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Testing ReceivedHeader Generation Workflows in Postal

This test suite validates the ReceivedHeader class functionality in the Postal mail server, focusing on header generation for different server configurations and protocols. The tests ensure proper formatting of received headers under various conditions including privacy modes and connection types.

Test Coverage Overview

The test suite provides comprehensive coverage of the ReceivedHeader.generate method across multiple scenarios.

Key areas tested include:

Nil server handling
Privacy mode configurations (true/false)
Different protocol types (SMTP/HTTP)
Header string formatting and composition

Integration points include DNS resolution and server configuration parameters.

Implementation Analysis

The testing approach utilizes RSpec’s describe/context/it blocks to organize test cases logically by scenario. The implementation leverages RSpec’s mocking capabilities to stub DNS resolution responses and creates isolated test environments for each case.

Key patterns include dependency injection for server configurations and use of before blocks for shared setup.

Technical Details

Testing tools and configuration:

RSpec as the testing framework
Rails helper integration
DNS resolver mocking
Time-sensitive testing with UTC RFC2822 format
Server model instantiation with configurable privacy modes

Best Practices Demonstrated

The test suite demonstrates several testing best practices including isolation of test cases, proper mocking of external dependencies, and clear scenario organization.

Notable practices:

Consistent use of context blocks for different scenarios
Clear test descriptions
Proper setup and mocking in before blocks
Explicit expected output verification

postalserver/postal

spec/lib/received_header_spec.rb

            
# frozen_string_literal: true

require "rails_helper"

describe ReceivedHeader do
  before do
    allow(DNSResolver.local).to receive(:ip_to_hostname).and_return("hostname.com")
  end

  describe ".generate" do
    context "when server is nil" do
      it "returns the correct string" do
        result = described_class.generate(nil, "testhelo", "1.1.1.1", :smtp)
        expect(result).to eq "from testhelo (hostname.com [1.1.1.1]) " \
                             "by #{Postal::Config.postal.smtp_hostname} " \
                             "with SMTP; #{Time.now.utc.rfc2822}"
      end
    end

    context "when server is provided with privacy_mode=true" do
      it "returns the correct string" do
        server = Server.new(privacy_mode: true)
        result = described_class.generate(server, "testhelo", "1.1.1.1", :smtp)
        expect(result).to eq "by #{Postal::Config.postal.smtp_hostname} " \
                             "with SMTP; #{Time.now.utc.rfc2822}"
      end
    end

    context "when server is provided with privacy_mode=false" do
      it "returns the correct string" do
        server = Server.new(privacy_mode: false)
        result = described_class.generate(server, "testhelo", "1.1.1.1", :smtp)
        expect(result).to eq "from testhelo (hostname.com [1.1.1.1]) " \
                             "by #{Postal::Config.postal.smtp_hostname} " \
                             "with SMTP; #{Time.now.utc.rfc2822}"
      end
    end

    context "when type is http" do
      it "returns the correct string" do
        result = described_class.generate(nil, "web-ui", "1.1.1.1", :http)
        expect(result).to eq "from web-ui (hostname.com [1.1.1.1]) " \
                             "by #{Postal::Config.postal.web_hostname} " \
                             "with HTTP; #{Time.now.utc.rfc2822}"
      end
    end
  end
end