customer_tests.rb

def setup
  FactoryGirl.create :customer, nickname: 'foo'
  FactoryGirl.create :customer, nickname: 'bar'
  FactoryGirl.create :customer, nickname: 'baz'
  FactoryGirl.create :customer, nickname: 'foofoo'
  FactoryGirl.create :customer, nickname: 'barBaz'
end

context "exists_by_nickname" do
  should "be true sometimes" do
    assert Customer.exists_by_nickname('foo')
    assert Customer.exists_by_nickname('foofoo')
    assert Customer.exists_by_nickname('baz')
  end

  should "be false sometimes" do
    assert_not Customer.exists_by_nickname('foe')
    assert_not Customer.exists_by_nickname('foof')
    assert_not Customer.exists_by_nickname('fool')
  end

  should "be case insensitive" do
    assert Customer.exists_by_nickname('barbaz')
    assert Customer.exists_by_nickname('bARBaz')
    assert Customer.exists_by_nickname('BaZ')
  end
end