Merge pull request #1372 from apiaryio/1371-transaction-log-order

fix: uses explicit validation result sections list for logging output

lib/TransactionRunner.js

@@ -573,15 +573,18 @@ include a message body: https://tools.ietf.org/html/rfc7231#section-6.3\
         let message = '';
         const object = gavelResult || {};
         let validatorOutput;
-        for (const sectionName of Object.keys(object || {})) {
-          // Section names are 'statusCode', 'headers', 'body' (and 'version', which is irrelevant)
+
+        // Order-sensitive list of validation sections to output in the log
+        const resultSections = ['headers', 'body', 'statusCode']
+          .filter(sectionName => Object.prototype.hasOwnProperty.call(object, sectionName));
+
+        resultSections.forEach((sectionName) => {
           validatorOutput = object[sectionName];
-          if (sectionName !== 'version') {
-            for (const gavelError of validatorOutput.results || []) {
-              message += `${sectionName}: ${gavelError.message}\n`;
-            }
-          }
-        }
+          (validatorOutput.results || []).forEach((gavelError) => {
+            message += `${sectionName}: ${gavelError.message}\n`;
+          });
+        });
+
         test.message = message;
 
         // Record raw validation output to transaction results object