[misc] test/unit: add missing globals that are lazy loaded

services/filestore/test/unit/js/S3PersistorTests.js

@@ -158,7 +158,7 @@ describe('S3PersistorTests', function() {
         'metrics-sharelatex': Metrics,
         crypto
       },
-      globals: { console }
+      globals: { console, Buffer }
     })
   })
 

services/filestore/test/unit/js/SafeExecTests.js

@@ -12,6 +12,7 @@ describe('SafeExec', function() {
     options = { timeout: 10 * 1000, killSignal: 'SIGTERM' }
 
     safeExec = SandboxedModule.require(modulePath, {
+      globals: { process },
       requires: {
         'settings-sharelatex': settings
       }