[TASK] Add basic PHP tests (lint, codesniffer)

.Build/.php_cs

+<?php
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+/**
+ * This file represents the configuration for Code Sniffing PSR-2-related
+ * automatic checks of coding guidelines
+ * Install @fabpot's great php-cs-fixer tool via
+ *
+ *  $ composer global require friendsofphp/php-cs-fixer
+ *
+ * And then simply run
+ *
+ *  $ php-cs-fixer fix --config ../Build/.php_cs
+ *
+ * inside the TYPO3 directory. Warning: This may take up to 10 minutes.
+ *
+ * For more information read:
+ *     https://www.php-fig.org/psr/psr-2/
+ *     https://cs.sensiolabs.org
+ */
+if (PHP_SAPI !== 'cli') {
+    die('This script supports command line usage only. Please check your command.');
+}
+// Define in which folders to search and which folders to exclude
+// Exclude some directories that are excluded by Git anyways to speed up the sniffing
+$finder = PhpCsFixer\Finder::create()
+    ->exclude('vendor')
+    ->exclude('typo3temp')
+    ->in(__DIR__ . '/../../');
+// Return a Code Sniffing configuration using
+// all sniffers needed for PSR-2
+// and additionally:
+//  - Remove leading slashes in use clauses.
+//  - PHP single-line arrays should not have trailing comma.
+//  - Single-line whitespace before closing semicolon are prohibited.
+//  - Remove unused use statements in the PHP source code
+//  - Ensure Concatenation to have at least one whitespace around
+//  - Remove trailing whitespace at the end of blank lines.
+return PhpCsFixer\Config::create()->setRiskyAllowed(true)->setRules([
+        '@PSR2' => true,
+        '@DoctrineAnnotation' => true,
+        'no_leading_import_slash' => true,
+        'no_trailing_comma_in_singleline_array' => true,
+        'no_singleline_whitespace_before_semicolons' => true,
+        'no_unused_imports' => true,
+        'concat_space' => ['spacing' => 'one'],
+        'no_whitespace_in_blank_line' => true,
+        'ordered_imports' => true,
+        'single_quote' => true,
+        'no_empty_statement' => true,
+        'no_extra_consecutive_blank_lines' => true,
+        'phpdoc_no_package' => true,
+        'phpdoc_scalar' => true,
+        'no_blank_lines_after_phpdoc' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'whitespace_after_comma_in_array' => true,
+        'function_typehint_space' => true,
+        'hash_to_slash_comment' => true,
+        'no_alias_functions' => true,
+        'lowercase_cast' => true,
+        'no_leading_namespace_whitespace' => true,
+        'native_function_casing' => true,
+        'no_short_bool_cast' => true,
+        'no_unneeded_control_parentheses' => true,
+        'phpdoc_no_empty_return' => true,
+        'phpdoc_trim' => true,
+        'no_superfluous_elseif' => true,
+        'no_useless_else' => true,
+        'phpdoc_types' => true,
+        'phpdoc_types_order' => ['null_adjustment' => 'always_last', 'sort_algorithm' => 'none'],
+        'return_type_declaration' => ['space_before' => 'none'],
+        'cast_spaces' => ['space' => 'none'],
+        'declare_equal_normalize' => ['space' => 'single'],
+        'dir_constant' => true,
+    ])->setFinder($finder);

.gitlab-ci.yml

 include:
-    - remote: 'https://git.spooner.io/ci-templates/composer-packages/-/raw/main/composer-packages.yml'
+  - remote: 'https://git.spooner.io/ci-templates/composer-packages/-/raw/main/composer-packages.yml'
 
 stages:
-    - packages
+  - test
+  - packages
+
+test:php:lint:
+  stage: test
+  image: php:7.4
+  variables:
+    GIT_STRATEGY: clone
+  script:
+    - find . -type f -name '*.php' -exec php -l {} \; | (! grep -v "No syntax errors detected" )
+
+test:php:codesniffer:
+  stage: test
+  image: ekreative/php-cs-fixer:2
+  variables:
+    GIT_STRATEGY: "clone"
+  script:
+    - php-cs-fixer fix --dry-run --config=.Build/.php_cs --diff