feat: add tests for isValidPageSize and isValidPageNumber methods

src/models/ArgumentValidator.ts

@@ -31,7 +31,7 @@ export class ArgumentValidator {
    * @returns {boolean} - True if the value is a valid page size; otherwise, false.
    * @remarks - A valid page size is a number greater than 0 and less than or equal to 1000.
    */
-  public static isValidPageSize(value: number): boolean {
+  public static isValidPageSize(value: number | null | undefined): boolean {
     return value > 0 && value <= 1000;
   }
 
@@ -40,7 +40,7 @@ export class ArgumentValidator {
    * @returns {boolean} - True if the value is a valid page number; otherwise, false.
    * @remarks - A valid page number is a number greater than 0.
    */
-  public static isValidPageNumber(value: number): boolean {
+  public static isValidPageNumber(value: number | null | undefined): boolean {
     return value > 0;
   }
 }

tests/ArgumentValidator.spec.ts

@@ -169,4 +169,68 @@ describe('ArgumentValidator', function () {
       expect(ArgumentValidator.isValidUrl('https://www.google.com')).to.be.true;
     });
   });
+
+  describe('isValidPageSize', function () {
+    it('should be defined', function () {
+      expect(ArgumentValidator.isValidPageSize).to.not.be.undefined;
+    });
+
+    it('should have 1 parameter of type number', function () {
+      expect(ArgumentValidator.isValidPageSize).to.have.lengthOf(1);
+    });
+
+    it('should return false when the value is null', function () {
+      expect(ArgumentValidator.isValidPageSize(null)).to.be.false;
+    });
+
+    it('should return false when the value is undefined', function () {
+      expect(ArgumentValidator.isValidPageSize(undefined)).to.be.false;
+    });
+
+    it('should return false when the value is greater than 1000', function (){
+      expect(ArgumentValidator.isValidPageSize(1001)).to.be.false;
+    });
+
+    it('should return false when the value is less than 1', function (){
+      expect(ArgumentValidator.isValidPageSize(0)).to.be.false;
+    });
+
+    it('should return true when the value is 1', function (){
+      expect(ArgumentValidator.isValidPageSize(1)).to.be.true;
+    });
+
+    it('should return true when the value is 1000', function (){
+      expect(ArgumentValidator.isValidPageSize(1000)).to.be.true;
+    });
+
+    it('should return true when the value is 500', function (){
+      expect(ArgumentValidator.isValidPageSize(500)).to.be.true;
+    });
+  });
+
+  describe('isValidPageNumber', function () {
+    it('should be defined', function () {
+      expect(ArgumentValidator.isValidPageNumber).to.not.be.undefined;
+    });
+
+    it('should have 1 parameter of type number', function () {
+      expect(ArgumentValidator.isValidPageNumber).to.have.lengthOf(1);
+    });
+
+    it('should return false when the value is null', function () {
+      expect(ArgumentValidator.isValidPageNumber(null)).to.be.false;
+    });
+
+    it('should return false when the value is undefined', function () {
+      expect(ArgumentValidator.isValidPageNumber(undefined)).to.be.false;
+    });
+
+    it('should return false when the value is less than 1', function (){
+      expect(ArgumentValidator.isValidPageNumber(0)).to.be.false;
+    });
+
+    it('should return true when the value is 1', function (){
+      expect(ArgumentValidator.isValidPageNumber(1)).to.be.true;
+    });
+  });
 });