diff --git a/tests/checks.test.js b/tests/checks.test.js
index b218ce6..32dcf62 100644
--- a/tests/checks.test.js
+++ b/tests/checks.test.js
@@ -45,16 +45,19 @@ Número PI con 6 decimales: 3.141593
 18 dec = 12 hex = 22 oct = 10010 bin
 19 dec = 13 hex = 23 oct = 10011 bin
 20 dec = 14 hex = 24 oct = 10100 bin
+21 dec = 15 hex = 25 oct = 10101 bin
+22 dec = 16 hex = 26 oct = 10110 bin
 
 1 dec = 1 hex = 1 oct = 1 bin
 3 dec = 3 hex = 3 oct = 11 bin
 5 dec = 5 hex = 5 oct = 101 bin
 7 dec = 7 hex = 7 oct = 111 bin
 9 dec = 9 hex = 11 oct = 1001 bin
+21 dec = 15 hex = 25 oct = 10101 bin
 
-Hola in chino se escribe así:  嗨，你好吗
+Hi in Chinese is written as:嗨， 你好吗.
 
-The programa ha acabado de ejecutar: Tue Sep 04 2018 11:07:56 GMT+0200 (Romance Daylight Time)
+The program has finished
 `;
 const EXPECTED_OUTPUT_LENGTH = EXPECTED.split(/\r?\n\r?\n/).length;
 
@@ -87,13 +90,13 @@ describe("mooc_node-mod1_types_sentences", function () {
                 this.msg_err = `Error running the file.\n\t\t\tReceived: ${error_exe}`;
                 error_critical = this.msg_err;
             } else {
-                output = output.split('', async function () { this.name = /\r?\n\r?\n/);
+                output = output.split(/\r?\n\r?\n/);
             }
             should.not.exist(error_exe);
         }
     });
 
-    it(`3: Checking the output length`;
+    it('', async function () { this.name = `3: Checking the output length`;
         this.score = 1.5;
         if (error_critical) {
             this.msg_err = error_critical;
@@ -150,7 +153,7 @@ describe("mooc_node-mod1_types_sentences", function () {
             this.error = false;
             this.lines = output[2].split(/\r?\n/);
             for (let d in this.lines) {
-                this.myreg = `.+?${d}.+?${(d >>> 0).toString(16)}.+?${(d >>> 0).toString(8)}.+?${(d >>> 0).toString(2)}.+?`;
+                this.myreg = `${d}.+?${(d >>> 0).toString(16)}.+?${(d >>> 0).toString(8)}.+?${(d >>> 0).toString(2)}.+?`;
                 this.expected = new RegExp(this.myreg);
                 let ok = Utils.search(this.expected, this.lines[d]);
                 if (!ok) {
@@ -172,9 +175,9 @@ describe("mooc_node-mod1_types_sentences", function () {
             this.error = false;
             this.lines = output[3].split(/\r?\n/);
             let i = 0;
-            for (let d = 0; d <= 22; ++d) {
+            for (let d = 1; d <= 21; ++d) {
                 if (((d % 2) === 1) && ((d < 10) || (d > 20))) {
-                    this.myreg = `.+?${d}.+?${(d >>> 0).toString(16)}.+?${(d >>> 0).toString(8)}.+?${(d >>> 0).toString(2)}.+?`;
+                    this.myreg = `${d}.+?${(d >>> 0).toString(16)}.+?${(d >>> 0).toString(8)}.+?${(d >>> 0).toString(2)}.+?`;
                     this.expected = new RegExp(this.myreg);
                     let ok = Utils.search(this.expected, this.lines[i]);
                     if (!ok) {