Tests: use PSR-4

.phpcs.xml.dist

@@ -163,4 +163,12 @@
 		<exclude-pattern>/src/watchers/republished-post-watcher\.php$</exclude-pattern>
 	</rule>
 
+	<!-- The below two issues will be fixed in YoastCS 3.0, after which these excludes can be removed. -->
+	<rule ref="Yoast.Commenting.FileComment.Unnecessary">
+		<exclude-pattern>/tests/*/bootstrap\.php$</exclude-pattern>
+	</rule>
+	<rule ref="Yoast.Files.FileName.InvalidClassFileName">
+		<exclude-pattern>/tests/*\.php$</exclude-pattern>
+	</rule>
+
 </ruleset>

composer.json

@@ -37,9 +37,9 @@
 		]
 	},
 	"autoload-dev": {
-		"classmap": [
-			"tests/"
-		]
+		"psr-4": {
+			"Yoast\\WP\\Duplicate_Post\\Tests\\": "tests/"
+		}
 	},
 	"config": {
 		"allow-plugins": {

phpunit-wp.xml.dist

@@ -4,7 +4,7 @@
 	xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/8.5/phpunit.xsd"
 	backupGlobals="false"
 	backupStaticAttributes="false"
-	bootstrap="tests/wp/bootstrap.php"
+	bootstrap="tests/WP/bootstrap.php"
 	colors="true"
 	convertDeprecationsToExceptions="true"
 	convertErrorsToExceptions="true"
@@ -20,7 +20,7 @@
 	>
 	<testsuites>
 		<testsuite name="duplicatepost">
-			<directory suffix="-test.php">./tests/wp</directory>
+			<directory suffix="Test.php">./tests/WP</directory>
 		</testsuite>
 	</testsuites>
 

phpunit.xml.dist

@@ -4,7 +4,7 @@
 	xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/8.5/phpunit.xsd"
 	backupGlobals="false"
 	backupStaticAttributes="false"
-	bootstrap="tests/unit/bootstrap.php"
+	bootstrap="tests/Unit/bootstrap.php"
 	colors="true"
 	convertDeprecationsToExceptions="true"
 	convertErrorsToExceptions="true"
@@ -20,7 +20,7 @@
 	>
 	<testsuites>
 		<testsuite name="duplicatepost">
-			<directory suffix="-test.php">./tests/unit</directory>
+			<directory suffix="Test.php">./tests/Unit</directory>
 		</testsuite>
 	</testsuites>
 

tests/Unit/bootstrap.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ * PHPUnit bootstrap file
+ *
+ * @package Yoast\WP\Duplicate_Post\Tests
+ */
+
+namespace Yoast\WP\Duplicate_Post\Tests\Unit;
+
+\define( 'OBJECT', 'OBJECT' );
+\define( 'ARRAY_A', 'ARRAY_A' );
+\define( 'ARRAY_N', 'ARRAY_N' );
+
+\define( 'DUPLICATE_POST_FILE', '/var/www/html/wp-content/plugins/duplicate-post/duplicate-post.php' );
+\define( 'DUPLICATE_POST_CURRENT_VERSION', '4.0' );
+
+if ( \file_exists( \dirname( __DIR__, 2 ) . '/vendor/autoload.php' ) === false ) {
+	echo \PHP_EOL, 'ERROR: Run `composer install` to generate the autoload files before running the unit tests.', \PHP_EOL;
+	exit( 1 );
+}
+
+require_once __DIR__ . '/../../vendor/yoast/wp-test-utils/src/BrainMonkey/bootstrap.php';
+require_once __DIR__ . '/../../vendor/autoload.php';

tests/wp/bootstrap.php → tests/WP/bootstrap.php

@@ -5,28 +5,30 @@
  * @package Yoast\WP\Duplicate_Post\Tests
  */
 
+namespace Yoast\WP\Duplicate_Post\Tests\WP;
+
 use Yoast\WPTestUtils\WPIntegration;
 
 // Disable xdebug backtrace.
-if ( function_exists( 'xdebug_disable' ) ) {
-	xdebug_disable();
+if ( \function_exists( 'xdebug_disable' ) ) {
+	\xdebug_disable();
 }
 
-echo 'Welcome to the Duplicate Post Test Suite' . PHP_EOL;
-echo 'Version: 1.0' . PHP_EOL . PHP_EOL;
+echo 'Welcome to the Duplicate Post Test Suite' . \PHP_EOL;
+echo 'Version: 1.0' . \PHP_EOL . \PHP_EOL;
 
 /*
  * Load the plugin(s).
  */
-require_once dirname( __DIR__, 2 ) . '/vendor/yoast/wp-test-utils/src/WPIntegration/bootstrap-functions.php';
+require_once \dirname( __DIR__, 2 ) . '/vendor/yoast/wp-test-utils/src/WPIntegration/bootstrap-functions.php';
 
 // Get access to tests_add_filter() function.
 require_once WPIntegration\get_path_to_wp_test_dir() . 'includes/functions.php';
 
-tests_add_filter(
+\tests_add_filter(
 	'muplugins_loaded',
 	function() {
-		require_once dirname( __DIR__, 2 ) . '/duplicate-post.php';
+		require_once \dirname( __DIR__, 2 ) . '/duplicate-post.php';
 	}
 );