Add app.js and test.js

app.js

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+// We declare the function with the exact name "fromEuroToDollar"
+const fromEuroToDollar = function(valueInEuro) {
+    // Convert the given valueInEuro to dollars
+    let valueInDollar = valueInEuro * 1.07;
+    // return the dollar value
+    return valueInDollar;
+}
+
+// One euro is:
+let oneEuroIs = {
+    "JPY": 156.5, // japan yen
+    "USD": 1.07, // us dollar
+    "GBP": 0.87, // british pound
+}
+
+const fromDollarToYen = function(valueInDollar){
+    let valueInYen = (valueInDollar / oneEuroIs.USD) * oneEuroIs.JPY;
+    return valueInYen;
+}
+
+const fromYentoPound = function(valueInYen){
+    let valueInEuro = valueInYen / oneEuroIs.JPY;
+    let valueInPound = valueInEuro * oneEuroIs.GBP;
+    return valueInPound;
+}
+
+// We include fromEuroToDollar here as well because it needs to be exported
+module.exports = { fromEuroToDollar, fromDollarToYen, fromYentoPound }

test.js

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+test("One euro should be 1.07 dollars", function() {
+    // Import the function from app.js
+    const { fromEuroToDollar } = require('./app.js');
+
+    // Use the function like its supposed to be used
+    const dollars = fromEuroToDollar(3.5);
+
+    // If 1 euro is 1.07 dollars, then 3.5 euros should be (3.5 * 1.07)
+    const expected = 3.5 * 1.07; 
+
+    // This is the comparison for the unit test
+     expect(fromEuroToDollar(3.5)).toBe(3.745); // 1 euro is 1.07 dollars, then 3.5 euros should be = (3.5 * 1.07)
+})
+
+test("Yen to pound", function() {
+    // Import the function from app.js
+    const { fromYentoPound } = require('./app.js');
+
+    // Use the function like its supposed to be used
+    const dollars = fromYentoPound(3.5);
+
+    // If 156.5 Yen is 1 Euro, then 3.5 euros should be (3.5 / 156.5) * 0.87
+    const expected = (3.5 / 156.5) * 0.87; 
+
+    // This is the comparison for the unit test
+    expect(dollars).toBe(expected); 
+})
+
+test("Dollar to Yen", function() {
+    // Import the function from app.js
+    const { fromDollarToYen } = require('./app.js');
+
+    // Use the function like its supposed to be used
+    const dollars = fromDollarToYen(3.5);
+
+    // If 1 euro is 156.5 Yen, then 3.5 euros should be (3.5 / 1.07) * 156.5
+    const expected = (3.5 / 1.07) * 156.5; 
+
+    // This is the comparison for the unit test
+     expect(dollars).toBe(expected); 
+})