Failure in Fixtures

1) Failure:
UserTest#test_a_user_should_have_a_unique_profile_name [test/models/user_test.rb:31]:
Failed assertion, no message given.

require 'test_helper'

class UserTest < ActiveSupport::TestCase
  test "a user should enter a first name" do
    user = User.new
    assert !user.save
    assert !user.errors[:first_name].empty?
  end

  test "a user should enter a last name" do
    user = User.new
    assert !user.save
    assert !user.errors[:last_name].empty?
  end

  test "a user should enter a profile name" do
    user = User.new
    assert !user.save
    assert !user.errors[:profile_name]. empty?
  end

  test "a user should have a unique profile name" do
    user = User.new
    user.profile_name = 'jason'
    user.email = "jseifer@teamtreehouse.com"
    user.first_name = "Jason"
    user.last_name = "Seifer"
    user.password = "12345678"
    user.password_confirmation = "12345678"

    assert !user.save
    assert !user.errors[:profile_name].empty?
  end
end