11882: It's not possible to enable "log to file" (debugging) in production mode. Psr logger debug method does not work by the default in developer mode.

Author: nmalevanec

dev/tests/functional/tests/app/Magento/Backend/Test/Block/System/Config/Form.php

@@ -60,17 +60,7 @@ class Form extends Block
      */
     public function getGroup($tabName, $groupName)
     {
-        $this->baseUrl = $this->getBrowserUrl();
-        if (substr($this->baseUrl, -1) !== '/') {
-            $this->baseUrl = $this->baseUrl . '/';
-        }
-
-        $tabUrl = $this->getTabUrl($tabName);
-
-        if ($this->getBrowserUrl() !== $tabUrl) {
-            $this->browser->open($tabUrl);
-        }
-        $this->waitForElementNotVisible($this->tabReadiness);
+        $this->openTab($tabName);
 
         $groupElement = $this->_rootElement->find(
             sprintf($this->groupBlock, $tabName, $groupName),
@@ -95,6 +85,24 @@ public function getGroup($tabName, $groupName)
         return $blockFactory->getMagentoBackendSystemConfigFormGroup($groupElement);
     }
 
+    /**
+     * Check whether specified group presented on page.
+     *
+     * @param string $tabName
+     * @param string $groupName
+     *
+     * @return bool
+     */
+    public function isGroupVisible(string $tabName, string $groupName)
+    {
+        $this->openTab($tabName);
+
+        return $this->_rootElement->find(
+            sprintf($this->groupBlockLink, $tabName, $groupName),
+            Locator::SELECTOR_CSS
+        )->isVisible();
+    }
+
     /**
      * Retrieve url associated with the form.
      */
@@ -137,4 +145,24 @@ private function getTabUrl($tabName)
 
         return $tabUrl;
     }
+
+    /**
+     * Open specified tab.
+     *
+     * @param string $tabName
+     * @return void
+     */
+    private function openTab(string $tabName)
+    {
+        $this->baseUrl = $this->getBrowserUrl();
+        if (substr($this->baseUrl, -1) !== '/') {
+            $this->baseUrl = $this->baseUrl . '/';
+        }
+        $tabUrl = $this->getTabUrl($tabName);
+
+        if ($this->getBrowserUrl() !== $tabUrl) {
+            $this->browser->open($tabUrl);
+        }
+        $this->waitForElementNotVisible($this->tabReadiness);
+    }
 }

dev/tests/functional/tests/app/Magento/Backend/Test/Constraint/AssertDeveloperSectionVisibility.php

@@ -9,27 +9,56 @@
 use Magento\Backend\Test\Page\Adminhtml\SystemConfigEdit;
 
 /**
- * Assert that Developer section is not present in production mode.
+ * Assert that all groups in Developer section is not present in production mode except debug group "Log to File" field.
  */
 class AssertDeveloperSectionVisibility extends AbstractConstraint
 {
     /**
-     * Assert Developer section is not present in production mode.
+     * List of groups not visible in production mode.
+     *
+     * @var array
+     */
+    private $groups = [
+        'front_end_development_workflow',
+        'restrict',
+        'template',
+        'translate_inline',
+        'js',
+        'css',
+        'image',
+        'static',
+        'grid',
+    ];
+
+    /**
+     * Assert all groups in Developer section is not present in production mode except debug group "Log to File" field.
      *
      * @param SystemConfigEdit $configEdit
      * @return void
      */
     public function processAssert(SystemConfigEdit $configEdit)
     {
         if ($_ENV['mage_mode'] === 'production') {
-            \PHPUnit_Framework_Assert::assertFalse(
-                in_array('Developer', $configEdit->getTabs()->getSubTabsNames('Advanced')),
-                'Developer section should be hidden in production mode.'
+            foreach ($this->groups as $group) {
+                \PHPUnit_Framework_Assert::assertFalse(
+                    $configEdit->getForm()->isGroupVisible('dev', $group),
+                    sprintf('%s group should be hidden in production mode.', $group)
+                );
+            }
+            \PHPUnit_Framework_Assert::assertTrue(
+                $configEdit->getForm()->getGroup('dev', 'debug')->isFieldVisible('dev', 'debug_debug', 'logging'),
+                '"Log to File" should be presented in production mode.'
             );
         } else {
+            foreach ($this->groups as $group) {
+                \PHPUnit_Framework_Assert::assertTrue(
+                    $configEdit->getForm()->isGroupVisible('dev', $group),
+                    sprintf('%s group should be visible in developer mode.', $group)
+                );
+            }
             \PHPUnit_Framework_Assert::assertTrue(
-                in_array('Developer', $configEdit->getTabs()->getSubTabsNames('Advanced')),
-                'Developer section should be not hidden in developer or default mode.'
+                $configEdit->getForm()->isGroupVisible('dev', 'debug'),
+                'Debug group should be visible in developer mode.'
             );
         }
     }