BAEL-3191 - review changes

core-groovy-2/src/main/groovy/com/baeldung/category/BaeldungCategory.groovy

@@ -10,8 +10,8 @@ class BaeldungCategory {
         return capitalizedStr
     }
     
-    public static Number square(Number self) {
-        return self*self;
+    public static double toThePower(Number self, Number exponent) {
+        return Math.pow(self, exponent);
     }
 
 }

core-groovy-2/src/main/groovy/com/baeldung/category/NumberCategory.groovy

@@ -4,13 +4,14 @@ import groovy.lang.Category
 
 @Category(Number)
 class NumberCategory {
-    
+
     public Number cube() {
         return this*this*this
     }
-    
-    public Number toThePower(Number exponent) {
-        return Math.pow(this, exponent)
+
+    public int divideWithRoundUp(BigDecimal divisor, boolean isRoundUp) {
+        def mathRound = isRoundUp ? BigDecimal.ROUND_UP : BigDecimal.ROUND_DOWN
+        return (int)new BigDecimal(this).divide(divisor, 0, mathRound)
     }
 
 }

core-groovy-2/src/test/groovy/com/baeldung/category/CategoryUnitTest.groovy

@@ -82,17 +82,19 @@ class CategoryUnitTest extends GroovyTestCase {
         } 
     }
     
-    void test_whenUsingBaeldungCategory_thenSquareNumber() {
+    void test_whenUsingBaeldungCategory_thenOperationsOnNumber() {
         use (BaeldungCategory) {
-            assert 50.square() == 2500
-            assert 20.01.square() == 400.4001
+            assert 50.toThePower(2) == 2500
+            assert 2.4.toThePower(4) == 33.1776
         }
     }
     
-    void test_whenUsingNumberUtils_thenCubeNumber() {
+    void test_whenUsingNumberCategory_thenOperationsOnNumber() {
         use (NumberCategory) {
             assert 3.cube() == 27
-            assert 2.4.toThePower(4) == 33.1776
+            assert 25.divideWithRoundUp(6, true) == 5
+            assert 120.23.divideWithRoundUp(6.1, true) == 20
+            assert 150.9.divideWithRoundUp(12.1, false) == 12
         }
     }