Not using fixtures for specific unit tests under Rails 4.2 - ruby-on-rails

Question

I have a few tests in my suite that absolutely need an empty database to run.
Thing is, rails is automatically loading the fixtures for every test, and I can't seem to find a way to have it not load for this specific test.
I could drop the database before each test, but that's slow and requires all other tests that require fixtures to reload the fixtures afterwards.
Is there any way to have a certain test class (i.e. "NoFixturesTest") not load the fixtures (or unload them), without breaking all other tests?
Thanks!
EDIT:
Thanks to the answer below, I made this:
module DisableFixturesHelper
def self.included(base)
base.setup :setup_drop_db
# Have a unit test double-check that the fixtures are really gone
base.test "0 fixtures not loaded" do
assert_equal 0, Table1.count, "Table1 isn't empty!"
#etc
end
end
# Call to reset the db and therefore disable fixtures during a single unit test
def setup_drop_db
Rails.logger.info { "Dropping database." }
DatabaseCleaner.clean_with :truncation
end
end
And then in the TestCases that require an empty database (no fixtures), I add
include DisableFixturesHelper
The problem with this is that this drops the database once per test, AFTER the fixtures have already been loaded, so it's really slow. It's literally reloading the fixtures before the start of each unit test, just to drop them.
Still, it works.

Answer 1

do you know DatabaseCleaner ???
maybe it can help, you can also define what don't delete
something like:
DatabaseCleaner.strategy = :truncation, {:except => %w[widgets]}
here is an initializer that I always use:
RSpec.configure do |config|
config.before(:suite) do
DatabaseCleaner.clean_with(:truncation)
end
config.before(:each) do
DatabaseCleaner.strategy = :transaction
end
config.before(:each, :js => true) do
DatabaseCleaner.strategy = :truncation
end
config.before(:each) do
DatabaseCleaner.start
end
config.append_after(:each) do
DatabaseCleaner.clean
end
end