Issue 427 - Add tests to fsPromises.rmdir when directory doesn't exist and when trying to delete root directory (#457)

* Fix #427 - Fixed indentation and ENOENT -> EBUSY on line 120

* Deleted extra line at the end of document

* Fix #427 - Added tests for fsPromises.rmdir when trying to remove a nonexistent directory and when trying to remove root directory

tests/spec/fs.rmdir.spec.js

@@ -97,4 +97,27 @@ describe('fs.rmdir', function() {
       });
     });
   });
+
+  it('(promise) should be a function', function() {
+    var fsPromises = util.fs().promises;
+    expect(fsPromises.rmdir).to.be.a('function');
+  });
+  
+  it('(promise) should return an error if the path does not exist', function() {
+    var fsPromises = util.fs().promises;
+    return fsPromises.rmdir('/tmp/mydir')
+      .catch(error => {
+        expect(error).to.exist;
+        expect(error.code).to.equal('ENOENT');
+      });
+  });
+
+  it('(promise) should return an error if attempting to remove the root directory', function() {
+    var fsPromises = util.fs().promises;
+    return fsPromises.rmdir('/')
+      .catch(error => {
+        expect(error).to.exist;
+        expect(error.code).to.equal('EBUSY');
+      });
+  });
 });