Common::escapeshellcmd(): add tests

This adds tests for another method which has different behaviour between Windows and other OS-es.

tests/Core/Util/Common/EscapeshellcmdTest.php

@@ -0,0 +1,91 @@
+<?php
+/**
+ * Tests for the \PHP_CodeSniffer\Util\Common::escapeshellcmd() method.
+ *
+ * @author    Juliette Reinders Folmer <phpcs_nospam@adviesenzo.nl>
+ * @copyright 2024 PHPCSStandards and contributors
+ * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Tests\Core\Util\Common;
+
+use PHP_CodeSniffer\Util\Common;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Tests for the \PHP_CodeSniffer\Util\Common::escapeshellcmd() method.
+ *
+ * @covers \PHP_CodeSniffer\Util\Common::escapeshellcmd
+ * @group  Windows
+ */
+final class EscapeshellcmdTest extends TestCase
+{
+
+
+    /**
+     * Test escaping shell commands.
+     *
+     * @param string $command     The command provided.
+     * @param string $expected    Expected function output.
+     * @param string $expectedWin Optional. Expected function output on Windows.
+     *                            Only needs to be passed if the output on Windows would be different.
+     *
+     * @dataProvider dataEscapeshellcmd
+     *
+     * @return void
+     */
+    public function testEscapeshellcmd($command, $expected, $expectedWin=null)
+    {
+        if (stripos(PHP_OS, 'WIN') === 0 && empty($expectedWin) === false) {
+            $expected = $expectedWin;
+        }
+
+        $this->assertSame($expected, Common::escapeshellcmd($command));
+
+    }//end testEscapeshellcmd()
+
+
+    /**
+     * Data provider.
+     *
+     * Note: we're only testing the PHPCS functionality, not the PHP native `escapeshellcmd()`
+     * function (as that's not our responsibility).
+     *
+     * @see testEscapeshellcmd()
+     *
+     * @return array<string, array<string, string>>
+     */
+    public static function dataEscapeshellcmd()
+    {
+        return [
+            'Command is empty string'                                        => [
+                'text'     => '',
+                'expected' => '',
+            ],
+            'Command is simple string'                                       => [
+                'text'     => 'csslint',
+                'expected' => 'csslint',
+            ],
+            'Command containing characters which PHP escapes'                => [
+                'text'        => '&#;`|*?~<>^()[]{}$\,%!',
+                'expected'    => '\&\#\;\`\|\*\?\~\<\>\^\(\)\[\]\{\}\$\\,%!',
+                'expectedWin' => '^&^#^;^`^|^*^?^~^<^>^^^(^)^[^]^{^}^$^\,^%^!',
+            ],
+            // @link https://github.com/squizlabs/PHP_CodeSniffer/pull/3214
+            'Command containing spaces, which can cause problems on Windows' => [
+                'text'        => 'C:\Program Files\nodejs\csslint.cmd',
+                'expected'    => 'C:\\Program Files\\nodejs\\csslint.cmd',
+                'expectedWin' => 'C:^\Program^ Files^\nodejs^\csslint.cmd',
+            ],
+            // @link https://github.com/php/doc-en/pull/511
+            'Command containing spaces with additional arguments'            => [
+                'text'        => 'php -f ./~home/path to/file.php',
+                'expected'    => 'php -f ./\~home/path to/file.php',
+                'expectedWin' => 'php^ -f^ ./^~home/path^ to/file.php',
+            ],
+        ];
+
+    }//end dataEscapeshellcmd()
+
+
+}//end class