diff --git a/tests/chai.js b/tests/chai.js
index 77f0679..d1af198 100644
--- a/tests/chai.js
+++ b/tests/chai.js
@@ -2,6 +2,8 @@ var assert = require('assert');
 var expect = require('chai').expect;
 var should = require('chai').should();
 
+syntax error
+
 it('should return true if valid user id', function(){
     expect(true).to.be.true;
 });
diff --git a/tests/tape.js b/tests/tape.js
index 7ca741b..c88cccd 100644
--- a/tests/tape.js
+++ b/tests/tape.js
@@ -7,7 +7,7 @@ test('timing test', function (t) {
 
     t.equal(1, 1);
     t.equal(2, 2);
-    t.end();
+    t.2end();
 
 });
 
diff --git a/tests/unit-js.js b/tests/unit-js.js
index 27751d8..1319455 100644
--- a/tests/unit-js.js
+++ b/tests/unit-js.js
@@ -1,5 +1,7 @@
 var test = require('unit.js');
 
+syntax error
+
 describe('Learning by the example', function(){
     it('example variable', function(){
         // just for example of tested value