```ruby
# encoding: utf-8

require 'devtools'

Devtools.init_spec_helper

if ENV['COVERAGE'] == 'true'
  require 'simplecov'

  SimpleCov.start do
    command_name     'spec:unit'
    add_filter       'config'
    add_filter       'spec'
    minimum_coverage 100
  end
end

require 'axiom-types'

include Axiom::Types

# require spec support files and shared behavior
Dir[File.expand_path('../{support,shared}/**/*.rb', __FILE__)].each do |file|
  require file
end

RSpec.configure do |config|
end
```

Change specs to use RSpec 3 expect syntax
user
```ruby
# encoding: utf-8

require 'devtools'

Devtools.init_spec_helper

if ENV['COVERAGE'] == 'true'
  require 'simplecov'

  SimpleCov.start do
    command_name     'spec:unit'
    add_filter       'config'
    add_filter       'spec'
    minimum_coverage 100
  end
end

require 'axiom-types'

include Axiom::Types

# require spec support files and shared behavior
Dir[File.expand_path('../{support,shared}/**/*.rb', __FILE__)].each do |file|
  require file
end

RSpec.configure do |config|
  config.expect_with :rspec do |expect_with|
    expect_with.syntax = :expect
  end
end
```
assistant