diff --git a/index.js b/index.js
index 67e57b3..e69de29 100644
--- a/index.js
+++ b/index.js
@@ -1,41 +0,0 @@
-var factories = require('./factories');
-
-var UserService = require('./services/user-service');
-var AuthorizationService = require('./services/authorization-service');
-var CommentService = require('./services/comment-service');
-
-var user_service = new UserService(factories.user_factory, factories.account_factory);
-var authorization_service = new AuthorizationService(factories.account_factory, factories.token_factory);
-var comment_service = new CommentService(factories.comment_factory);
-
-/*
-authorization_service.get_token('artem', '112233').then(token => {
-    console.log(token)
-}).catch(err => {
-    console.log(err)
-});
-*/
-
-/*
-authorization_service.get_user('TzEk8VIipWzpfvoxNGBZq1EZZsYmzzTc').then((user) => {
-    comment_service.create_comment(user, 'First Nice Comment').then(() => {
-        comment_service.get_comments().then(console.log).catch(console.log);
-    }).catch(console.log);
-}).catch(console.log);
-*/
-
-//user_service.get_users().then((user) => console.log(user[0].comments)).catch(console.log);
-authorization_service.get_token('artem', '112233').then(token => {
-    authorization_service.get_user(token).then((user) => {
-        comment_service.create_comment(user, 'Six Nice Comment', '5734ea8f33aed5a357dfdd65').then(console.log).catch(console.error);
-    }).catch(console.error);
-});
-
-
-comment_service.get_comments().then(console.log);
-
-/*
-comment_service.get_level('5734d79fa589d0685f5268c2', function (level) {
-    console.log(level);
-});
-*/
diff --git a/test/comment-service.js b/test/comment-service.js
new file mode 100644
index 0000000..29306e6
--- /dev/null
+++ b/test/comment-service.js
@@ -0,0 +1,91 @@
+"use strict";
+
+var assert = require('assert');
+
+var CommentService = require('../services/comment-service'),
+    comment_factory = require('./mocks/comment-factory');
+
+var comment_service = undefined,
+    maximum_nesting_lvl = 5;
+
+describe('CommentService', function () {
+    describe('#constructor', function () {
+        it('Should create CommentService instance', function () {
+            comment_service = new CommentService(maximum_nesting_lvl, comment_factory);
+            
+            assert.ok(comment_service instanceof CommentService);
+            assert.ok(comment_service.model);
+        });
+    });
+    
+    describe('#get_comments', function () {
+        it('Should get all comments', function (done) {
+            comment_service.get_comments().then(comments => {
+                assert.ok(comments instanceof Array);
+                assert.ok(comments.length === 2);
+                
+                assert.equal(comments[0].message, "test_message");
+                assert.equal(comments[1].message, "test_message");
+                
+                done();
+            });
+        });
+    });
+    
+    describe('#create_comment', function () {
+        var user = {
+            comments: [],
+            save: function () {
+                return Promise.resolve();
+            }
+        };
+
+        it('Should create new user comment', function (done) {
+            comment_service.nesting_level = maximum_nesting_lvl;
+            
+            comment_service.create_comment(user, "some message", 1)
+                .then(done).catch(done);
+        });
+        
+        it('Should throw error of nesting level', function (done) {
+            comment_service.nesting_level = 1;
+            
+            comment_service.create_comment(user, "some message", 1)
+                .then(() => done(new Error('Should trow error')))
+                .catch(error => {
+                    assert.equal(error.message, "Maximum level of nesting");
+                    
+                    done();
+                });
+        });
+    });
+    
+    describe('#nesting_level', function () {
+        
+        var default_nesting_lvl = 4;
+        
+        it('Should set nesting level', function () {
+            comment_service.nesting_level = 3;
+            
+            assert.equal(comment_service._maximum_nesting_lvl, 3);
+        });
+        
+        it('Should set default nesting level because new more than 10', function () {
+            comment_service.nesting_level = 11;
+            
+            assert.equal(comment_service._maximum_nesting_lvl, default_nesting_lvl);
+        });
+        
+        it('Should set default nesting level because new less than 1', function () {
+            comment_service.nesting_level = 0;
+            
+            assert.equal(comment_service._maximum_nesting_lvl, default_nesting_lvl);
+        });
+        
+        it('Should return current level of nesting', function () {
+            comment_service._maximum_nesting_lvl = default_nesting_lvl;
+            
+            assert.equal(comment_service.nesting_level, default_nesting_lvl);
+        });
+    });
+});
\ No newline at end of file
diff --git a/test/mocks/comment-factory.js b/test/mocks/comment-factory.js
new file mode 100644
index 0000000..24ea54e
--- /dev/null
+++ b/test/mocks/comment-factory.js
@@ -0,0 +1,9 @@
+"use strict";
+
+var comment_model_mock = require('./models/comment');
+
+module.exports = {
+    get_model () {
+        return comment_model_mock;
+    }
+};
\ No newline at end of file
diff --git a/test/mocks/models/comment.js b/test/mocks/models/comment.js
new file mode 100644
index 0000000..4f6e991
--- /dev/null
+++ b/test/mocks/models/comment.js
@@ -0,0 +1,34 @@
+"use strict";
+
+var assert = require('assert');
+
+function Comment(schema) {
+    assert.ok(schema.message);
+    assert.ok(schema.parent);
+    
+    this.save = function () {
+        return Promise.resolve(Object.assign({_id: 1}, schema));
+    }
+}
+
+Comment.get_parent = function (id) {
+    return Promise.resolve((id < 5) ? ++id : undefined);
+};
+
+Comment.get_by_id = function (id) {
+    return Promise.resolve({_id: id, message: "test_message", parent: ++id});
+};
+
+Comment.get_all = function () {
+    return Promise.resolve([{
+        _id: 1,
+        message: "test_message",
+        parent: undefined
+    }, {
+        _id: 2,
+        message: "test_message",
+        parent: undefined
+    }]);
+};
+
+module.exports = Comment;
\ No newline at end of file