MAGETWO-64226: Add paths validation

Author: shiftedreality

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

@@ -510,7 +510,9 @@ function (Mock $output) {
                 function (Mock $output) {
                     $output->expects($this->once())
                         ->method('writeln')
-                        ->with('<error>Invalid Base URL. Value must be a URL or one of placeholders: {{base_url}}</error>');
+                        ->with(
+                            '<error>Invalid Base URL. Value must be a URL or one of placeholders: {{base_url}}</error>'
+                        );
                 },
                 'web/unsecure/base_url',
                 'value',