diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..52f8fa9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+/vendor
+/composer.lock
+.DS_Store
+.idea
+*.yml
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a8fc851
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2016 
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..49886a2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,72 @@
+slack-codeception-extension
+=============================
+This package provides an extension for Codeception to send test results to Slack channels and/or users.
+
+Pre-requisites
+-------------
+
+- a pre-configured webhook from the Slack integration "Incoming Webhook"
+(see https://api.slack.com/incoming-webhooks for more information)
+
+Installation
+-----------
+
+Add the package `ngraf/slack-codeception-extension` to `composer.json` manually or type this in console:
+
+    composer require ngraf/slack-codeception-extension
+    
+Usage
+-----
+Enable and configure the extension in your `codeception.yaml`
+
+**Basic** usage:
+
+    extensions:
+      enabled:
+        - Codeception\Extension\SlackExtension
+      config:
+        Codeception\Extension\SlackExtension:
+           webhook: https://hooks.slack.com/services/...
+           
+**Advanced** usage:
+
+    extensions:
+      enabled:
+        - Codeception\Extension\SlackExtension
+      config:
+        Codeception\Extension\SlackExtension:
+          webhook:           https://hooks.slack.com/services/...
+           
+          # possible notification strategies: always|successonly|failonly|failandrecover|statuschange
+          strategy:          always
+           
+          # If 'true' details about failed tests will be displayed. Default value: 'false'
+          extended:          true
+           
+          # Limit the size of error messages in extended mode. 0 = unlimited. Default value: 80
+          extendedMaxLength: 80
+           
+          # Limit the amount of reported errors in extended mode. 0 = unlimited. Default value: 0
+          extendedMaxErrors: 10
+           
+          # customize your message with additional prefix and/or suffix
+           
+          messagePrefix:     '*Smoke-Test*'
+          messageSuffix:     <http://my-ci/my-job|Link>
+          messageSuffixOnFail: <!channel>
+           
+          # optional config keys that will overwrite the default configuration of the webhook
+                      
+          channel:           '#any-channel,@any-user'
+          channelOnFail:     '#any-channel,@any-user'
+          username:          CI
+          icon:              :ghost:
+           
+Example
+-----
+
+![slack-example](slack-example.png)
+
+Dependencies
+-----
+This package uses the package [maknz/slack](https://github.com/maknz/slack) to communicate with the Slack API.
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..b74abe8
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,25 @@
+{
+  "name": "ngraf/slack-codeception-extension",
+  "description": "This package provides an extension for Codeception to broadcast test results in Slack messenger ",
+  "keywords": [
+    "codeception",
+    "slack",
+    "extension"
+  ],
+  "authors": [
+    {
+      "name": "Norbert Graf",
+      "email": "derbimmel@gmail.com",
+      "homepage": "https://github.com/ngraf",
+      "role": "Developer"
+    }
+  ],
+  "autoload": {
+    "psr-4": {
+      "Codeception\\": "src"
+    }
+  },
+  "require": {
+    "alek13/slack": "^2.0"
+  }
+}
diff --git a/slack-example.png b/slack-example.png
new file mode 100644
index 0000000..d439113
Binary files /dev/null and b/slack-example.png differ
diff --git a/src/Extension/SlackExtension.php b/src/Extension/SlackExtension.php
new file mode 100644
index 0000000..bcdd2e3
--- /dev/null
+++ b/src/Extension/SlackExtension.php
@@ -0,0 +1,344 @@
+<?php
+
+namespace Codeception\Extension;
+
+use Codeception\Events;
+use Codeception\Exception\ExtensionException;
+use Codeception\Extension;
+use Maknz\Slack\Client;
+use Maknz\Slack\Message;
+use PHPUnit\Framework\TestFailure;
+use PHPUnit\Framework\TestResult;
+
+/**
+ * This extension sends the test results to Slack channels.
+ *
+ * To use this extension a valid Slack Webhook URL is required.
+ *
+ * Configuration 'codeception.yaml' example:
+ *
+ *      extensions:
+ *        enabled:
+ *          - SlackExtension
+ *        config:
+ *          SlackExtension:
+ *            webhook: 'https://hooks.slack.com/services/...'
+ */
+class SlackExtension extends Extension
+{
+    const STRATEGY_ALWAYS = 'always';
+    const STRATEGY_FAIL_ONLY = 'failonly';
+    const STRATEGY_FAIL_AND_RECOVER = 'failandrecover';
+    const STRATEGY_STATUS_CHANGE = 'statuschange';
+    const STRATEGY_SUCCESS_ONLY = 'successonly';
+    /**
+     * @var array list events to listen to
+     */
+    public static $events = array(
+        Events::RESULT_PRINT_AFTER => 'sendTestResults',
+    );
+
+    /**
+     * @var Message
+     */
+    protected $message;
+
+    /**
+     * @var string
+     */
+    protected $messagePrefix;
+
+    /**
+     * @var string
+     */
+    protected $messageSuffix = '';
+
+    /**
+     * @var string
+     */
+    protected $messageSuffixOnFail = '';
+
+    /**
+     * @var array Array of slack channels
+     */
+    protected $channels = [];
+
+    /**
+     * @var array Array of slack channels for the special case of failure.
+     *            Defined by Codeception config "channelOnFail".
+     *            This Codeception configuration is optional, otherwise "channel" will be used.
+     */
+    protected $channelOnFail;
+
+    /**
+     * @var boolean If set to true notifications will be send only when at least one test fails.
+     */
+    protected $strategy = self::STRATEGY_ALWAYS;
+
+    protected $strategies = array(
+        self::STRATEGY_ALWAYS,
+        self::STRATEGY_FAIL_ONLY,
+        self::STRATEGY_FAIL_AND_RECOVER,
+        self::STRATEGY_STATUS_CHANGE,
+        self::STRATEGY_SUCCESS_ONLY
+    );
+
+    /**
+     * @var bool Whether or not to yet extended details about failed tests.
+     */
+    protected $extended = false;
+
+    /**
+     * @var bool
+     */
+    protected $lastRunFailed;
+
+    /**
+     * @var \Maknz\Slack\Client
+     */
+    protected $client;
+
+    /**
+     * @var int Maximum length for error messages to be displayed in extended mode.
+     */
+    protected $extendedMaxLength = 80;
+
+    /**
+     * @var int|null The maximum amount of errors to send
+     */
+    protected $extendedMaxErrors = 0;
+
+    /**
+     * Setup Slack client and message object.
+     *
+     * @throws ExtensionException in case required configuration for 'webhook' is missing
+     */
+    public function _initialize()
+    {
+        if (!isset($this->config['webhook']) or empty($this->config['webhook'])) {
+            throw new ExtensionException($this, "configuration for 'webhook' is missing");
+        }
+
+        $this->client = new Client($this->config['webhook']);
+
+        if (isset($this->config['channel'])) {
+            if (true === empty($this->config['channel'])) {
+                throw new ExtensionException(
+                    $this, "SlackExtension: The specified value for key \"channel\" must not be empty."
+                );
+            }
+            $this->channels = explode(',', $this->config['channel']);
+        }
+
+        if (isset($this->config['username'])) {
+            $this->client->setDefaultUsername($this->config['username']);
+        }
+
+        if (isset($this->config['icon'])) {
+            $this->client->setDefaultIcon($this->config['icon']);
+        }
+
+        if (isset($this->config['messagePrefix'])) {
+            $this->messagePrefix = $this->config['messagePrefix'] . ' ';
+        }
+
+        if (isset($this->config['messageSuffix'])) {
+            $messageSuffix = $this->config['messageSuffix'];
+
+            if (substr($this->config['messageSuffix'], 0, 1) === '"') {
+                $messageSuffix = substr($messageSuffix, 1);
+            }
+
+            if (substr($this->config['messageSuffix'], -1) === '"') {
+                $messageSuffix = substr($messageSuffix, 0, strlen($messageSuffix) - 1);
+            }
+
+            $this->messageSuffix = ' ' . $messageSuffix;
+        }
+
+        if (isset($this->config['messageSuffixOnFail'])) {
+            $this->messageSuffixOnFail = ' ' . $this->config['messageSuffixOnFail'];
+        }
+        if (isset($this->config['channelOnFail'])) {
+            if (true === empty($this->config['channelOnFail'])) {
+                throw new ExtensionException(
+                    $this, "SlackExtension: The specified value for key \"channelOnFail\" must not be empty."
+                );
+            }
+            $this->channelOnFail = explode(',', $this->config['channelOnFail']);
+        }
+
+        if (isset($this->config['strategy'])) {
+            if (false === in_array(
+                    $this->config['strategy'],
+                    $this->strategies
+                )
+            ) {
+                throw new ExtensionException(
+                    $this,
+                    '"' . $this->config['strategy'] . '" is not a valid Slack notification "strategy".'
+                    . ' Possible values are: ' . PHP_EOL
+                    . implode(',', $this->strategies)
+                );
+            }
+            $this->strategy = $this->config['strategy'];
+        }
+
+        if (isset($this->config['extended'])
+            && (true === $this->config['extended'] || 'true' === $this->config['extended'])
+        ) {
+            $this->extended = true;
+        }
+
+        if (isset($this->config['extendedMaxErrors'])) {
+            $this->extendedMaxErrors = max((int) $this->config['extendedMaxErrors'], 0);
+        }
+
+        if (isset($this->config['extendedMaxLength'])) {
+            $this->extendedMaxLength = intval($this->config['extendedMaxLength']);
+        }
+
+        $this->lastRunFailed = $this->hasLastRunFailed();
+
+        $this->message = $this->client->createMessage();
+    }
+
+    /**
+     * Sends test results to Slack channels.
+     *
+     * This method is fired when the event 'result.print.after' occurs.
+     * @param \Codeception\Event\PrintResultEvent $e
+     */
+    public function sendTestResults(\Codeception\Event\PrintResultEvent $e)
+    {
+        if (is_null($this->client)) {
+            return;
+        }
+
+        $result = $e->getResult();
+
+        if ($result->wasSuccessful()) {
+
+            if (self::STRATEGY_ALWAYS === $this->strategy
+                || self::STRATEGY_SUCCESS_ONLY === $this->strategy
+                || ($this->lastRunFailed && $this->strategy === self::STRATEGY_FAIL_AND_RECOVER)
+                || ($this->lastRunFailed && $this->strategy === self::STRATEGY_STATUS_CHANGE)
+            ) {
+                $this->sendSuccessMessage($result);
+            }
+
+        } else {
+
+            if (self::STRATEGY_ALWAYS === $this->strategy
+                || self::STRATEGY_FAIL_ONLY === $this->strategy
+                || self::STRATEGY_FAIL_AND_RECOVER === $this->strategy
+                || ($this->strategy === self::STRATEGY_STATUS_CHANGE && false === $this->lastRunFailed)
+            ) {
+                $this->sendFailMessage($result);
+            }
+        }
+    }
+
+    /**
+     * Sends success message to Slack channels.
+     *
+     * @param TestResult $result
+     */
+    private function sendSuccessMessage(TestResult $result)
+    {
+        $numberOfTests = $result->count();
+
+        foreach ($this->channels as $channel) {
+            $this->message->setChannel(trim($channel));
+            $this->message->send(
+                ':white_check_mark: '
+                . $this->messagePrefix
+                . $numberOfTests . ' of ' . $numberOfTests . ' tests passed.'
+                . str_replace('\\n', PHP_EOL, $this->messageSuffix)
+            );
+        }
+    }
+
+    /**
+     * Sends fail message to Slack channels.
+     *
+     * @param TestResult $result
+     */
+    private function sendFailMessage(TestResult $result)
+    {
+        $numberOfTests = $result->count();
+        $numberOfFailedTests = $result->failureCount() + $result->errorCount();
+
+        if (true === $this->extended) {
+            $this->attachExtendedInformation($this->message, $result);
+        }
+
+        $targetChannels = (is_array($this->channelOnFail) && count($this->channelOnFail) > 0) ?
+            $this->channelOnFail : $this->channels;
+
+        foreach ($targetChannels as $channel) {
+            $this->message->setChannel(trim($channel));
+
+            $this->message->send(
+                ':interrobang: '
+                . $this->messagePrefix
+                . $numberOfFailedTests . ' of ' . $numberOfTests . ' tests failed.'
+                . str_replace('\\n', PHP_EOL, $this->messageSuffix)
+                . $this->messageSuffixOnFail
+            );
+        }
+    }
+
+    /**
+     *
+     * @param TestResult $result
+     */
+    private function attachExtendedInformation(Message &$message, TestResult $result) {
+        $fields = [];
+        $failures = array_merge($result->failures(), $result->errors());
+        $omittedFailures = 0;
+        if ($this->extendedMaxErrors > 0) {
+            $omittedFailures = count($failures) - $this->extendedMaxErrors;
+            $failures = array_slice($failures, 0, $this->extendedMaxErrors);
+        }
+
+        foreach ($failures as $failure) {
+            /**
+             * @var $failure TestFailure
+             */
+            $exceptionMsg = strtok($failure->exceptionMessage(), "\n");
+
+            $result = json_decode($exceptionMsg);
+
+            if (json_last_error() === JSON_ERROR_NONE && isset($result->errorMessage)) {
+                $exceptionMsg = $result->errorMessage;
+            }
+
+            if ($this->extendedMaxLength > 0  && strlen($exceptionMsg) > $this->extendedMaxLength) {
+                $exceptionMsg =  substr($exceptionMsg, 0, $this->extendedMaxLength) . ' ...';
+            }
+
+            $fields[] = [
+                'title' => $failure->getTestName(),
+                'value' => $exceptionMsg
+            ];
+        }
+
+        if ($omittedFailures > 0) {
+            $fields[] = [
+                'title' => sprintf('%d other tests...', $omittedFailures),
+                'value' => '',
+            ];
+        }
+
+        $message->attach([
+            'color' => 'danger',
+            'fields' => $fields
+        ]);
+    }
+
+    private function hasLastRunFailed()
+    {
+        return is_file($this->getLogDir() . 'failed');
+    }
+}