Back to Repositories

Testing MessagePack Formatter Implementation in Fluentd

This test suite validates the MessagePack formatter functionality in Fluentd, ensuring proper serialization of log event data. The tests verify the formatter’s ability to convert record data into MessagePack format while maintaining data integrity.

Test Coverage Overview

The test suite provides focused coverage of the MessagePack formatter component in Fluentd.

Key areas tested include:

Basic record serialization to MessagePack format
Handling of standard log event components (tag, time, message)
Verification of MessagePack output integrity

Implementation Analysis

The testing approach utilizes Fluentd’s test driver framework for formatter validation. The implementation follows a straightforward unit testing pattern, creating a formatter instance with default configuration and verifying its output against expected MessagePack-encoded data.

Technical implementation features:

Test driver initialization with MessagePackFormatter
Event time handling
Record structure validation

Technical Details

Testing infrastructure includes:

Fluentd Test::Unit framework
Formatter test driver
MessagePack library integration
Event time utilities

Configuration is minimal, focusing on default formatter behavior without additional parameters.

Best Practices Demonstrated

The test suite exemplifies clean and efficient testing practices for Fluentd plugins.

Notable practices include:

Proper test setup and driver initialization
Clear separation of test data preparation
Direct assertion of expected vs actual output
Focused scope for formatter functionality

fluent/fluentd

test/plugin/test_formatter_msgpack.rb

            
require_relative '../helper'
require 'fluent/test/driver/formatter'
require 'fluent/plugin/formatter_msgpack'

class MessagePackFormatterTest < ::Test::Unit::TestCase
  def setup
    @time = event_time
  end

  def create_driver(conf = "")
    Fluent::Test::Driver::Formatter.new(Fluent::Plugin::MessagePackFormatter).configure(conf)
  end

  def tag
    "tag"
  end

  def record
    {'message' => 'awesome'}
  end

  def test_format
    d = create_driver({})
    formatted = d.instance.format(tag, @time, record)

    assert_equal(record.to_msgpack, formatted)
  end
end