Back to Repositories

Testing CA Certificate Generation Implementation in Fluentd

This test suite validates the CA certificate generation functionality in Fluentd, ensuring proper creation and handling of SSL certificates for secure communications. It covers core certificate generation, file handling, and configuration options validation.

Test Coverage Overview

The test suite provides comprehensive coverage of the CA certificate generation process in Fluentd.

Key areas tested include:

Generation of CA key pairs with default options
File output verification for certificate and key files
Configuration options handling including country, key length, and location details
Error handling for invalid and empty options

Implementation Analysis

The testing approach utilizes Test::Unit framework with FlexMock for mocking capabilities. It implements temporary directory handling for file generation tests and stdout capture for output verification.

Notable patterns include:

Isolated test environments using Dir.mktmpdir
Structured sub-test cases for option configurations
Exception handling validation

Technical Details

Testing tools and dependencies:

Test::Unit as the primary testing framework
Yajl for JSON processing
FlexMock for test doubles
OpenSSL for certificate validation
Temporary directory management for file testing

Best Practices Demonstrated

The test suite exemplifies several testing best practices including proper isolation of test cases, comprehensive error handling, and thorough validation of outputs.

Notable practices:

Clean setup and teardown using temporary directories
Explicit assertion messages
Comprehensive option testing
Proper resource cleanup

fluent/fluentd

test/command/test_ca_generate.rb

            
require_relative '../helper'

require 'yajl'
require 'flexmock/test_unit'
require 'tmpdir'

require 'fluent/command/ca_generate'
require 'fluent/event'

class TestFluentCaGenerate < ::Test::Unit::TestCase
  def test_generate_ca_pair
    cert, key = Fluent::CaGenerate.generate_ca_pair(Fluent::CaGenerate::DEFAULT_OPTIONS)
    assert_equal(OpenSSL::X509::Certificate, cert.class)
    assert_true(key.private?)
  end

  def test_ca_generate
    dumped_output = capture_stdout do
      Dir.mktmpdir do |dir|
        Fluent::CaGenerate.new([dir, "fluentd"]).call
        assert_true(File.exist?(File.join(dir, "ca_key.pem")))
        assert_true(File.exist?(File.join(dir, "ca_cert.pem")))
      end
    end
    expected = <<TEXT
successfully generated: ca_key.pem, ca_cert.pem
copy and use ca_cert.pem to client(out_forward)
TEXT
    assert_equal(expected, dumped_output)
  end

  sub_test_case "configure options" do
    test "should respond multiple options" do
      dumped_output = capture_stdout do
        Dir.mktmpdir do |dir|
          Fluent::CaGenerate.new([dir, "fluentd",
                                  "--country", "JP", "--key-length", "4096",
                                  "--state", "Tokyo", "--locality", "Chiyoda-ku",
                                  "--common-name", "Forward CA"]).call
          assert_true(File.exist?(File.join(dir, "ca_key.pem")))
          assert_true(File.exist?(File.join(dir, "ca_cert.pem")))
        end
      end
      expected = <<TEXT
successfully generated: ca_key.pem, ca_cert.pem
copy and use ca_cert.pem to client(out_forward)
TEXT
      assert_equal(expected, dumped_output)
    end

    test "invalid options" do
      Dir.mktmpdir do |dir|
        assert_raise(OptionParser::InvalidOption) do
          Fluent::CaGenerate.new([dir, "fluentd",
                                  "--invalid"]).call
        end
        assert_false(File.exist?(File.join(dir, "ca_key.pem")))
        assert_false(File.exist?(File.join(dir, "ca_cert.pem")))
      end
    end

    test "empty options" do
      assert_raise(SystemExit) do
        capture_stdout do
          Fluent::CaGenerate.new([]).call
        end
      end
    end
  end
end