Merge pull request 4GeeksAcademy#30 from ElviraQDP/master

fixing ex 10.1

Author: alesanchezr

exercises/10.1-Creating-Your-First-Function/README.es.md

@@ -3,8 +3,7 @@
 
 ## 📝 Instrucciones:
 
-1. La función `add_numbers` debería devolver la suma de 2 números dados. Por favor,
-completa el código necesario dentro de la función para hacer que se comporte como se espera.
+1. La función `add_numbers` debería devolver la suma de 2 números dados. Por favor, completa el código necesario dentro de la función para hacer que se comporte como se espera.
 
 ## Resultado esperado:
 

exercises/10.1-Creating-Your-First-Function/app.js

@@ -0,0 +1,7 @@
+function addNumbers(a,b)
+{
+	// This is the function body. Write your code here.
+}
+
+//Do not change the code below
+console.log(addNumbers(3,4));

exercises/10.1-Creating-Your-First-Function/tests.js

@@ -0,0 +1,33 @@
+const fs = require('fs');
+const path = require('path');
+
+jest.dontMock('fs');
+//here we are going to store and accumulate (concatenate) all the console log's from the exercise
+let _buffer = "";
+let _log = console.log;
+
+// lets override the console.log function to mock it,
+// but we are also going to save what supposed to be the ouput of the console inside _buffer
+global.console.log = console.log = jest.fn((text) => _buffer += text + "\n");
+
+describe('All the javascript should match', function () {
+    beforeEach(() => {
+        //here I import the HTML into the document
+    });
+    afterEach(() => { jest.resetModules(); });
+
+    it('console.log() function should be called with the sum of 3 + 4', function () {
+
+
+        //then I import the index.js (which should have the alert() call inside)
+        const file = require("./app.js");
+
+        //Expect the console log to have been called with the sum of 3 + 4 at least once
+        expect(console.log).toHaveBeenCalledWith(3+4);
+        //and I expect the console.log to be already called just one time.
+        expect(console.log.mock.calls.length).toBe(1);
+
+        //You can also compare the entire console buffer (if there have been several console.log calls on the exercise)
+        //expect(_buffer).toBe("Compare with the entire function buffer out");
+    });
+});