MAGETWO-88264: [Forwardport] Remove forced setting of cache_lifetime to false in constructor and set default cache_lifetime to 3600 #13785

 - Merge Pull Request #13785 from nmalevanec/magento2:2.3-develop-PR-port-13762
 - Merged commits:
   1. 53c7321
   2. 2407845

Author: magento-engcom-team

app/code/Magento/Theme/Block/Html/Footer.php

@@ -57,7 +57,6 @@ protected function _construct()
     {
         $this->addData(
             [
-                'cache_lifetime' => false,
                 'cache_tags' => [\Magento\Store\Model\Store::CACHE_TAG, \Magento\Cms\Model\Block::CACHE_TAG],
             ]
         );
@@ -123,4 +122,14 @@ public function getIdentities()
     {
         return [\Magento\Store\Model\Store::CACHE_TAG, \Magento\Cms\Model\Block::CACHE_TAG];
     }
+
+    /**
+     * Get block cache life time
+     *
+     * @return int
+     */
+    protected function getCacheLifetime()
+    {
+        return parent::getCacheLifetime() ?: 3600;
+    }
 }

app/code/Magento/Theme/Test/Unit/Block/Html/FooterTest.php

@@ -30,4 +30,18 @@ public function testGetIdentities()
             $this->block->getIdentities()
         );
     }
+
+    /**
+     * Check Footer block has cache lifetime.
+     *
+     * @throws \ReflectionException
+     * @return void
+     */
+    public function testGetCacheLifetime()
+    {
+        $reflection = new \ReflectionClass($this->block);
+        $method = $reflection->getMethod('getCacheLifetime');
+        $method->setAccessible(true);
+        $this->assertEquals(3600, $method->invoke($this->block));
+    }
 }