Merge branch '5.4' into 6.4

* 5.4:
  fix the directory separator being used
  ignore case of built-in cmd.exe commands
  [Process] Improve test cleanup by unlinking in a `finally` block
  [Process] Return built-in cmd.exe commands directly in ExecutableFinder

Author: xabbuh

ExecutableFinder.php

@@ -20,6 +20,13 @@
 class ExecutableFinder
 {
     private array $suffixes = ['.exe', '.bat', '.cmd', '.com'];
+    private const CMD_BUILTINS = [
+        'assoc', 'break', 'call', 'cd', 'chdir', 'cls', 'color', 'copy', 'date',
+        'del', 'dir', 'echo', 'endlocal', 'erase', 'exit', 'for', 'ftype', 'goto',
+        'help', 'if', 'label', 'md', 'mkdir', 'mklink', 'move', 'path', 'pause',
+        'popd', 'prompt', 'pushd', 'rd', 'rem', 'ren', 'rename', 'rmdir', 'set',
+        'setlocal', 'shift', 'start', 'time', 'title', 'type', 'ver', 'vol',
+    ];
 
     /**
      * Replaces default suffixes of executable.
@@ -50,6 +57,11 @@ public function addSuffix(string $suffix)
      */
     public function find(string $name, ?string $default = null, array $extraDirs = []): ?string
     {
+        // windows built-in commands that are present in cmd.exe should not be resolved using PATH as they do not exist as exes
+        if ('\\' === \DIRECTORY_SEPARATOR && \in_array(strtolower($name), self::CMD_BUILTINS, true)) {
+            return $name;
+        }
+
         $dirs = array_merge(
             explode(\PATH_SEPARATOR, getenv('PATH') ?: getenv('Path')),
             $extraDirs

Tests/ExecutableFinderTest.php

@@ -125,18 +125,20 @@ public function testFindBatchExecutableOnWindows()
 
         $target = tempnam(sys_get_temp_dir(), 'example-windows-executable');
 
-        touch($target);
-        touch($target.'.BAT');
-
-        $this->assertFalse(is_executable($target));
+        try {
+            touch($target);
+            touch($target.'.BAT');
 
-        putenv('PATH='.sys_get_temp_dir());
+            $this->assertFalse(is_executable($target));
 
-        $finder = new ExecutableFinder();
-        $result = $finder->find(basename($target), false);
+            putenv('PATH='.sys_get_temp_dir());
 
-        unlink($target);
-        unlink($target.'.BAT');
+            $finder = new ExecutableFinder();
+            $result = $finder->find(basename($target), false);
+        } finally {
+            unlink($target);
+            unlink($target.'.BAT');
+        }
 
         $this->assertSamePath($target.'.BAT', $result);
     }
@@ -146,17 +148,31 @@ public function testFindBatchExecutableOnWindows()
      */
     public function testEmptyDirInPath()
     {
-        putenv(sprintf('PATH=%s:', \dirname(\PHP_BINARY)));
+        putenv(sprintf('PATH=%s%s', \dirname(\PHP_BINARY), \PATH_SEPARATOR));
 
-        touch('executable');
-        chmod('executable', 0700);
+        try {
+            touch('executable');
+            chmod('executable', 0700);
 
-        $finder = new ExecutableFinder();
-        $result = $finder->find('executable');
+            $finder = new ExecutableFinder();
+            $result = $finder->find('executable');
 
-        $this->assertSame('./executable', $result);
+            $this->assertSame('./executable', $result);
+        } finally {
+            unlink('executable');
+        }
+    }
 
-        unlink('executable');
+    public function testFindBuiltInCommandOnWindows()
+    {
+        if ('\\' !== \DIRECTORY_SEPARATOR) {
+            $this->markTestSkipped('Can be only tested on windows');
+        }
+
+        $finder = new ExecutableFinder();
+        $this->assertSame('rmdir', strtolower($finder->find('RMDIR')));
+        $this->assertSame('cd', strtolower($finder->find('cd')));
+        $this->assertSame('move', strtolower($finder->find('MoVe')));
     }
 
     private function assertSamePath($expected, $tested)