diff --git a/tests/Model/MetadataTest.php b/tests/Model/MetadataTest.php
new file mode 100644
index 0000000..f9a3b34
--- /dev/null
+++ b/tests/Model/MetadataTest.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pcm\MetadataBundle\Tests\Model;
+
+use Pcm\MetadataBundle\Exception\MissingKeyException;
+use Pcm\MetadataBundle\Model\Metadata;
+use PHPUnit\Framework\TestCase;
+
+final class MetadataTest extends TestCase
+{
+    private Metadata $metadata;
+
+    protected function setUp(): void
+    {
+        $array = []; // Needs to be a var as it's passed by reference
+        $this->metadata = new Metadata($array);
+    }
+
+    public function testGetReturnsSetValue(): void
+    {
+        $value = 'brad woz ere';
+        $this->metadata->set('key', $value);
+        $result = $this->metadata->get('key');
+        $this->assertSame($value, $result);
+    }
+
+    public function testGetThrowsWhenKeyNotSet(): void
+    {
+        $this->expectException(MissingKeyException::class);
+        $this->metadata->get('missing');
+    }
+
+    public function testValueIsOverwritten(): void
+    {
+        $key = 'key';
+        $valueA = 'meta';
+        $valueB = 'data';
+
+        $this->metadata->set($key, $valueA);
+        $result = $this->metadata->get($key);
+        $this->assertSame($valueA, $result);
+
+        $this->metadata->set($key, $valueB);
+        $result = $this->metadata->get($key);
+        $this->assertSame($valueB, $result);
+    }
+
+    public function testHasReturnsTrueWhenKeyIsSet(): void
+    {
+        $key = 'null';
+        $this->metadata->set($key, null);
+        $result = $this->metadata->has($key);
+        $this->assertTrue($result);
+    }
+
+    public function testHasReturnsFalseWhenKeyIsNotSet(): void
+    {
+        $result = $this->metadata->has('missing');
+        $this->assertFalse($result);
+    }
+}
+