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Testing If Tag Conditional Logic Implementation in Shopify/Liquid

This test suite validates the functionality of Liquid’s if tag implementation, focusing on the proper parsing and evaluation of conditional statements in templates. The tests ensure the nodelist structure maintains correct branching logic for if/else conditions.

Test Coverage Overview

The test coverage focuses on verifying the fundamental structure of if/else conditional statements in Liquid templates. Key areas include:

Nodelist structure validation for if/else branches
Template parsing accuracy
Conditional statement evaluation
Branch content preservation

Implementation Analysis

The testing approach employs Minitest to verify the Liquid template engine’s parsing capabilities. The implementation uses direct template parsing and nodelist inspection to ensure proper conditional logic structure.

The test validates that both IF and ELSE branch content is correctly preserved in the template’s internal representation.

Technical Details

Testing infrastructure includes:

Minitest framework for unit testing
Liquid::Template parsing engine
Node traversal through root.nodelist
Array mapping for content verification

Best Practices Demonstrated

The test exemplifies several testing best practices:

Isolated unit testing of specific template functionality
Direct assertion of internal data structures
Clear test method naming
Focused test scope with single responsibility

shopify/liquid

test/unit/tags/if_tag_unit_test.rb

            
# frozen_string_literal: true

require 'test_helper'

class IfTagUnitTest < Minitest::Test
  def test_if_nodelist
    template = Liquid::Template.parse('{% if true %}IF{% else %}ELSE{% endif %}')
    assert_equal(['IF', 'ELSE'], template.root.nodelist[0].nodelist.map(&:nodelist).flatten)
  end
end