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Testing Flat Parameter Encoding Implementation in Faraday

This test suite validates the Faraday::FlatParamsEncoder functionality, focusing on parameter encoding and decoding capabilities for HTTP requests. The tests ensure proper handling of arrays, boolean values, and parameter sorting in URL query strings.

Test Coverage Overview

The test suite comprehensively covers parameter encoding and decoding scenarios in Faraday’s flat params encoder.

Key areas tested include:

Array parameter handling and decoding
Boolean value encoding and decoding
Empty array handling in hash parameters
Parameter sorting functionality

Implementation Analysis

The testing approach utilizes RSpec’s shared examples pattern with ‘it_behaves_like’ to ensure consistent encoder behavior. Tests systematically verify both encoding and decoding operations, with specific focus on data type preservation and parameter ordering.

The implementation leverages RSpec’s expect syntax and employs precise test cases for various parameter scenarios.

Technical Details

Testing tools and configuration:

RSpec testing framework
Rack::Utils integration
Frozen string literals enabled
Shared examples for params encoder verification
Dynamic parameter sorting configuration

Best Practices Demonstrated

The test suite exemplifies high-quality testing practices through focused, isolated test cases and clear assertions. Notable practices include:

Consistent test structure and naming
Comprehensive edge case coverage
Shared behavior testing
Configuration state management
Clear input/output expectations

lostisland/faraday

spec/faraday/params_encoders/flat_spec.rb

            
# frozen_string_literal: true

require 'rack/utils'

RSpec.describe Faraday::FlatParamsEncoder do
  it_behaves_like 'a params encoder'

  it 'decodes arrays' do
    query = 'a=one&a=two&a=three'
    expected = { 'a' => %w[one two three] }
    expect(subject.decode(query)).to eq(expected)
  end

  it 'decodes boolean values' do
    query = 'a=true&b=false'
    expected = { 'a' => 'true', 'b' => 'false' }
    expect(subject.decode(query)).to eq(expected)
  end

  it 'encodes boolean values' do
    params = { a: true, b: false }
    expect(subject.encode(params)).to eq('a=true&b=false')
  end

  it 'encodes boolean values in array' do
    params = { a: [true, false] }
    expect(subject.encode(params)).to eq('a=true&a=false')
  end

  it 'encodes empty array in hash' do
    params = { a: [] }
    expect(subject.encode(params)).to eq('a=')
  end

  it 'encodes unsorted when asked' do
    params = { b: false, a: true }
    expect(subject.encode(params)).to eq('a=true&b=false')
    Faraday::FlatParamsEncoder.sort_params = false
    expect(subject.encode(params)).to eq('b=false&a=true')
    Faraday::FlatParamsEncoder.sort_params = true
  end
end