testing functions

Author: alieldeba

dist/functionality.min.js

@@ -5,6 +5,12 @@
  * @returns {number}
  */
 function reverseNum(number) {
+  if (number == 0 || number == -0) {
+    return 0;
+  }
+  if (!number) {
+    return "";
+  }
   // this code is changed from the original one because it didn't work properly when the number is decimal
   if (number < 10 && number > -10) {
     return number;

project/js/functionality/reverseNum.js

@@ -0,0 +1,21 @@
+const reverseNum = require("../project/js/functionality/reverseNum.js");
+
+it("always returns a number", function () {
+  expect(typeof reverseNum(123)).toBe("number");
+});
+
+it("returns the number reversed", function () {
+  expect(reverseNum(123)).toBe(321);
+});
+
+it("returns empty string if there is no parameter", function () {
+  expect(reverseNum()).toBe("");
+});
+
+it("returns the number if it its length equal to 1", function () {
+  expect(reverseNum(0)).toBe(0);
+});
+
+it("does not reverse the negative sign when reversing number", function () {
+  expect(reverseNum(-123)).toBe(-321);
+});

tests/reverseNum.test.js

@@ -1,21 +1,21 @@
-const reversestring = require("../project/js/functionality/reverseString.js");
+const reverseString = require("../project/js/functionality/reverseString.js");
 
 it("always return a string", function () {
-  expect(typeof reversestring("hello")).toBe("string");
+  expect(typeof reverseString("hello")).toBe("string");
 });
 
 it("always reverse the parameter", function () {
-  expect(reversestring("hello")).toBe("olleh");
+  expect(reverseString("hello")).toBe("olleh");
 });
 
 it("returns empty string if no parameter", function () {
-  expect(reversestring()).toBe("");
+  expect(reverseString()).toBe("");
 });
 
 it("returns empty string if the parameter is not a string", function () {
-  expect(reversestring(5)).toBe("");
+  expect(reverseString(5)).toBe("");
 });
 
 it("does not matter about multiple parameters", function () {
-  expect(reversestring("hello", "world")).toBe("olleh");
+  expect(reverseString("hello", "world")).toBe("olleh");
 });