diff --git a/tests/Unit/KeyGenerators/HashKeyGeneratorTest.php b/tests/Unit/KeyGenerators/HashKeyGeneratorTest.php
new file mode 100644
index 0000000..cc68055
--- /dev/null
+++ b/tests/Unit/KeyGenerators/HashKeyGeneratorTest.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+use Rawilk\Settings\Support\Context;
+use Rawilk\Settings\Support\ContextSerializers\ContextSerializer;
+use Rawilk\Settings\Support\ContextSerializers\DotNotationContextSerializer;
+use Rawilk\Settings\Support\KeyGenerators\HashKeyGenerator;
+
+beforeEach(function () {
+    $this->keyGenerator = (new HashKeyGenerator)
+        ->setContextSerializer(new ContextSerializer);
+
+    config([
+        'settings.hash_algorithm' => 'xxh128',
+    ]);
+});
+
+it('generates a hash of a key', function () {
+    // N; is for a serialized null context object
+    expect($this->keyGenerator->generate('my-key'))->toBe(hash('xxh128', 'my-keyN;'));
+});
+
+it('generates a hash of a key and context object', function () {
+    $context = new Context([
+        'id' => 123,
+    ]);
+
+    expect($this->keyGenerator->generate('my-key', $context))
+        ->toBe(hash('xxh128', 'my-key' . serialize($context)));
+});
+
+it('works with other context serializers', function () {
+    $this->keyGenerator->setContextSerializer(new DotNotationContextSerializer);
+
+    $context = new Context([
+        'id' => 123,
+        'bool-value' => false,
+    ]);
+
+    expect($this->keyGenerator->generate('my-key', $context))
+        ->toBe(hash('xxh128', 'my-keyid:123::bool-value:0'));
+});