Resolve RSpec::Mocks::OutsideOfExampleError

[abicky]

This PR resolves RSpec::Mocks::OutsideOfExampleError when spec/async_producer_spec.rb is executed.

Before

% rspec spec/async_producer_spec.rb Run options: exclude {:functional=>true, :performance=>true, :fuzz=>true} Kafka::AsyncProducer #deliver_messages instruments the error after failing to deliver buffered messages #shutdown delivers buffered messages instruments a failure to deliver buffered messages #produce delivers buffered messages retries until configured max_retries requires `topic` to be a String Finished in 0.73698 seconds (files took 0.63537 seconds to load) 6 examples, 0 failures #<Thread:0x00007fc7ab171c70 /Users/arabiki/ghq/src/github.com/zendesk/ruby-kafka/lib/kafka/async_producer.rb:162 aborting> terminated with exception (report_on_exception is true): Traceback (most recent call last): 9: from /Users/arabiki/ghq/src/github.com/zendesk/ruby-kafka/lib/kafka/async_producer.rb:162:in `block (2 levels) in ensure_threads_running!' 8: from /Users/arabiki/ghq/src/github.com/zendesk/ruby-kafka/lib/kafka/async_producer.rb:253:in `run' 7: from /Users/arabiki/ghq/src/github.com/zendesk/ruby-kafka/lib/kafka/async_producer.rb:252:in `ensure in run' 6: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/method_double.rb:64:in `block (2 levels) in define_proxy_method' 5: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/method_double.rb:77:in `proxy_method_invoked' 4: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/proxy.rb:214:in `message_received' 3: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/test_double.rb:75:in `method_missing' 2: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/test_double.rb:112:in `__mock_proxy' 1: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/space.rb:11:in `proxy_for' /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/space.rb:51:in `raise_lifecycle_message': The use of doubles or partial doubles from rspec-mocks outside of the per-test lifecycle is not supported. (RSpec::Mocks::OutsideOfExampleError) #<Thread:0x00007fc7ab16a150 /Users/arabiki/ghq/src/github.com/zendesk/ruby-kafka/lib/kafka/async_producer.rb:162 aborting> terminated with exception (report_on_exception is true): Traceback (most recent call last): 9: from /Users/arabiki/ghq/src/github.com/zendesk/ruby-kafka/lib/kafka/async_producer.rb:162:in `block (2 levels) in ensure_threads_running!' 8: from /Users/arabiki/ghq/src/github.com/zendesk/ruby-kafka/lib/kafka/async_producer.rb:253:in `run' 7: from /Users/arabiki/ghq/src/github.com/zendesk/ruby-kafka/lib/kafka/async_producer.rb:252:in `ensure in run' 6: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/method_double.rb:64:in `block (2 levels) in define_proxy_method' 5: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/method_double.rb:77:in `proxy_method_invoked' 4: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/proxy.rb:214:in `message_received' 3: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/test_double.rb:75:in `method_missing' 2: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/test_double.rb:112:in `__mock_proxy' 1: from /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/space.rb:11:in `proxy_for' /Users/arabiki/.anyenv/envs/rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-mocks-3.9.1/lib/rspec/mocks/space.rb:51:in `raise_lifecycle_message': The use of doubles or partial doubles from rspec-mocks outside of the per-test lifecycle is not supported. (RSpec::Mocks::OutsideOfExampleError) 

After

% rspec spec/async_producer_spec.rb Run options: exclude {:functional=>true, :performance=>true, :fuzz=>true} Kafka::AsyncProducer #deliver_messages instruments the error after failing to deliver buffered messages #shutdown delivers buffered messages instruments a failure to deliver buffered messages #produce delivers buffered messages retries until configured max_retries requires `topic` to be a String Finished in 0.73808 seconds (files took 0.70865 seconds to load) 6 examples, 0 failures 

[dasch]

Thanks!