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Testing Windows File Operations Implementation in Fluentd

This test suite validates the Windows-specific file handling functionality in Fluentd, focusing on the WindowsFile wrapper class. It ensures proper file operations and exception handling for Windows environments through comprehensive unit tests.

Test Coverage Overview

The test suite provides thorough coverage of WindowsFile operations in Windows environments, focusing on error handling and file access scenarios.

Tests file creation and access permissions
Validates error handling for non-existent files
Verifies behavior with deleted/pending files
Covers critical Windows-specific file operations

Implementation Analysis

The testing approach utilizes Test::Unit framework with sub-test cases to organize related test scenarios. It implements temporary file creation and cleanup patterns to ensure isolated test environments.

Uses setup/teardown methods for test isolation
Implements sub_test_case for logical grouping
Employs assertion methods for validation
Handles resource cleanup in ensure blocks

Technical Details

Test::Unit as the primary testing framework
FileUtils for directory management
Environment variable TEST_ENV_NUMBER for parallel test execution
Temporary directory creation for isolated testing
Windows-specific conditional execution

Best Practices Demonstrated

The test suite exemplifies robust testing practices through proper resource management and error handling verification. Each test case is focused and includes appropriate cleanup mechanisms.

Proper resource cleanup in teardown
Isolated test environments
Comprehensive exception handling
Platform-specific conditional testing
Clear test case organization

fluent/fluentd

test/test_file_wrapper.rb

            
require_relative 'helper'
require 'fluent/file_wrapper'

class FileWrapperTest < Test::Unit::TestCase
  TMP_DIR = File.dirname(__FILE__) + "/../tmp/file_wrapper#{ENV['TEST_ENV_NUMBER']}"

  def setup
    FileUtils.mkdir_p(TMP_DIR)
  end

  def teardown
    FileUtils.rm_rf(TMP_DIR)
  end

  sub_test_case 'WindowsFile exceptions' do
    test 'nothing raised' do
      begin
        path = "#{TMP_DIR}/test_windows_file.txt"
        file1 = file2 = nil
        file1 = File.open(path, "wb") do |f|
        end
        assert_nothing_raised do
          file2 = Fluent::WindowsFile.new(path)
        ensure
          file2.close
        end
      ensure
        file1.close if file1
      end
    end

    test 'Errno::ENOENT raised' do
      path = "#{TMP_DIR}/nofile.txt"
      file = nil
      assert_raise(Errno::ENOENT) do
        file = Fluent::WindowsFile.new(path)
      ensure
        file.close if file
      end
    end

    test 'Errno::ENOENT raised on DeletePending' do
      path = "#{TMP_DIR}/deletepending.txt"
      file = Fluent::WindowsFile.new(path, mode='w')
      File.delete(path)
      assert_raise(Errno::ENOENT) do
        file.stat
      ensure
        file.close if file
      end
    end
  end
end if Fluent.windows?