Added functions in Perimeter.java (#3739)

* Added functions and removed main

* deleted perimeterTest.java

deleted perimeterTest.java to create PerimeterTest.java

* Recreated PerimeterTest.java

Renamed perimeterTest.java to PerimeterTest.java and added test cases

* deleted PerimeterTest.java

* Recreated PerimeterTest.java

Recreated PerimeterTest.java from perimeterTest.java

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

@@ -0,0 +1,51 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class PerimeterTest {
+
+    // Perimeter of Regular polygon
+    @Test
+    void testcase1() {
+        Assertions.assertEquals(20.0, Perimeter.perimeterRegularPolygon(4, 5));
+    }
+
+    @Test
+    void testcase2() {
+        Assertions.assertEquals(30.0, Perimeter.perimeterRegularPolygon(5, 6));
+    }
+
+    // Perimeter of Rectangle
+    @Test
+    void testcase3() {
+        Assertions.assertEquals(18.0, Perimeter.perimeterRectangle(4, 5));
+    }
+
+    @Test
+    void testcase4() {
+        Assertions.assertEquals(14.0, Perimeter.perimeterRectangle(4, 3));
+    }
+
+    // Circumference/Perimeter of a circle
+    @Test
+    void testcase5() {
+        Assertions.assertEquals(31.41592653589793, Perimeter.perimeterCircle(5));
+    }
+
+    @Test
+    void testcase6() {
+        Assertions.assertEquals(43.982297150257104, Perimeter.perimeterCircle(7));
+    }
+  
+    // Perimeter of Irregular polygon
+    @Test
+    void testcase7() {
+        Assertions.assertEquals(12.0, Perimeter.perimeterIrregularPolygon(4, 5, 3));
+    }
+
+    @Test
+    void testcase8() {
+        Assertions.assertEquals(21.0, Perimeter.perimeterIrregularPolygon(3, 4, 5, 3, 6));
+    }
+}

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

@@ -1,40 +0,0 @@
-package com.thealgorithms.maths;
-
-import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.Test;
-
-public class perimeterTest {
-
-    //Perimeter of polygon
-    @Test
-    void testcase1() {
-        Assertions.assertEquals(20.0, Perimeter.perimeter_polygon(4, 5));
-    }
-
-    @Test
-    void testcase2() {
-        Assertions.assertEquals(30.0, Perimeter.perimeter_polygon(5, 6));
-    }
-
-    //Perimeter of Rectangle
-    @Test
-    void testcase3() {
-        Assertions.assertEquals(18.0, Perimeter.perimeter_rectangle(4, 5));
-    }
-
-    @Test
-    void testcase4() {
-        Assertions.assertEquals(14.0, Perimeter.perimeter_rectangle(4, 3));
-    }
-
-    //Circumference of a circle
-    @Test
-    void testcase5() {
-        Assertions.assertEquals(31.41592653589793, Perimeter.circumference(5));
-    }
-
-    @Test
-    void testcase6() {
-        Assertions.assertEquals(43.982297150257104, Perimeter.circumference(7));
-    }
-}