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Testing Custom JSON Serializer Implementation in PaperTrail

This test suite validates the custom JSON serialization functionality in PaperTrail, focusing on proper handling of key-value pairs during serialization and deserialization. The tests ensure robust data handling by verifying the removal of blank keys and nil values during these operations.

Test Coverage Overview

The test suite provides comprehensive coverage of the CustomJsonSerializer class, specifically examining both load and dump operations.

Tests serialization with mixed valid and invalid key-value pairs
Verifies proper handling of nil values and empty keys
Ensures consistent JSON formatting during serialization
Validates deserialization cleanup behavior

Implementation Analysis

The testing approach utilizes RSpec’s describe/it blocks to organize test cases logically around the serializer’s main methods. The implementation leverages RSpec’s expectation syntax to verify JSON transformation behavior, with specific focus on data cleaning during serialization processes.

Uses described_class for flexible test maintenance
Implements precise JSON string comparison
Employs hash transformation validation

Technical Details

Testing Framework: RSpec
Custom Components: CustomJsonSerializer class
Key Methods Tested: load() and dump()
Test Data: Hash with mixed valid/invalid entries
Assertion Methods: eq matcher

Best Practices Demonstrated

The test suite exemplifies several testing best practices including isolation of test cases and clear specification of expected behaviors. Each test focuses on a single aspect of the serializer’s functionality, making the suite maintainable and debugging-friendly.

Isolated test cases for each operation
Clear input/output expectations
Consistent test data structures
Focused method testing

paper-trail-gem/paper_trail

spec/paper_trail/serializers/custom_json_serializer_spec.rb

            
# frozen_string_literal: true

require "spec_helper"
require_relative "../../support/custom_json_serializer"

RSpec.describe CustomJsonSerializer do
  describe ".load" do
    it "deserializes, removing pairs with blank keys or values" do
      hash = { "key1" => "banana", "tkey" => nil, "" => "foo" }
      expect(described_class.load(hash.to_json)).to(eq("key1" => "banana"))
    end
  end

  describe ".dump" do
    it "serializes to JSON, removing pairs with nil values" do
      hash = { "key1" => "banana", "tkey" => nil, "" => "foo" }
      expect(described_class.dump(hash)).to(eq('{"key1":"banana","":"foo"}'))
    end
  end
end