Merge pull request #366 from andrechristikan/development

Development

Author: andrechristikan

src/common/helper/interfaces/helper.number-service.interface.ts

@@ -6,4 +6,6 @@ export interface IHelperNumberService {
     random(length: number): number;
 
     randomInRange(min: number, max: number): number;
+
+    percent(value: number, total: number): number;
 }

src/common/helper/services/helper.number.service.ts

@@ -22,4 +22,12 @@ export class HelperNumberService implements IHelperNumberService {
     randomInRange(min: number, max: number): number {
         return faker.datatype.number({ min, max });
     }
+
+    percent(value: number, total: number): number {
+        let tValue = value / total;
+        if (Number.isNaN(tValue) || !Number.isFinite(tValue)) {
+            tValue = 0;
+        }
+        return Number.parseFloat((tValue * 100).toFixed(2));
+    }
 }

test/unit/helper/helper.number.service.spec.ts

@@ -83,4 +83,31 @@ describe('HelperNumberService', () => {
             expect(result).toBeTruthy();
         });
     });
+
+    describe('percent', () => {
+        it('should be called', async () => {
+            const test = jest.spyOn(helperNumberService, 'percent');
+
+            helperNumberService.percent(5, 8);
+            expect(test).toHaveBeenCalledWith(5, 8);
+        });
+
+        it('should be success with NaN or Infinite', async () => {
+            const result = helperNumberService.percent(0, 0);
+            jest.spyOn(helperNumberService, 'percent').mockImplementation(
+                () => result
+            );
+
+            expect(helperNumberService.percent(5, 8)).toBe(result);
+        });
+
+        it('should be success', async () => {
+            const result = helperNumberService.percent(5, 8);
+            jest.spyOn(helperNumberService, 'percent').mockImplementation(
+                () => result
+            );
+
+            expect(helperNumberService.percent(5, 8)).toBe(result);
+        });
+    });
 });