Added sniffs to enforce PSR-4 in the `src` and `tests/php/src` directories

phpcs.xml

@@ -43,8 +43,19 @@
 
 	<rule ref="WordPress.Files.FileName.InvalidClassFileName">
 		<exclude-pattern>includes/**/abstract-*.php</exclude-pattern>
-		<exclude-pattern>tests/*</exclude-pattern>
+		<exclude-pattern>tests/</exclude-pattern>
-		<exclude-pattern>src/*</exclude-pattern>
+		<exclude-pattern>src/</exclude-pattern>
+		<exclude-pattern>tests/php/src/</exclude-pattern>
+	</rule>
+
+	<rule ref="Squiz.Classes.ClassFileName">
+		<include-pattern>src/</include-pattern>
+		<include-pattern>tests/php/src/</include-pattern>
+	</rule>
+
+	<rule ref="Squiz.Classes.ValidClassName">
+		<include-pattern>src/</include-pattern>
+		<include-pattern>tests/php/src/</include-pattern>
 	</rule>
 
 	<rule ref="Generic.Commenting">

tests/php/src/.gitkeep

@@ -1 +0,0 @@
-# Placeholder to include the folder. Remove once tests have been written!

tests/php/src/Internal/WCCom/ConnectionHelperTest.php

@@ -1,18 +1,11 @@
 <?php
-/**
- * Tests for ConnectionHelper for WCCom
- *
- * @package WooCommerce|Tests|Internal|WCCom.
- */
 
-namespace Automattic\WooCommerce\Tests\Internal;
+namespace Automattic\WooCommerce\Tests\Internal\WCCom;
 
 use Automattic\WooCommerce\Internal\WCCom\ConnectionHelper;
 
 /**
  * Class ConnectionHelperTest.
- *
- * @package Automattic\WooCommerce\Tests\Internal.
  */
 class ConnectionHelperTest extends \WC_Unit_Test_Case {