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Testing Input Plugin Router Configuration in Fluentd

This test suite validates the core input functionality of Fluentd, focusing on router configuration and label handling. It ensures proper initialization and routing behavior of Fluentd’s input plugins through comprehensive unit testing.

Test Coverage Overview

The test suite provides essential coverage for Fluentd’s input component routing mechanisms.

Validates default router configuration
Tests label-based routing functionality
Verifies error handling for unknown labels
Ensures proper event router assignment

Implementation Analysis

The testing approach utilizes Test::Unit framework with Fluentd’s custom test driver implementation.

Implements setup and teardown patterns
Uses driver creation helper methods
Leverages Fluentd::Test::InputTestDriver for configuration testing
Employs assertion-based validation

Technical Details

Test::Unit as primary testing framework
Fluent::Test setup utilities
Custom InputTestDriver implementation
Configuration parsing and validation
Event router integration testing

Best Practices Demonstrated

The test suite exemplifies robust testing practices for plugin-based architectures.

Isolated test environment setup
Clear test case organization
Comprehensive error scenario coverage
Effective use of helper methods
Proper assertion usage for validation

fluent/fluentd

test/test_input.rb

            
require_relative 'helper'
require 'fluent/input'

class FluentInputTest < ::Test::Unit::TestCase
  include Fluent

  def setup
    Fluent::Test.setup
  end

  def create_driver(conf = '')
    Fluent::Test::InputTestDriver.new(Fluent::Input).configure(conf, true)
  end

  def test_router
    d = create_driver
    assert_equal Engine.root_agent.event_router, d.instance.router

    d = nil
    assert_nothing_raised {
      d = create_driver('@label @known')
    }
    expected = Engine.root_agent.find_label('@known').event_router
    assert_equal expected, d.instance.router

    # TestDriver helps to create a label instance automatically, so directly test here
    assert_raise(ArgumentError) {
      Fluent::Input.new.configure(Config.parse('@label @unknown', '(test)', '(test_dir)', true))
    }
  end
end