Fixed disabled VFS tests (#185)

Fixes VFS tests that were commented out due to assertion issues relating to null byte characters not visible in console output, hence not caught.

Author: ajmeese7

__tests__/utils/vfs.js

@@ -194,11 +194,10 @@ describe('utils.vfs#transformArrayBuffer', () => {
   const testAbString = ab2str(testAb);
   const create = type => vfs.transformArrayBuffer(testAb, 'text/plain', type);
 
-  /* FIXME
   test('Should create string', () =>
     create('string')
-      .then(result => expect(result).toBe('foo')));
-      */
+      .then(result => result.replace(/\0/g, ''))
+      .then(result => expect(result).toBe(testText)));
 
   test('Should create data url', async () => {
     const result = await create('uri');
@@ -210,12 +209,11 @@ describe('utils.vfs#transformArrayBuffer', () => {
     expect(index).not.toBe(-1);
   });
 
-  /* FIXME
   test('Should create blob', () =>
     create('blob')
       .then(blob2str)
+      .then(result => result.replace(/\0/g, ''))
       .then(result => expect(result).toBe(testText)));
-      */
 
   test('Should create arraybuffer (default)', () =>
     create('arraybuffer')