```ruby
# encoding: UTF-8
require 'uglifier'
require 'rspec'
require 'source_map'

# Requires supporting files with custom matchers and macros, etc,
# in ./support/ and its subdirectories.
Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each {|f| require f}

RSpec.configure do |config|
  
end
```

Enforce use of expect syntax
user
```ruby
# encoding: UTF-8
require 'uglifier'
require 'rspec'
require 'source_map'

# Requires supporting files with custom matchers and macros, etc,
# in ./support/ and its subdirectories.
Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each {|f| require f}

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