Feat/tdd ex

package.json

@@ -53,10 +53,10 @@
     ],
     "coverageThreshold": {
       "global": {
-        "lines": 80,
-        "branches": 80,
-        "functions": 80,
-        "statements": 80
+        "lines": 90,
+        "branches": 90,
+        "functions": 90,
+        "statements": 90
       }
     }
   }

src/__tests__/app.test.js

@@ -1,9 +1,7 @@
 const { getCurrentMonth } = require("../app");
 const { isAdmin } = require("../app");
 
-jest
-  .useFakeTimers()
-  .setSystemTime(new Date('2020-01-01'));
+jest.useFakeTimers().setSystemTime(new Date("2020-01-01"));
 
 describe("app tests suites - getCurrentMonth", () => {
     test("should return the current month", () => {

src/services/__tests__/excludeNamesWithX.test.js

@@ -0,0 +1,23 @@
+const excludeNamesWithX = require("../excludeNamesWithX");
+
+describe("excludeNamesWithX tests suites", () => {
+    it("should return array", () => {
+        const result = excludeNamesWithX([]);
+        expect(result).toEqual([]);
+    });
+
+    it('should return an array with all names as no names have an "x" letter', () => {
+        const result = excludeNamesWithX(["Momo", "Hadji", "Leo"]);
+        expect(result).toEqual(["Momo", "Hadji", "Leo"]);
+    });
+
+    it('should return an array with JeanKevin only as it is the only name without the letter "x" ', () => {
+        const result = excludeNamesWithX(["DMX", "Xzibit", "JeanKevin"]);
+        expect(result).toEqual(["JeanKevin"]);
+    });
+
+    it('should return an array with JC and Leo only as only xena contains the letter "x" ', () => {
+        const result = excludeNamesWithX(["JC", "Leo", "xena"]);
+        expect(result).toEqual(["JC", "Leo"]);
+    });
+});

src/services/excludeNamesWithX.js

@@ -0,0 +1,2 @@
+module.exports = (names) =>
+    names.filter((name) => name.toLowerCase().indexOf("x") === -1);