Add test for calculateMedian and calculateMean using salaries array

Author: HoussamLh

prep/median.js

@@ -0,0 +1,9 @@
+// prep/median.js
+function calculateMedian(list) {
+  const middleIndex = Math.floor(list.length / 2);
+  const median = list.splice(middleIndex, 1)[0];
+
+  return median;
+}
+module.exports = calculateMedian;
+

prep/median.test.js

@@ -0,0 +1,21 @@
+const calculateMedian = require("./median");
+const calculateMean = require("./mean");
+
+test("calculates the median of a list of odd length", () => {
+  const list = [10, 20, 30, 50, 60];
+  const currentOutput = calculateMedian(list);
+  const targetOutput = 30;
+
+  expect(currentOutput).toEqual(targetOutput);
+})
+
+// Both functions access the same array 
+// because JavaScript passes objects and 
+// arrays by reference — they all point to the same memory location.
+
+const salaries = [10, 20, 30, 40, 60, 80, 80];
+const median = calculateMedian(salaries);
+const mean = calculateMean(salaries);
+console.log(salaries, "<--- salaries input before we call calculateMean");
+console.log(`The median salary is ${median}`);
+console.log(`The mean salary is ${mean}`);

prep/package.json

@@ -1,6 +1,11 @@
 {
   "name": "mean.test.js",
   "version": "1.0.0",
+  "scripts": {
+    "test": "jest"
+  }, 
+   "name": "median.test.js",
+  "version": "1.0.0",
   "scripts": {
     "test": "jest"
   },