[TASK] Implement getArrayRepresentation() for Size (#1452)

Part of #1440.

Author: JakeQZ

src/Value/Size.php

@@ -8,6 +8,7 @@
 use Sabberworm\CSS\Parsing\ParserState;
 use Sabberworm\CSS\Parsing\UnexpectedEOFException;
 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+use Sabberworm\CSS\ShortClassNameProvider;
 
 use function Safe\preg_match;
 use function Safe\preg_replace;
@@ -17,6 +18,8 @@
  */
 class Size extends PrimitiveValue
 {
+    use ShortClassNameProvider;
+
     /**
      * vh/vw/vm(ax)/vmin/rem are absolute insofar as they don’t scale to the immediate parent (only the viewport)
      */
@@ -202,4 +205,19 @@ public function render(OutputFormat $outputFormat): string
 
         return preg_replace(["/$decimalPoint/", '/^(-?)0\\./'], ['.', '$1.'], $size) . ($this->unit ?? '');
     }
+
+    /**
+     * @return array<string, bool|int|float|string|list<array<string, mixed>>>
+     *
+     * @internal
+     */
+    public function getArrayRepresentation(): array
+    {
+        return [
+            'class' => $this->getShortClassName(),
+            // 'number' is the official W3C terminology (not 'size')
+            'number' => $this->size,
+            'unit' => $this->unit,
+        ];
+    }
 }

tests/Unit/Value/SizeTest.php

@@ -102,12 +102,39 @@ public function parsesUnit(string $unit): void
     /**
      * @test
      */
-    public function getArrayRepresentationThrowsException(): void
+    public function getArrayRepresentationIncludesClassName(): void
     {
-        $this->expectException(\BadMethodCallException::class);
+        $subject = new Size(1);
+
+        $result = $subject->getArrayRepresentation();
 
+        self::assertArrayHasKey('class', $result);
+        self::assertSame('Size', $result['class']);
+    }
+
+    /**
+     * @test
+     */
+    public function getArrayRepresentationIncludesNumber(): void
+    {
         $subject = new Size(1);
 
-        $subject->getArrayRepresentation();
+        $result = $subject->getArrayRepresentation();
+
+        self::assertArrayHasKey('number', $result);
+        self::assertSame(1.0, $result['number']);
+    }
+
+    /**
+     * @test
+     */
+    public function getArrayRepresentationIncludesUnit(): void
+    {
+        $subject = new Size(1, 'px');
+
+        $result = $subject->getArrayRepresentation();
+
+        self::assertArrayHasKey('unit', $result);
+        self::assertSame('px', $result['unit']);
     }
 }