diff --git a/.circleci/apache/mailpoet.loc.conf b/.circleci/apache/mailpoet.loc.conf
index 68b4ac95f3..7130cf473d 100644
--- a/.circleci/apache/mailpoet.loc.conf
+++ b/.circleci/apache/mailpoet.loc.conf
@@ -1,6 +1,4 @@
-Listen 8080
-
-<VirtualHost *:8080>
+<VirtualHost *:80>
   UseCanonicalName Off
   ServerName mailpoet.loc
   DocumentRoot /home/circleci/mailpoet/wordpress
@@ -8,6 +6,9 @@ Listen 8080
   LogLevel notice
 
   <Directory /home/circleci/mailpoet/wordpress>
+    Options Indexes FollowSymLinks
+    AllowOverride All
+    RewriteEngine On
     Require all granted
   </Directory>
 </VirtualHost>
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 691e3ca16e..3fbdd28cb7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -120,7 +120,38 @@ jobs:
       - run:
           name: "PHP Unit tests"
           command: |
-            WP_TEST_PATH="/home/circleci/mailpoet/wordpress" ./do t:u --xml
+            ./do t:u --xml
+      - store_test_results:
+          path: tests/_output
+      - store_artifacts:
+          path: tests/_output
+          destination: codeception
+      - store_artifacts:
+          path: /tmp/fake-mailer/
+          destination: fake-mailer
+  php7_multisite:
+    working_directory: /home/circleci/mailpoet
+    docker:
+      - image: circleci/php:7.1-apache-browsers
+      - image: circleci/mysql:5.7
+    environment:
+      TZ: /usr/share/zoneinfo/Etc/UTC
+    steps:
+      - checkout
+      - run:
+          name: "Set up virtual host"
+          command: echo 127.0.0.1 mailpoet.loc | sudo tee -a /etc/hosts
+      - restore_cache:
+          key: composer-{{ checksum "composer.json" }}-{{ checksum "composer.lock" }}
+      - restore_cache:
+          key: npm-{{ checksum "package.json" }}
+      - run:
+          name: "Set up test environment"
+          command: source ./.circleci/setup.bash && setup php7_multisite
+      - run:
+          name: "PHP Unit tests"
+          command: |
+            ./do t:multisite-unit --xml
       - store_test_results:
           path: tests/_output
       - store_artifacts:
@@ -135,4 +166,5 @@ workflows:
     jobs:
       - qa_js_php5
       - php7
-      - acceptance_tests
+      - php7_multisite      
+      - acceptance_tests
\ No newline at end of file
diff --git a/.circleci/setup.bash b/.circleci/setup.bash
index 00ae6ca9ef..53630063f7 100644
--- a/.circleci/setup.bash
+++ b/.circleci/setup.bash
@@ -2,8 +2,11 @@
 
 function setup {
 	local version=$1
+	local wp_cli_wordpress_path="--path=wordpress"
+	local wp_cli_allow_root="--allow-root"
+
 	# install PHP dependencies for WordPress
-	if [[ $version == "php7" ]]; then
+	if [[ $version == "php7" ]] || [[ $version == "php7_multisite" ]]; then
 		echo "deb http://packages.dotdeb.org jessie all" | sudo tee -a /etc/apt/sources.list.d/dotdeb.list
 		echo "deb-src http://packages.dotdeb.org jessie all" | sudo tee -a /etc/apt/sources.list.d/dotdeb.list
 		wget -qO - http://www.dotdeb.org/dotdeb.gpg | sudo apt-key add -
@@ -15,35 +18,66 @@ function setup {
 		sudo apt-get install mysql-client php5-mysql zlib1g-dev
 		sudo docker-php-ext-install mysql mysqli pdo pdo_mysql zip
 	fi
+
 	# Add a fake sendmail mailer
 	sudo cp ./.circleci/fake-sendmail.php /usr/local/bin/
+
 	# configure Apache
 	sudo cp ./.circleci/mailpoet_php.ini /usr/local/etc/php/conf.d/
 	sudo cp ./.circleci/apache/mailpoet.loc.conf /etc/apache2/sites-available
+	sudo a2dissite 000-default.conf
 	sudo a2ensite mailpoet.loc
 	sudo a2enmod rewrite
 	sudo service apache2 restart
+
 	# Install NodeJS+NPM
 	curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -
 	sudo apt-get install nodejs build-essential
+
 	# install plugin dependencies
 	curl -sS https://getcomposer.org/installer | php
 	./composer.phar install
 	./do install
-	# Set up Wordpress
+
+	# Set up WordPress
 	mysql -h 127.0.0.1 -u root -e "create database wordpress"
 	curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
 	chmod +x wp-cli.phar
-	./wp-cli.phar core download --allow-root --path=wordpress
+	sudo mv wp-cli.phar /usr/local/bin/wp
+	wp core download $wp_cli_wordpress_path $wp_cli_allow_root
+
 	# Generate `wp-config.php` file with debugging enabled
-	echo "define(\"WP_DEBUG\", true);" | ./wp-cli.phar core config --allow-root --dbname=wordpress --dbuser=root --dbhost=127.0.0.1 --path=wordpress --extra-php
+	echo "define(\"WP_DEBUG\", true);" | wp core config --dbname=wordpress --dbuser=root --dbhost=127.0.0.1 --extra-php $wp_cli_wordpress_path $wp_cli_allow_root
+
+	# Change default table prefix
 	sed -i "s/\$table_prefix = 'wp_';/\$table_prefix = 'mp_';/" ./wordpress/wp-config.php
+
 	# Install WordPress
-	./wp-cli.phar core install --allow-root --admin_name=admin --admin_password=admin --admin_email=admin@mailpoet.loc --url=http://mailpoet.loc:8080 --title=WordPress --path=wordpress
+    if [[ $version == "php7_multisite" ]]; then
+        # Configure multisite environment
+    	wp core multisite-install --admin_name=admin --admin_password=admin --admin_email=admin@mailpoet.loc --url=http://mailpoet.loc --title="WordPress MultiSite" $wp_cli_wordpress_path $wp_cli_allow_root
+    	cp ./.circleci/wordpress/.htaccess ./wordpress/
+
+    	# Add a second blog
+    	wp site create --slug=php7_multisite $wp_cli_wordpress_path $wp_cli_allow_root
+    	echo "WP_TEST_MULTISITE_SLUG=php7_multisite" >> .env
+    	echo "WP_TEST_PATH_MULTISITE=/home/circleci/mailpoet/wordpress" >> .env
+    	echo "HTTP_HOST=mailpoet.loc" >> .env
+
+    	# Add a third dummy blog
+        wp site create --slug=dummy_multisite $wp_cli_wordpress_path $wp_cli_allow_root
+    else
+    	wp core install --admin_name=admin --admin_password=admin --admin_email=admin@mailpoet.loc --url=http://mailpoet.loc --title="WordPress Single" $wp_cli_wordpress_path $wp_cli_allow_root
+    	echo "WP_TEST_PATH=/home/circleci/mailpoet/wordpress" >> .env
+    fi
+
 	# Softlink plugin to plugin path
 	ln -s ../../.. wordpress/wp-content/plugins/mailpoet
-	./wp-cli.phar plugin activate mailpoet --path=wordpress
-	# Create .env file with correct path to WP installation
-	# TODO: Remove this line after PR gets merged and CircleCI env variables change
-	echo "WP_TEST_PATH=\"/home/circleci/mailpoet/wordpress\"" > .env
-}
+
+	# Activate plugin
+	if [[ $version == "php7_multisite" ]]; then
+	    wp plugin activate mailpoet --url=http://mailpoet.loc/php7_multisite/ $wp_cli_wordpress_path $wp_cli_allow_root
+	else
+	    wp plugin activate mailpoet $wp_cli_wordpress_path $wp_cli_allow_root
+	fi
+}
\ No newline at end of file
diff --git a/.circleci/wordpress/.htaccess b/.circleci/wordpress/.htaccess
new file mode 100644
index 0000000000..01e10f8805
--- /dev/null
+++ b/.circleci/wordpress/.htaccess
@@ -0,0 +1,12 @@
+RewriteEngine On
+RewriteBase /
+RewriteRule ^index\.php$ - [L]
+
+RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
+
+RewriteCond %{REQUEST_FILENAME} -f [OR]
+RewriteCond %{REQUEST_FILENAME} -d
+RewriteRule ^ - [L]
+RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
+RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
+RewriteRule . index.php [L]
diff --git a/.env.sample b/.env.sample
index 8aadc87daf..09cc17ca5e 100644
--- a/.env.sample
+++ b/.env.sample
@@ -1,4 +1,6 @@
 WP_TEST_PATH="/var/www/wordpress"
+WP_TEST_PATH_MULTISITE="/var/www/wordpress"
+WP_TEST_MULTISITE_SLUG=""
 WP_TEST_ENABLE_NETWORK_TESTS="true"
 WP_TEST_IMPORT_MAILCHIMP_API=""
 WP_TEST_IMPORT_MAILCHIMP_LISTS="" // (separated with comma)
@@ -16,4 +18,5 @@ WP_TEST_MAILER_SMTP_LOGIN=""
 WP_TEST_MAILER_SMTP_PASSWORD=""
 WP_SVN_USERNAME=""
 WP_SVN_PASSWORD=""
-WP_TRANSIFEX_API_TOKEN=""
\ No newline at end of file
+WP_TRANSIFEX_API_TOKEN=""
+HTTP_HOST="" // URL of your site (used for multisite env and equals to DOMAIN_CURRENT_SITE from wp-config.php)
\ No newline at end of file
diff --git a/RoboFile.php b/RoboFile.php
index 8377ee0b0e..5876d21bb9 100644
--- a/RoboFile.php
+++ b/RoboFile.php
@@ -153,17 +153,30 @@ class RoboFile extends \Robo\Tasks {
     return $this->_exec('./tasks/transifex_init.sh');
   }
 
-  function testUnit($opts=['file' => null, 'xml' => false]) {
+  function testUnit($opts=['file' => null, 'xml' => false, 'multisite' => false]) {
     $this->loadEnv();
 
-    $command = 'vendor/bin/codecept run unit -c codeception.unit.yml -f '.(($opts['file']) ? $opts['file'] : '');
+    $command = 'vendor/bin/codecept run unit -c codeception.unit.yml';
+
+    if($opts['multisite']) {
+      $command = 'MULTISITE=true ' . $command;
+    }
+
+    if($opts['file']) {
+      $command .= ' -f ' . $opts['file'];
+    }
 
     if($opts['xml']) {
       $command .= ' --xml';
     }
+
     return $this->_exec($command);
   }
 
+  function testMultisiteUnit($opts=['file' => null, 'xml' => false, 'multisite' => true]) {
+    return $this->testUnit($opts);
+  }
+
   function testCoverage($opts=['file' => null, 'xml' => false]) {
     $this->loadEnv();
     $command = join(' ', array(
diff --git a/tests/_bootstrap.php b/tests/_bootstrap.php
index 781d5f8019..79ed66a858 100644
--- a/tests/_bootstrap.php
+++ b/tests/_bootstrap.php
@@ -1,6 +1,12 @@
 <?php
 
-$wp_load_file = getenv('WP_TEST_PATH') . '/wp-load.php';
+if((boolean)getenv('MULTISITE') === true) {
+  // REQUEST_URI needs to be set for WP to load the proper subsite where MailPoet is activated
+  $_SERVER['REQUEST_URI'] = '/' . getenv('WP_TEST_MULTISITE_SLUG');
+  $wp_load_file = getenv('WP_TEST_PATH_MULTISITE') . '/wp-load.php';
+} else {
+  $wp_load_file = getenv('WP_TEST_PATH') . '/wp-load.php';
+}
 require_once($wp_load_file);
 
 $console = new \Codeception\Lib\Console\Output([]);