Move integration tests into a separated directory and add script to run only integration tests

Author: blikblum

package.json

@@ -55,6 +55,7 @@
     "website": "node docs/generate_website.js",
     "docs": "npm run pdf-guide && npm run website && npm run browser-demo",
     "test": "jest -i",
+    "test:integration": "jest integration/ -i",
     "test:unit": "jest unit/ -i"
   },
   "main": "js/pdfkit.js",

tests/__snapshots__/fonts.spec.js.snap …gration/__snapshots__/fonts.spec.js.snaptests/__snapshots__/fonts.spec.js.snap renamed to tests/integration/__snapshots__/fonts.spec.js.snap tests/__snapshots__/fonts.spec.js.snap renamed to tests/integration/__snapshots__/fonts.spec.js.snap

@@ -1,5 +1,5 @@
-var PDFDocument = require('../lib/document').default;
-var PDFSecurity = require('../lib/security').default;
+var PDFDocument = require('../../lib/document').default;
+var PDFSecurity = require('../../lib/security').default;
 var CryptoJS = require('crypto-js');
 var path = require('path');
 var fs = require('fs');