Why is this simple minitest failing?

I'm new to testing rails applications as as usually just do manual testing... but I'm trying to do it the right way this time.

Why is this basic test failing?

   test "once you go to to app you are asked to sign in" do
        get "/"
        assert_redirected_to "/users/sign_in"
        assert_select "title", "Home Sign-In"
      end

The first assertion is successful but not the second. The title seems correct when I view source.

<title>Home Sign-In</title>