tests: added cache trait tests

src/Resource/Util/CacheTrait.php

@@ -8,7 +8,7 @@ trait CacheTrait
 {
     public function withCacheTtl(?int $ttl): static
     {
-        $clone = deep_copy($this);
+        $clone = deep_copy($this, true);
         $clone->api->getCacheBuilder()?->setTtl($ttl);
 
         return $clone;

src/Resource/Util/LanguageTrait.php

@@ -16,7 +16,7 @@ public function withLanguage(string $language): static
     {
         $this->validateLanguage($language);
 
-        $clone = deep_copy($this);
+        $clone = deep_copy($this, true);
         $clone->api->addQueryDefault('lang', $language);
 
         return $clone;

src/Resource/Util/UnitSystemTrait.php

@@ -16,7 +16,7 @@ public function withUnitSystem(string $unitSystem): static
     {
         $this->validateUnitSystem($unitSystem);
 
-        $clone = deep_copy($this);
+        $clone = deep_copy($this, true);
         $clone->api->addQueryDefault('units', $unitSystem);
 
         return $clone;

tests/Integration/CacheTraitTest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace ProgrammatorDev\OpenWeatherMap\Test\Integration;
+
+use ProgrammatorDev\Api\Builder\CacheBuilder;
+use ProgrammatorDev\OpenWeatherMap\Resource\Resource;
+use ProgrammatorDev\OpenWeatherMap\Resource\Util\CacheTrait;
+use ProgrammatorDev\OpenWeatherMap\Test\AbstractTest;
+use Psr\Cache\CacheItemPoolInterface;
+
+class CacheTraitTest extends AbstractTest
+{
+    private Resource $resource;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $pool = $this->createMock(CacheItemPoolInterface::class);
+        $cacheBuilder = new CacheBuilder($pool);
+
+        $this->api->setCacheBuilder($cacheBuilder);
+
+        $this->resource = new class($this->api) extends Resource {
+            use CacheTrait;
+
+            public function getCacheTtl(): ?int
+            {
+                return $this->api->getCacheBuilder()?->getTtl();
+            }
+        };
+    }
+
+    public function testMethods(): void
+    {
+        $this->assertSame(600, $this->resource->withCacheTtl(600)->getCacheTtl());
+        $this->assertSame(60, $this->resource->getCacheTtl()); // back to default value
+    }
+}