Write some specs for settings cache repository

spec/Flarum/Core/Settings/CachedSettingsRepositorySpec.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace spec\Flarum\Core\Settings;
+
+use Flarum\Core\Settings\SettingsRepository;
+use PhpSpec\ObjectBehavior;
+use Prophecy\Argument;
+
+class CachedSettingsRepositorySpec extends ObjectBehavior
+{
+    function let(SettingsRepository $inner)
+    {
+        $this->beConstructedWith($inner);
+    }
+
+    function it_is_initializable()
+    {
+        $this->shouldHaveType('Flarum\Core\Settings\CachedSettingsRepository');
+    }
+
+    function it_retrieves_data_from_inner(SettingsRepository $inner)
+    {
+        $settings = ['a' => 1, 'b' => 2];
+        $inner->all()->willReturn($settings);
+        $inner->all()->shouldBeCalled();
+
+        // Test fetching all settings
+        $this->all()->shouldReturn($settings);
+
+        // Test fetching single settings
+        $this->get('a')->shouldReturn(1);
+        $this->get('b')->shouldReturn(2);
+
+        // Test invalid key
+        $this->get('c')->shouldReturn(null);
+
+        // Test invalid key with custom default
+        $this->get('d', 'foobar')->shouldReturn('foobar');
+    }
+
+    function it_passes_new_data_to_inner(SettingsRepository $inner)
+    {
+        $this->set('a', 1);
+        $inner->set('a', 1)->shouldHaveBeenCalled();
+    }
+
+    function it_caches_new_data(SettingsRepository $inner)
+    {
+        $this->set('b', 2);
+        $this->get('b')->shouldReturn(2);
+        $inner->all()->shouldNotHaveBeenCalled();
+        $inner->get('b')->shouldNotHaveBeenCalled();
+    }
+}