MAGETWO-97247: Impossible to enable shared catalog through cli command

Author: dhorytskyi

app/code/Magento/Config/Model/Config/Backend/Currency/AbstractCurrency.php

@@ -14,6 +14,8 @@
 namespace Magento\Config\Model\Config\Backend\Currency;
 
 /**
+ * Base currency class
+ *
  * @api
  * @since 100.0.2
  */
@@ -26,18 +28,19 @@ abstract class AbstractCurrency extends \Magento\Framework\App\Config\Value
      */
     protected function _getAllowedCurrencies()
     {
-        if (!$this->isFormData() || $this->getData('groups/options/fields/allow/inherit')) {
-            return explode(
+        $allowValue = $this->getData('groups/options/fields/allow/value');
+        $allowedCurrencies = $allowValue === null || $this->getData('groups/options/fields/allow/inherit')
+            ? explode(
                 ',',
                 (string)$this->_config->getValue(
                     \Magento\Directory\Model\Currency::XML_PATH_CURRENCY_ALLOW,
                     $this->getScope(),
                     $this->getScopeId()
                 )
-            );
-        }
+            )
+            : (array) $allowValue;
 
-        return (array)$this->getData('groups/options/fields/allow/value');
+        return $allowedCurrencies;
     }
 
     /**

dev/tests/integration/testsuite/Magento/Config/Console/Command/ConfigSetCommandTest.php

@@ -28,7 +28,7 @@
 /**
  * Tests the different flows of config:set command.
  *
- * {@inheritdoc}
+ * @inheritdoc
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  * @magentoDbIsolation enabled
  */
@@ -292,8 +292,7 @@ public function runExtendedDataProvider()
      * @param string $scope
      * @param $scopeCode string|null
      * @dataProvider configSetValidationErrorDataProvider
-     *
-     * @magentoDbIsolation enabled
+     * @magentoDbIsolation disabled
      */
     public function testConfigSetValidationError(
         $path,
@@ -307,6 +306,7 @@ public function testConfigSetValidationError(
 
     /**
      * Data provider for testConfigSetValidationError
+     *
      * @return array
      */
     public function configSetValidationErrorDataProvider()
@@ -399,7 +399,6 @@ public function testConfigSetCurrency()
      * Saving values with successful validation
      *
      * @dataProvider configSetValidDataProvider
-     *
      * @magentoDbIsolation enabled
      */
     public function testConfigSetValid()