diff --git a/composer.json b/composer.json
index 99305b38..3507487c 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,8 @@
         "phpunit/phpunit": "^4.8",
         "squizlabs/php_codesniffer": "*",
         "wp-coding-standards/wpcs": "^0.14",
-        "exussum12/coverage-checker": "^0.8.0"
+        "exussum12/coverage-checker": "^0.8.0",
+        "10up/wp_mock": "0.2.0"
     },
     "scripts": {
         "test": "phpunit",
diff --git a/composer.lock b/composer.lock
index 42a27e42..6647b851 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b30205d17edce06405f21b2931b20083",
+    "content-hash": "24d1264df3d154fd3666ad41b7f5c8b0",
     "packages": [
         {
             "name": "ebanx/benjamin",
@@ -50,6 +50,89 @@
         }
     ],
     "packages-dev": [
+        {
+            "name": "10up/wp_mock",
+            "version": "0.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/10up/wp_mock.git",
+                "reference": "507e59027e9b0d86eba9b74420962a72c4c2ec9e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/10up/wp_mock/zipball/507e59027e9b0d86eba9b74420962a72c4c2ec9e",
+                "reference": "507e59027e9b0d86eba9b74420962a72c4c2ec9e",
+                "shasum": ""
+            },
+            "require": {
+                "antecedent/patchwork": "~2.0.3",
+                "mockery/mockery": "^0.9.5",
+                "php": ">=5.6",
+                "phpunit/phpunit": ">=4.3"
+            },
+            "conflict": {
+                "phpunit/phpunit": ">=6.0"
+            },
+            "require-dev": {
+                "behat/behat": "^3.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "WP_Mock\\": "./php/WP_Mock"
+                },
+                "classmap": [
+                    "php/WP_Mock.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "GPL-2.0+"
+            ],
+            "description": "A mocking library to take the pain out of unit testing for WordPress",
+            "time": "2017-07-19T03:10:11+00:00"
+        },
+        {
+            "name": "antecedent/patchwork",
+            "version": "2.0.9",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/antecedent/patchwork.git",
+                "reference": "cab3be4865e47f1dc447715e76c7b616e48b005d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/antecedent/patchwork/zipball/cab3be4865e47f1dc447715e76c7b616e48b005d",
+                "reference": "cab3be4865e47f1dc447715e76c7b616e48b005d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0"
+            },
+            "type": "library",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ignas Rudaitis",
+                    "email": "ignas.rudaitis@gmail.com"
+                }
+            ],
+            "description": "Method redefinition (monkey-patching) functionality for PHP.",
+            "homepage": "http://patchwork2.org/",
+            "keywords": [
+                "aop",
+                "aspect",
+                "interception",
+                "monkeypatching",
+                "redefinition",
+                "runkit",
+                "testing"
+            ],
+            "time": "2017-08-01T11:52:57+00:00"
+        },
         {
             "name": "dealerdirect/phpcodesniffer-composer-installer",
             "version": "v0.4.4",
@@ -218,6 +301,122 @@
             "description": "Allows checking the code coverage of a single pull request",
             "time": "2017-11-03T09:29:46+00:00"
         },
+        {
+            "name": "hamcrest/hamcrest-php",
+            "version": "1.2.x-dev",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/hamcrest/hamcrest-php.git",
+                "reference": "26968e9810ff0d1aa48f6d67a862559d92a51884"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/hamcrest/hamcrest-php/zipball/26968e9810ff0d1aa48f6d67a862559d92a51884",
+                "reference": "26968e9810ff0d1aa48f6d67a862559d92a51884",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3|^7.0"
+            },
+            "replace": {
+                "cordoval/hamcrest-php": "*",
+                "davedevelopment/hamcrest-php": "*",
+                "kodova/hamcrest-php": "*"
+            },
+            "require-dev": {
+                "phpunit/php-file-iterator": "1.3.3",
+                "phpunit/phpunit": "~4.0",
+                "satooshi/php-coveralls": "^1.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.2-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "hamcrest"
+                ],
+                "files": [
+                    "hamcrest/Hamcrest.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "description": "This is the PHP port of Hamcrest Matchers",
+            "keywords": [
+                "test"
+            ],
+            "time": "2018-02-19T09:04:07+00:00"
+        },
+        {
+            "name": "mockery/mockery",
+            "version": "0.9.x-dev",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/mockery/mockery.git",
+                "reference": "be9bf28d8e57d67883cba9fcadfcff8caab667f8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/mockery/mockery/zipball/be9bf28d8e57d67883cba9fcadfcff8caab667f8",
+                "reference": "be9bf28d8e57d67883cba9fcadfcff8caab667f8",
+                "shasum": ""
+            },
+            "require": {
+                "hamcrest/hamcrest-php": "~1.1",
+                "lib-pcre": ">=7.0",
+                "php": ">=5.3.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "0.9.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Mockery": "library/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Pádraic Brady",
+                    "email": "padraic.brady@gmail.com",
+                    "homepage": "http://blog.astrumfutura.com"
+                },
+                {
+                    "name": "Dave Marshall",
+                    "email": "dave.marshall@atstsolutions.co.uk",
+                    "homepage": "http://davedevelopment.co.uk"
+                }
+            ],
+            "description": "Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL). Designed as a drop in alternative to PHPUnit's phpunit-mock-objects library, Mockery is easy to integrate with PHPUnit and can operate alongside phpunit-mock-objects without the World ending.",
+            "homepage": "http://github.com/padraic/mockery",
+            "keywords": [
+                "BDD",
+                "TDD",
+                "library",
+                "mock",
+                "mock objects",
+                "mockery",
+                "stub",
+                "test",
+                "test double",
+                "testing"
+            ],
+            "time": "2019-02-12T16:07:13+00:00"
+        },
         {
             "name": "phpdocumentor/reflection-common",
             "version": "1.0.1",
@@ -807,6 +1006,7 @@
                 "mock",
                 "xunit"
             ],
+            "abandoned": true,
             "time": "2015-10-02T06:51:40+00:00"
         },
         {
diff --git a/tests/unit/bootstrap.php b/tests/unit/bootstrap.php
index e6ae327d..4bf0273f 100644
--- a/tests/unit/bootstrap.php
+++ b/tests/unit/bootstrap.php
@@ -4,8 +4,10 @@
 define('WC_EBANX_VENDOR_DIR', realpath('.') . '/vendor/');
 define('IS_TEST', true);
 
+
 require __DIR__ . '/includes/wc_class.php';
-require __DIR__ . '/includes/wc_function.php';
+//require __DIR__ . '/includes/wc_function.php';
+require WC_EBANX_VENDOR_DIR . '/autoload.php';
 
 require_once realpath('.') . '/gateways/class-wc-ebanx-global-gateway.php';
 
diff --git a/tests/unit/includes/wc_function.php b/tests/unit/includes/wc_function.php
deleted file mode 100644
index ec74aa75..00000000
--- a/tests/unit/includes/wc_function.php
+++ /dev/null
@@ -1,21 +0,0 @@
-<?php
-
-function __($string, $namespace){
-	return $string;
-}
-
-function get_woocommerce_currency() {
-	return 'BRL';
-}
-
-function apply_filters($string, $array) {
-	return $array;
-}
-
-function add_action($string, $array) {
-	return;
-}
-
-function get_plugins() {
-	return [];
-}
diff --git a/tests/unit/services/EbanxHelperTest.php b/tests/unit/services/EbanxHelperTest.php
index f7bbe9a1..40f408f5 100644
--- a/tests/unit/services/EbanxHelperTest.php
+++ b/tests/unit/services/EbanxHelperTest.php
@@ -3,7 +3,17 @@
 use PHPUnit\Framework\TestCase;
 
 class EbanxHelperTest extends TestCase {
+	public function setUp() {
+		\WP_Mock::setUp();
+	}
 	public function testPluginCheckArray() {
+		\WP_Mock::userFunction( 'get_woocommerce_currency', [
+			'return_in_order' => ['BRL']
+		]);
+		\WP_Mock::userFunction( 'get_plugins', array(
+			'return_in_order' => array([['Version' => '0.0.1', 'Name' => 'Mock']])
+		));
+
 		$config = new WC_EBANX_Global_Gateway();
 		$plugin_check = WC_EBANX_Helper::plugin_check($config);
 		$this->assertPluginCheck($plugin_check);