diff --git a/.distignore b/.distignore
index acbaa32..2f9c78d 100644
--- a/.distignore
+++ b/.distignore
@@ -6,6 +6,8 @@
 .travis.yml
 behat.yml
 circle.yml
+phpcs.xml.dist
+phpunit.xml.dist
 bin/
 features/
 utils/
diff --git a/.gitignore b/.gitignore
index 0d94f9a..4a485fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,6 @@ vendor/
 *.txt
 *.log
 composer.lock
+phpunit.xml
+phpcs.xml
+.phpcs.xml
diff --git a/composer.json b/composer.json
index 7584ee1..213ece7 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         "wp-cli/wp-cli": "^2"
     },
     "require-dev": {
-        "wp-cli/wp-cli-tests": "^2.0.7"
+        "wp-cli/wp-cli-tests": "^2.1"
     },
     "config": {
         "process-timeout": 7200,
diff --git a/maintenance-mode-command.php b/maintenance-mode-command.php
index bcddc83..21cccb4 100644
--- a/maintenance-mode-command.php
+++ b/maintenance-mode-command.php
@@ -4,10 +4,10 @@
 	return;
 }
 
-$autoload = __DIR__ . '/vendor/autoload.php';
+$wpcli_maintenance_mode_autoloader = __DIR__ . '/vendor/autoload.php';
 
-if ( file_exists( $autoload ) ) {
-	require_once $autoload;
+if ( file_exists( $wpcli_maintenance_mode_autoloader ) ) {
+	require_once $wpcli_maintenance_mode_autoloader;
 }
 
 WP_CLI::add_command( 'maintenance-mode', '\WP_CLI\MaintenanceMode\MaintenanceModeCommand' );
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
new file mode 100644
index 0000000..6ca1c7d
--- /dev/null
+++ b/phpcs.xml.dist
@@ -0,0 +1,54 @@
+<?xml version="1.0"?>
+<ruleset name="WP-CLI-maintenance-mode">
+	<description>Custom ruleset for WP-CLI maintenance-mode-command</description>
+
+	<!--
+	#############################################################################
+	COMMAND LINE ARGUMENTS
+	For help understanding this file: https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-ruleset.xml
+	For help using PHPCS: https://github.com/squizlabs/PHP_CodeSniffer/wiki/Usage
+	#############################################################################
+	-->
+
+	<!-- What to scan. -->
+	<file>.</file>
+
+	<!-- Show progress. -->
+	<arg value="p"/>
+
+	<!-- Strip the filepaths down to the relevant bit. -->
+	<arg name="basepath" value="./"/>
+
+	<!-- Check up to 8 files simultaneously. -->
+	<arg name="parallel" value="8"/>
+
+	<!--
+	#############################################################################
+	USE THE WP_CLI_CS RULESET
+	#############################################################################
+	-->
+
+	<rule ref="WP_CLI_CS"/>
+
+	<!--
+	#############################################################################
+	PROJECT SPECIFIC CONFIGURATION FOR SNIFFS
+	#############################################################################
+	-->
+
+	<!-- For help understanding the `testVersion` configuration setting:
+		 https://github.com/PHPCompatibility/PHPCompatibility#sniffing-your-code-for-compatibility-with-specific-php-versions -->
+	<config name="testVersion" value="5.4-"/>
+
+	<!-- Verify that everything in the global namespace is either namespaced or prefixed.
+		 See: https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/wiki/Customizable-sniff-properties#naming-conventions-prefix-everything-in-the-global-namespace -->
+	<rule ref="WordPress.NamingConventions.PrefixAllGlobals">
+		<properties>
+			<property name="prefixes" type="array">
+				<element value="WP_CLI\MaintenanceMode"/><!-- Namespaces. -->
+				<element value="wpcli_maintenance_mode"/><!-- Global variables and such. -->
+			</property>
+		</properties>
+	</rule>
+
+</ruleset>