So on pg 23, I ran npm install to install dependencies successfully,

However when I ran make test... I get:

Makefile:2: *** missing separator. Stop.

I assume that that the code from Makefile should have a tab but not spaces.
However, I made certain that the second line begins with a tab

test:
@./node_modules/.bin/mocha -u tdd
.PHONY: test

What do you suppose I'm doing wrong?