Module: Deimos::TestHelpers

Extended by:
ActiveSupport::Concern
Defined in:
lib/deimos/test_helpers.rb

Overview

Include this module in your RSpec spec_helper to stub out external dependencies and add methods to use to test encoding/decoding.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/deimos/test_helpers.rb', line 16

def self.included(base)
  super
  base.include Karafka::Testing::RSpec::Helpers

  # Ensure that we only use Karafka.producer, not the producers we set up for multi-broker
  # configs. Only Karafka.producer works with Karafka test helpers.
  RSpec.configure do |config|
    config.before(:each) do
      allow(Deimos).to receive(:producer_for).and_return(Karafka.producer)
    end
  end
end

.normalize_message(message) ⇒ Object 



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# File 'lib/deimos/test_helpers.rb', line 73

def self.normalize_message(message)
  return nil if message.nil?

  if message.respond_to?(:to_h)
    message = message.to_h
  end
  if message.respond_to?(:with_indifferent_access)
    message = message.with_indifferent_access
  end
  message
end

.sent_messages ⇒ Array<Hash>

Returns:

  • (Array<Hash>) 


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# File 'lib/deimos/test_helpers.rb', line 36

def sent_messages
  Karafka.producer.client.messages.map do |m|
    produced_message = m.except(:label).deep_dup
    Deimos.decode_message(produced_message)
    produced_message[:payload] = Deimos::TestHelpers.normalize_message(produced_message[:payload])
    produced_message[:key] = Deimos::TestHelpers.normalize_message(produced_message[:key])
    produced_message
  end
end

.unit_test! ⇒ void

This method returns an undefined value.

Set the config to the right settings for a unit test



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# File 'lib/deimos/test_helpers.rb', line 48

def unit_test!
  Deimos.config.schema.backend = :avro_validation
  warn("unit_test! is deprecated and can be replaced by setting Deimos's schema backend " \
       'to `:avro_validation`. All other test behavior is provided by Karafka.')
end

Instance Method Details

#clear_kafka_messages! ⇒ void

This method returns an undefined value.

Clear all sent messages - e.g. if we want to check that particular messages were sent or not sent after a point in time.



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# File 'lib/deimos/test_helpers.rb', line 143

def clear_kafka_messages!
  puts '[Deprecated] clear_kafka_messages! can be replaced with' \
       '`karafka.produced_messages.clear`'
  karafka.produced_messages.clear
end

#sent_messages ⇒ Array<Hash>

Returns:

  • (Array<Hash>) 


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# File 'lib/deimos/test_helpers.rb', line 30

def sent_messages
  self.class.sent_messages
end

#test_consume_batch(handler_class_or_topic, payloads, keys: [], call_original: nil, single: false, partition_keys: []) ⇒ void

This method returns an undefined value.

Test that a given handler will consume a given batch payload correctly, i.e. that the schema is correct. If a block is given, that block will be executed when consume is called. Otherwise it will just confirm that consume is called at all. Deimos::Consumer or the topic as a string

Parameters:

  • handler_class_or_topic (Class, String) —

    Class which inherits from

  • payloads (Array<Hash>) —

    the payload to consume

  • call_original (Boolean, nil) (defaults to: nil) —

    legacy parameter.

  • keys (Array<Object>) (defaults to: [])
  • partition_keys (Array<Object>) (defaults to: [])
  • single (Boolean) (defaults to: false) —

    used internally.



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# File 'lib/deimos/test_helpers.rb', line 190

def test_consume_batch(handler_class_or_topic,
                       payloads,
                       keys: [],
                       call_original: nil,
                       single: false,
                       partition_keys: [])
  unless call_original.nil?
    puts 'test_consume_batch(call_original: true) is deprecated and will be removed' \
         'in the future. You can remove the call_original parameter.'
  end
  karafka.consumer_messages.clear
  topic_name = if handler_class_or_topic.is_a?(String)
    handler_class_or_topic
               else
    Deimos.topic_for_consumer(handler_class_or_topic)
  end
  consumer = karafka.consumer_for(topic_name)

  Deimos.karafka_config_for(topic: topic_name).each_message(single)

  # don't record messages sent with test_consume_batch
  original_messages = karafka.produced_messages.dup
  payloads.each_with_index do |payload, i|
   karafka.produce(payload, { key: keys[i], partition_key: partition_keys[i], topic: consumer.topic.name })
  end
  if block_given?
    if single
      allow(consumer).to receive(:consume_message) do
       yield(consumer.messages.first.payload, consumer.messages.first.as_json['metadata'])
      end
    else
      allow(consumer).to receive(:consume_batch) do
       yield(consumer.messages)
      end
    end
  end

  # sent_messages should only include messages sent by application code, not this method
  karafka.produced_messages.clear
  karafka.produced_messages.concat(original_messages)

  consumer.consume
end

#test_consume_message(handler_class_or_topic, payload, key: nil, call_original: nil, partition_key: nil, &block) ⇒ void

This method returns an undefined value.

Test that a given handler will consume a given payload correctly, i.e. that the schema is correct. If a block is given, that block will be executed when consume is called. Otherwise it will just confirm that consume is called at all. Deimos::Consumer or the topic as a string

Parameters:

  • handler_class_or_topic (Class, String) —

    Class which inherits from

  • payload (Hash) —

    the payload to consume

  • key (Object) (defaults to: nil) —

    the key to use.

  • call_original (Symbol) (defaults to: nil) —

    legacy parameter.

  • partition_key (Object) (defaults to: nil) —

    the partition key to use.



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# File 'lib/deimos/test_helpers.rb', line 160

def test_consume_message(handler_class_or_topic,
                         payload,
                         key: nil,
                         call_original: nil,
                         partition_key: nil,
                         &block)
  unless call_original.nil?
    puts 'test_consume_message(call_original: true) is deprecated and will be removed' \
         'in the future. You can remove the call_original parameter.'
  end
  test_consume_batch(handler_class_or_topic,
                     [payload],
                     keys: [key],
                     partition_keys: [partition_key],
                     single: true,
                     &block)
end