@ -20,8 +14,8 @@ public static void main(String[] args) {
      * @return <tt>true</tt> if {@code number} is perfect square, otherwise
      * <tt>false</tt>
      */
-    public static boolean isPerfectSquare(int number) {
-        int sqrt = (int) Math.sqrt(number);
+    public static boolean isPerfectSquare(final int number) {
+        final int sqrt = (int) Math.sqrt(number);
         return sqrt * sqrt == number;
     }
 }

src/test/java/com/thealgorithms/maths/PerfectSquareTest.java

@@ -1,38 +1,21 @@
 package com.thealgorithms.maths;
 
-import static org.junit.jupiter.api.Assertions.*;
-
+import java.util.stream.Stream;
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 
 public class PerfectSquareTest {
-
-    @Test
-    public void TestPerfectSquareifiscorrect() {
-        // Valid Partition
-        int number = 9;
-
-        boolean result = PerfectSquare.isPerfectSquare(number);
-
-        assertTrue(result);
-    }
-
-    @Test
-    public void TestPerfectSquareifisnotcorrect() {
-        // Invalid Partition 1
-        int number = 3;
-
-        boolean result = PerfectSquare.isPerfectSquare(number);
-
-        assertFalse(result);
+    @ParameterizedTest
+    @ValueSource(ints = {0, 1, 2 * 2, 3 * 3, 4 * 4, 5 * 5, 6 * 6, 7 * 7, 8 * 8, 9 * 9, 10 * 10, 11 * 11, 123 * 123})
+    void positiveTest(final int number) {
+        Assertions.assertTrue(PerfectSquare.isPerfectSquare(number));
     }
 
-    @Test
-    public void TestPerfectSquareifisNegativeNumber() {
-        // Invalid Partition 2
-        int number = -10;
-
-        boolean result = PerfectSquare.isPerfectSquare(number);
-
-        assertFalse(result);
+    @ParameterizedTest
+    @ValueSource(ints = {-1, -2, -3, -4, -5, -100, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 17, 99, 101, 257, 999, 1001})
+    void negativeTest(final int number) {
+        Assertions.assertFalse(PerfectSquare.isPerfectSquare(number));
     }
 }