Back to Repositories

Testing Counter Error Handling Implementation in Fluentd

This test suite validates the error handling functionality in Fluentd’s counter component. It ensures proper error class implementations and message formatting for various error scenarios in the counter system.

Test Coverage Overview

The test suite provides comprehensive coverage of error handling classes in Fluentd’s counter system. It verifies six distinct error types: invalid parameters, unknown keys, parsing errors, method not found, invalid requests, and internal server errors. Each test case validates the proper error code and message formatting.

Tests error class instantiation and message handling
Validates error code mapping
Ensures consistent hash output format

Implementation Analysis

The testing approach utilizes Test::Unit framework with a focused setup for error message handling. Each test case follows a consistent pattern of creating an error instance and validating its hash representation.

Implements setup method for message reuse
Uses assert_equal for hash comparison
Maintains consistent test structure across error types

Technical Details

The test implementation relies on several key components:

Test::Unit as the testing framework
Ruby’s relative require for test helper inclusion
Fluent::Counter::Error module integration
Hash-based error representation

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Ruby. It demonstrates clear test organization with individual test methods for each error type, consistent naming conventions, and proper setup handling. The tests maintain high readability and maintainability through:

DRY principle application with setup method
Consistent test structure and naming
Clear expected vs actual value comparisons
Isolated test cases for each error type

fluent/fluentd

test/counter/test_error.rb

            
require_relative '../helper'
require 'fluent/counter/error'

class CounterErrorTest < ::Test::Unit::TestCase
  setup do
    @message = 'error message'
  end

  test 'invalid_params' do
    error = Fluent::Counter::InvalidParams.new(@message)
    expected = { 'code' => 'invalid_params', 'message' => @message }
    assert_equal expected, error.to_hash
  end

  test 'unknown_key' do
    error = Fluent::Counter::UnknownKey.new(@message)
    expected = { 'code' => 'unknown_key', 'message' => @message }
    assert_equal expected, error.to_hash
  end

  test 'parse_error' do
    error = Fluent::Counter::ParseError.new(@message)
    expected = { 'code' => 'parse_error', 'message' => @message }
    assert_equal expected, error.to_hash
  end

  test 'method_not_found' do
    error = Fluent::Counter::MethodNotFound.new(@message)
    expected = { 'code' => 'method_not_found', 'message' => @message }
    assert_equal expected, error.to_hash
  end

  test 'invalid_request' do
    error = Fluent::Counter::InvalidRequest.new(@message)
    expected = { 'code' => 'invalid_request', 'message' => @message }
    assert_equal expected, error.to_hash
  end

  test 'internal_server_error' do
    error = Fluent::Counter::InternalServerError.new(@message)
    expected = { 'code' => 'internal_server_error', 'message' => @message }
    assert_equal expected, error.to_hash
  end
end