feature #1413 [Twig] Make ComponentAttributes traversable/countable (kbond)

This PR was merged into the 2.x branch.

Discussion
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[Twig] Make `ComponentAttributes` traversable/countable

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Issues        | n/a
| License       | MIT

This will help with #1405 and #1414.

Commits
-------

8040d9c feat(twig): make `ComponentAttributes` traversable/countable

Author: weaverryan

src/TwigComponent/CHANGELOG.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## Unreleased
+
+-   Make `ComponentAttributes` traversable/countable.
+
 ## 2.13.0
 
 -   [BC BREAK] Add component metadata to `PreMountEvent` and `PostMountEvent`

src/TwigComponent/src/ComponentAttributes.php

@@ -19,7 +19,7 @@
  *
  * @immutable
  */
-final class ComponentAttributes
+final class ComponentAttributes implements \IteratorAggregate, \Countable
 {
     /**
      * @param array<string, string|bool> $attributes
@@ -157,4 +157,14 @@ public function remove($key): self
 
         return new self($attributes);
     }
+
+    public function getIterator(): \Traversable
+    {
+        return new \ArrayIterator($this->attributes);
+    }
+
+    public function count(): int
+    {
+        return \count($this->attributes);
+    }
 }

src/TwigComponent/tests/Unit/ComponentAttributesTest.php

@@ -191,4 +191,12 @@ public function testNullBehaviour(): void
         $this->assertSame(['disabled' => null], $attributes->all());
         $this->assertSame(' disabled', (string) $attributes);
     }
+
+    public function testIsTraversableAndCountable(): void
+    {
+        $attributes = new ComponentAttributes(['foo' => 'bar']);
+
+        $this->assertSame($attributes->all(), iterator_to_array($attributes));
+        $this->assertCount(1, $attributes);
+    }
 }