Add basic Collection class with add method

.gitignore

@@ -1,3 +1,4 @@
 /.idea
 /vendor
-composer.lock
+composer.lock
+.phpunit.result.cache

composer.json

@@ -2,12 +2,12 @@
     "name": "loomlabs/utility.collection",
     "autoload": {
         "psr-4": {
-            "LoomLabs\\Utility\\Collection\\": "src/"
+            "Loom\\Utility\\Collection\\": "src/"
         }
     },
     "autoload-dev": {
         "psr-4": {
-            "LoomLabs\\Utility\\Collection\\Tests\\": "tests/"
+            "Loom\\Utility\\Collection\\Tests\\": "tests/"
         }
     },
     "version": "1.0.0",

phpunit.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit colors="true"
+         bootstrap="vendor/autoload.php"
+         displayDetailsOnIncompleteTests="true"
+         displayDetailsOnSkippedTests="true"
+         displayDetailsOnTestsThatTriggerDeprecations="true"
+         displayDetailsOnTestsThatTriggerWarnings="true"
+         displayDetailsOnTestsThatTriggerNotices="true"
+         failOnWarning="true"
+         failOnRisky="true">
+    <testsuites>
+        <testsuite name="Unit Tests">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <coverage/>
+    <source>
+        <include>
+            <directory suffix=".php">src/</directory>
+        </include>
+    </source>
+</phpunit>

src/AbstractCollection.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Loom\Utility\Collection;
+
+use Loom\Utility\Collection\Interface\CollectionInterface;
+
+class AbstractCollection implements CollectionInterface
+{
+    public function __construct(protected array $items = [])
+    {
+    }
+
+    public function add(mixed $item): void
+    {
+        $this->items[] = $item;
+    }
+
+    public function toArray(): array
+    {
+        return $this->items;
+    }
+}

src/Collection.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Loom\Utility\Collection;
+
+class Collection extends AbstractCollection implements \IteratorAggregate, \Countable
+{
+    public function getIterator(): \Traversable
+    {
+        return new \ArrayIterator($this->items);
+    }
+
+    public function count(): int
+    {
+        return count($this->items);
+    }
+}

src/Interface/CollectionInterface.php

@@ -0,0 +1,10 @@
+<?php
+declare(strict_types=1);
+
+namespace Loom\Utility\Collection\Interface;
+
+interface CollectionInterface
+{
+    public function add(mixed $item): void;
+    public function toArray(): array;
+}

tests/CollectionTest.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Loom\Utility\Collection\Tests;
+
+use Loom\Utility\Collection\Collection;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+class CollectionTest extends TestCase
+{
+    #[DataProvider('addDataProvider')]
+    public function testAdd(array $startingItems, mixed $itemToAdd, array $expectedResult): void
+    {
+        $collection = new Collection($startingItems);
+        $collection->add($itemToAdd);
+
+        $this->assertEquals($expectedResult, $collection->toArray());
+    }
+
+    public static function addDataProvider(): array
+    {
+        return [
+            [
+                'startingItems' => ['apple', 'banana', 'cherry'],
+                'itemToAdd' => 'grape',
+                'expectedResult' => ['apple', 'banana', 'cherry', 'grape'],
+            ],
+            [
+                'startingItems' => [],
+                'itemToAdd' => 1,
+                'expectedResult' => [1],
+            ],
+
+        ];
+    }
+}