Decode base64-encoded Text Attachments (#308)

* introduce fix as described in PR 297

* fix test

---------

Co-authored-by: Max Schluer <mail@maximilian-schluer.com>

Author: mschluer

lib/generate-report.js

@@ -406,7 +406,17 @@ function generateReport(options) {
     scenario.steps.forEach((step) => {
       if (step.embeddings !== undefined) {
         step.attachments = [];
+	
         step.embeddings.forEach((embedding, embeddingIndex) => {
+	  /* Decode Base64 for Text-ish attachements */
+	  if(
+	    embedding.mime_type === 'application/json' ||
+	    embedding.mime_type === 'text/html' ||
+	    embedding.mime_type === 'text/plain'
+	  ) {
+	    embedding.data = Buffer.from(embedding.data.toString(), 'base64')
+	  }
+	
           /* istanbul ignore else */
           if (
             embedding.mime_type === 'application/json' ||