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Testing Association Declaration Equality in Factory Bot

This test suite evaluates the equality comparison functionality of Association declarations in Factory Bot. It specifically focuses on verifying the correct implementation of the equality operator (==) for association declarations, ensuring proper comparison behavior across different scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of association declaration equality comparisons in Factory Bot.

Key areas tested include:

Equal associations with matching names and options
Unequal associations with different names
Unequal associations with different options
Comparison with non-declaration objects

Implementation Analysis

The testing approach utilizes RSpec’s context-based structure to organize different equality comparison scenarios. The implementation employs described_class to reference the Association class dynamically, following RSpec best practices for maintainable test organization.

The tests use explicit expectation syntax with eq matcher to verify equality behavior.

Technical Details

Testing tools and setup:

RSpec as the testing framework
Factory Bot’s Declaration::Association class
Equality operator (==) testing
Context-based test organization
Expectation-based assertions

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Clear context separation for different test scenarios
Consistent test structure and naming
Isolated test cases for specific behaviors
Proper use of RSpec’s described_class
Comprehensive edge case coverage

thoughtbot/factory_bot

spec/factory_bot/declaration/association_spec.rb

            
describe FactoryBot::Declaration::Association do
  describe "#==" do
    context "when the attributes are equal" do
      it "the objects are equal" do
        declaration = described_class.new(:name, options: true)
        other_declaration = described_class.new(:name, options: true)

        expect(declaration).to eq(other_declaration)
      end
    end

    context "when the names are different" do
      it "the objects are NOT equal" do
        declaration = described_class.new(:name, options: true)
        other_declaration = described_class.new(:other_name, options: true)

        expect(declaration).not_to eq(other_declaration)
      end
    end

    context "when the options are different" do
      it "the objects are NOT equal" do
        declaration = described_class.new(:name, options: true)
        other_declaration = described_class.new(:name, other_options: true)

        expect(declaration).not_to eq(other_declaration)
      end
    end

    context "when comparing against another type of object" do
      it "the objects are NOT equal" do
        declaration = described_class.new(:name)

        expect(declaration).not_to eq(:not_a_declaration)
      end
    end
  end
end