Add tests [MAILPOET-3157]

tests/integration/Config/RendererFactoryTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace MailPoet\Config;
+
+use MailPoet\WP\Functions as WPFunctions;
+
+class RendererFactoryTest extends \MailPoetTest {
+  public function testItCanEnableAndDisableCachingWithAFilter() {
+    $rendererFactory = new RendererFactory();
+    WPFunctions::get()->addFilter('mailpoet_template_cache_enabled', function () {
+      return true;
+    });
+    $renderer = $rendererFactory->getRenderer();
+    $result = $renderer->detectCache();
+    expect($result)->notEmpty();
+
+    $rendererFactory = new RendererFactory();
+    WPFunctions::get()->addFilter('mailpoet_template_cache_enabled', function () {
+      return false;
+    });
+    $renderer = $rendererFactory->getRenderer();
+    $result = $renderer->detectCache();
+    expect($result)->equals(false);
+  }
+}