Fix #419: Add test for fsPromises.open() when the path does not exist (#455)

* Fix #419: Add test for fsPromises.open() when the path does not exist

* Update package.json

* Fix #419: Add test for fsPromises.open() when the path does not exist

Removed some unnecessary code based on reviews

* Update fs.open.spec.js

tests/spec/fs.open.spec.js

@@ -137,3 +137,22 @@ describe('fs.open', function() {
     });
   });
 });
+
+/**
+ * fsPromise.open() Tests
+ **/
+describe('fsPromises.open', function() {
+  beforeEach(util.setup);
+  afterEach(util.cleanup);
+
+  it('should return an error if the parent path does not exist', function() {
+    var fsPromises = util.fs().promises;
+
+    return fsPromises.open('/tmp/myfile', 'w+')
+      .then(result => expect(result).not.to.exist)
+      .catch(error => {
+        expect(error).to.exist;
+        expect(error.code).to.equal('ENOENT');
+      });
+  });
+});