RSpec puts different from should equal value

Question

I cannot understand why the block of code below is not passing even though the puts value is showing the value I am checking for:

  let(:new_on_each_example) { MovieList.new }
  it "can use method defined by 'let'" do
    new_on_each_example.should_not be_nil
    # the object is memoized, so
    new_on_each_example.should == new_on_each_example

    puts new_on_each_example.class
    new_on_each_example.class.should == "MovieList"
  end

The console shows:

MovieList

expected: "MovieList" got: MovieList(id: integer, title: string, created_at: datetime, updated_at: datetime, track_number: integer) (using ==)

Puts displays the value that I'm looking for but the test fails. Why is this?

Answer 1

new_on_each_example.should be_instance_of(MovieList)

更多信息在rspec matchers doc中

Answer 2

You are passing to RSpec "MovieList" . It's a string, not the constant for your class. So you should do something like:

new_on_each_example.class.should == MovieList

but using RSpec you can do something more elegant too:

new_on_each_example.class.should be_a(MovieList)