You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: definition_builder_test.rb
    path of file: ./repos/rbs/test/rbs
    
    the code of the file until where you have to start completion: require "test_helper"

class RBS::DefinitionBuilderTest < Test::Unit::TestCase
  include TestHelper

  AST = RBS::AST
  Environment = RBS::Environment
  EnvironmentLoa
    
  def test_build_instance_variables
    SignatureManager.new do |manager|
      manager.files[Pathname("foo.rbs")] = <<EOF
class Hello[A]
  @name: A
  @@email: String
end

class Foo < Hello[String]
end