Inline.php

@@ -55,12 +55,8 @@ public static function initialize(int $flags, int $parsedLineNumber = null, stri
      *
      * @throws ParseException
      */
-    public static function parse(string $value = null, int $flags = 0, array &$references = []): mixed
+    public static function parse(string $value, int $flags = 0, array &$references = []): mixed
     {
-        if (null === $value) {
-            return '';
-        }
-
         self::initialize($flags);
 
         $value = trim($value);
@@ -161,7 +157,7 @@ public static function dump(mixed $value, int $flags = 0): string
                     } elseif (floor($value) == $value && $repr == $value) {
                         // Preserve float data type since storing a whole number will result in integer value.
                         if (!str_contains($repr, 'E')) {
-                            $repr = $repr.'.0';
+                            $repr .= '.0';
                         }
                     }
                 } else {

Tests/Command/LintCommandTest.php

@@ -26,7 +26,7 @@
  */
 class LintCommandTest extends TestCase
 {
-    private $files;
+    private array $files;
 
     public function testLintCorrectFile()
     {

Tests/InlineTest.php

@@ -29,7 +29,7 @@ protected function setUp(): void
     /**
      * @dataProvider getTestsForParse
      */
-    public function testParse($yaml, $value, $flags = 0)
+    public function testParse(string $yaml, $value, $flags = 0)
     {
         $this->assertSame($value, Inline::parse($yaml, $flags), sprintf('::parse() converts an inline YAML to a PHP structure (%s)', $yaml));
     }
@@ -318,7 +318,6 @@ public static function getTestsForParse()
     {
         return [
             ['', ''],
-            [null, ''],
             ['null', null],
             ['false', false],
             ['true', true],
@@ -578,7 +577,7 @@ public function testParseTimestampAsUnixTimestampByDefault(string $yaml, int $ye
      */
     public function testParseTimestampAsDateTimeObject(string $yaml, int $year, int $month, int $day, int $hour, int $minute, int $second, int $microsecond, string $timezone)
     {
-        $expected = (new \DateTime($yaml))
+        $expected = (new \DateTimeImmutable($yaml))
             ->setTimeZone(new \DateTimeZone('UTC'))
             ->setDate($year, $month, $day)
             ->setTime($hour, $minute, $second, $microsecond);
@@ -603,7 +602,7 @@ public static function getTimestampTests(): array
      */
     public function testParseNestedTimestampListAsDateTimeObject(string $yaml, int $year, int $month, int $day, int $hour, int $minute, int $second, int $microsecond)
     {
-        $expected = (new \DateTime($yaml))
+        $expected = (new \DateTimeImmutable($yaml))
             ->setTimeZone(new \DateTimeZone('UTC'))
             ->setDate($year, $month, $day)
             ->setTime($hour, $minute, $second, $microsecond);

composer.json

@@ -21,7 +21,7 @@
         "symfony/polyfill-ctype": "^1.8"
     },
     "require-dev": {
-        "symfony/console": "^5.4|^6.0"
+        "symfony/console": "^5.4|^6.0|^7.0"
     },
     "conflict": {
         "symfony/console": "<5.4"