instrumentation_errors.rb

require 'bundler/inline'

gemfile(true) do
  source 'https://rubygems.org'
  gem 'graphql', '1.9.12'
  gem 'rspec'
end

require 'rspec/autorun'

class TestAnalyzer < GraphQL::Analysis::AST::Analyzer
  def result
    raise "Gah! I'm a bug"
  end
end

module TestInstrumentation
  extend self

  def use(schema)
    schema.instrument(:query, self)
  end

  def before_query(_query)
    # not used
  end

  def after_query(query)
    # Uncomment the following to avoid infinite recursion
    # return unless query.instance_variable_get(:@executed)

    query_result = query.result
    query_result['extensions'] ||= {}
    query_result['extensions']['hello'] = 'world'
  end
end

class TestQueryType < GraphQL::Schema::Object
  field :ping, String, null: false

  def ping
    'ok'
  end
end

class TestSchema < GraphQL::Schema
  use GraphQL::Execution::Interpreter
  use GraphQL::Analysis::AST
  use TestInstrumentation
  query_analyzer TestAnalyzer
  query TestQueryType
end

describe do
  specify do
    query = <<~GRAPHQL
      query {
        ping
      }
    GRAPHQL

    expect { TestSchema.execute(query) }.to raise_error("Gah! I'm a bug")
  end
end