Fixing code issues reported by the tools

Author: JakeQZ

src/Value/Expression.php

@@ -1,8 +1,9 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabberworm\CSS\Value;
 
-use Sabberworm\CSS\OutputFormat;
 use Sabberworm\CSS\Parsing\ParserState;
 
 /**
@@ -20,7 +21,7 @@ public static function parse(ParserState $oParserState, bool $bIgnoreCase = fals
     {
         $oParserState->consume('(');
         $aArguments = parent::parseArguments($oParserState);
-        $mResult = new Expression("", $aArguments, ',', $oParserState->currentLine());
+        $mResult = new Expression('', $aArguments, ',', $oParserState->currentLine());
         $oParserState->consume(')');
         return $mResult;
     }

src/Value/Value.php

@@ -164,7 +164,7 @@ public static function parsePrimitiveValue(ParserState $parserState)
             $value = LineName::parse($parserState);
         } elseif ($parserState->comes('U+')) {
             $value = self::parseUnicodeRangeValue($parserState);
-        } elseif ($parserState->comes("(")) {
+        } elseif ($parserState->comes('(')) {
             $value = Expression::parse($parserState);
         } else {
             $nextCharacter = $parserState->peek(1);

tests/ParserTest.php

@@ -438,7 +438,7 @@ public function functionSyntax(): void
     /**
      * @test
      */
-    public function parseExpressions()
+    public function parseExpressions(): void
     {
         $oDoc = self::parsedStructureForFile('expressions');
         $sExpected = 'div {height: (vh - 10);}'
@@ -1194,7 +1194,7 @@ public function lonelyImport(): void
     /**
      * @test
      */
-    public function functionArithmeticInFile()
+    public function functionArithmeticInFile(): void
     {
         $oDoc = self::parsedStructureForFile('function-arithmetic', Settings::create()->withMultibyteSupport(true));
         $sExpected = 'div {height: max(300,vh + 10);}

tests/Unit/Value/ExpressionTest.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabberworm\CSS\Tests\Value;
 
 use PHPUnit\Framework\TestCase;
@@ -30,7 +32,7 @@ public static function provideExpressions(): array
             [
                 'input' => 'max(5, (vh - 10))',
                 'expected_output' => 'max(5,(vh - 10))',
-                'expression_index' => 1
+                'expression_index' => 1,
             ],
         ];
     }
@@ -54,7 +56,7 @@ public function parseExpressions(string $input, string $expected, int $expressio
 
     private function getDelimiters(string $rule): array
     {
-        $closure = function($rule) {
+        $closure = function ($rule) {
             return self::listDelimiterForRule($rule);
         };