diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index c7e845b..3dd5f73 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -10,14 +10,16 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Build the docker-compose stack
-        run: docker-compose -f docker-compose.yml -p yii2-import build
+        run: docker build -t yii2-import:latest -f ./tests/docker/Dockerfile ./tests/docker
       - name: Install composer packages
-        run: docker run --rm --volume $PWD:/app yii2-import_application composer install
+        run: docker run --rm --volume $PWD:/app yii2-import:latest composer install
       - name: Run docker containers
         run: docker-compose -f docker-compose.yml up -d
       - name: Check running containers
-        run: docker ps -a
+        run: docker-compose ps
       - name: Check logs
-        run: docker logs yii2-import
+        run: docker-compose logs
       - name: Run test suite
         run: docker-compose exec -T application composer test
+      - name: Stop docker containers
+        run: docker-compose -f docker-compose.yml down
diff --git a/LICENSE b/LICENSE
index d5cf4db..da018da 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2015 bankrot
+Copyright (c) 2020 eLFuvo
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 9e48cef..4c8fcec 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ to the "require" section of your `composer.json` file.
 Configure
 ---------
 
-Configure desired storage option for the import result and the available import adapters
+Configure desired storage option for the import result and available import adapters
 
 ```php
 // in common app config
@@ -158,7 +158,7 @@ Also, the validation rules set automatically type of conversion of import data t
 
 Important! Import file must have column(s) with unique (identity) values for updating existing models.
 
-Yii2 queue component must be configured for executing ImportJob.
+Yii2 [queue](https://github.com/yiisoft/yii2-queue/blob/master/docs/guide/README.md) component must be configured for executing ImportJob.
 
 Screenshots
 ------------
diff --git a/composer.json b/composer.json
index 60f0b71..b0c879b 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
     "autoload": {
         "psr-4": {
             "elfuvo\\import\\": "src",
-            "elfuvo\\import\\app\\": "tests/app"
+            "elfuvo\\import\\tests\\app\\": "tests/app"
         }
     },
     "require-dev": {
diff --git a/src/ImportService.php b/src/ImportService.php
index a289103..bb15ff6 100644
--- a/src/ImportService.php
+++ b/src/ImportService.php
@@ -193,6 +193,7 @@ public function importBatch(): bool
                 /** @var Model|ActiveRecord $model */
                 $model = clone $this->model;
                 // some behaviors can be detached for the original model
+                // so detach its for cloned model
                 foreach ($model->getBehaviors() as $behavior => $config) {
                     if (!in_array($behavior, $behaviors)) {
                         $model->detachBehavior($behavior);
diff --git a/tests/app/config/common.php b/tests/app/config/common.php
index 92221a6..d215ad7 100644
--- a/tests/app/config/common.php
+++ b/tests/app/config/common.php
@@ -8,7 +8,7 @@
 
 return [
     'id' => 'tests',
-    'controllerNamespace' => 'elfuvo\\import\\app\\controllers',
+    'controllerNamespace' => 'elfuvo\\import\\tests\\app\\controllers',
     'viewPath' => '@app/views',
     'defaultRoute' => 'default/upload-file-import',
     'name' => 'Import wizard',
@@ -34,8 +34,8 @@
                     \elfuvo\import\adapter\AdapterImportCsv::class,
                 ]
             ],
-            yii\web\Request::class => [
-                'class' => yii\web\Request::class,
+            \yii\web\Request::class => [
+                'class' => \yii\web\Request::class,
                 'enableCookieValidation' => false,
                 'enableCsrfValidation' => false,
             ]
@@ -43,14 +43,8 @@
     ],
     'modules' => [],
     'components' => [
-        'redis' => [
-            'class' => 'yii\redis\Connection',
-            'hostname' => 'localhost',
-            'port' => 6379,
-            'database' => 0,
-        ],
         'cache' => [
-            'class' => yii\caching\FileCache::class,
+            'class' => \yii\caching\FileCache::class,
             'keyPrefix' => 'import-wizard',
         ],
         'queue' => [
diff --git a/tests/app/config/test.php b/tests/app/config/test.php
index d1cbc06..98b83ee 100644
--- a/tests/app/config/test.php
+++ b/tests/app/config/test.php
@@ -9,7 +9,7 @@
 return \yii\helpers\ArrayHelper::merge(require('common.php'),
     [
         'id' => 'tests',
-        'controllerNamespace' => 'elfuvo\\import\\app\\controllers',
+        'controllerNamespace' => 'elfuvo\\import\\tests\\app\\controllers',
         'viewPath' => '@app/views',
         'defaultRoute' => 'default/upload-file-import',
         'name' => 'Import wizard',
diff --git a/tests/app/controllers/DefaultController.php b/tests/app/controllers/DefaultController.php
index d7919c3..c8d7bbe 100644
--- a/tests/app/controllers/DefaultController.php
+++ b/tests/app/controllers/DefaultController.php
@@ -6,12 +6,12 @@
  * Time: 21:33
  */
 
-namespace elfuvo\import\app\controllers;
+namespace elfuvo\import\tests\app\controllers;
 
 use elfuvo\import\actions\ProgressAction;
 use elfuvo\import\actions\SetupAction;
 use elfuvo\import\actions\UploadFileAction;
-use elfuvo\import\app\models\Review;
+use elfuvo\import\tests\app\models\Review;
 use yii\web\Controller;
 use yii\web\ErrorAction;
 
diff --git a/tests/app/models/Review.php b/tests/app/models/Review.php
index 78dffa4..56c10fc 100644
--- a/tests/app/models/Review.php
+++ b/tests/app/models/Review.php
@@ -6,7 +6,7 @@
  * Time: 21:33
  */
 
-namespace elfuvo\import\app\models;
+namespace elfuvo\import\tests\app\models;
 
 use Yii;
 use yii\base\Model;
@@ -15,7 +15,7 @@
 /**
  *
  * Class Review
- * @package elfuvo\import\app\models
+ * @package elfuvo\import\tests\app\models
  */
 class Review extends Model
 {
@@ -105,7 +105,7 @@ public function rules()
      * @param null $attributeNames
      * @return bool
      */
-    public function save($runValidation = true, $attributeNames = null)
+    public function save($runValidation = true, $attributeNames = null): bool
     {
         if ($this->validate()) {
             self::getList();
diff --git a/tests/docker/Dockerfile b/tests/docker/Dockerfile
index bd9eda2..e1fa9f0 100644
--- a/tests/docker/Dockerfile
+++ b/tests/docker/Dockerfile
@@ -53,22 +53,8 @@ memory_limit=-1\n\
 
 ENV COMPOSER_ALLOW_SUPERUSER 1
 ENV COMPOSER_HOME /tmp
-ENV COMPOSER_VERSION 1.9.3
 
-RUN set -eux; \
-  curl --silent --fail --location --retry 3 --output /tmp/installer.php --url https://raw.githubusercontent.com/composer/getcomposer.org/cb19f2aa3aeaa2006c0cd69a7ef011eb31463067/web/installer; \
-  php -r " \
-    \$signature = '48e3236262b34d30969dca3c37281b3b4bbe3221bda826ac6a9a62d6444cdb0dcd0615698a5cbe587c3f0fe57a54d8f5'; \
-    \$hash = hash('sha384', file_get_contents('/tmp/installer.php')); \
-    if (!hash_equals(\$signature, \$hash)) { \
-      unlink('/tmp/installer.php'); \
-      echo 'Integrity check failed, installer is either corrupt or worse.' . PHP_EOL; \
-      exit(1); \
-    }"; \
-  php /tmp/installer.php --no-ansi --install-dir=/usr/bin --filename=composer --version=${COMPOSER_VERSION}; \
-  composer --ansi --version --no-interaction; \
-  rm -f /tmp/installer.php; \
-  find /tmp -type d -exec chmod -v 1777 {} +
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin --filename=composer
 
 COPY docker-entrypoint.sh /docker-entrypoint.sh