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Testing ExcerptDrop Data Inheritance Implementation in Jekyll

This test suite validates the ExcerptDrop functionality in Jekyll, focusing on document excerpt handling and liquid drop behavior. It ensures proper inheritance and data handling between documents and their excerpts.

Test Coverage Overview

The test suite provides comprehensive coverage of Jekyll’s excerpt drop functionality, particularly focusing on document-excerpt relationships and data inheritance.

Tests excerpt drop instantiation and type validation
Verifies excerpt data inheritance from parent documents
Validates layout handling between documents and excerpts
Ensures proper key inheritance and inspectability

Implementation Analysis

The testing approach utilizes Ruby’s test framework with Jekyll-specific assertions to validate excerpt behavior. It implements fixture-based testing with a structured context for excerpt drops.

Uses context blocks for organized test grouping
Implements setup blocks for test state initialization
Employs should blocks for behavior specification
Utilizes assertion methods for verification

Technical Details

Testing Framework: JekyllUnitTest
Fixture Setup: fixture_site method
Key Classes: Jekyll::Document, Jekyll::Drops::DocumentDrop, Jekyll::Excerpt
Test Helpers: assert_kind_of, assert_nil, assert_equal
Environment: Frozen string literal mode

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Ruby and Jekyll development.

Proper test isolation through setup blocks
Clear test naming conventions
Comprehensive type checking
Explicit assertion messages
Structured test organization

jekyll/jekyll

test/test_excerpt_drop.rb

            
# frozen_string_literal: true

require "helper"

class TestExcerptDrop < JekyllUnitTest
  context "an excerpt drop" do
    setup do
      @site = fixture_site
      @site.read
      @doc = @site.docs_to_write.find { |d| !d.data["layout"].nil? }
      @doc_drop = @doc.to_liquid
      @excerpt = @doc.data["excerpt"]
      @excerpt_drop = @excerpt.to_liquid
    end

    should "have the right thing" do
      assert_kind_of Jekyll::Document, @doc
      assert_kind_of Jekyll::Drops::DocumentDrop, @doc_drop
      assert_kind_of Jekyll::Excerpt, @excerpt
      assert_kind_of Jekyll::Drops::ExcerptDrop, @excerpt_drop
    end

    should "not have an excerpt" do
      assert_nil @excerpt.data["excerpt"]
      assert @excerpt_drop.class.invokable? "excerpt"
      assert_nil @excerpt_drop["excerpt"]
    end

    should "inherit the layout for the drop but not the excerpt" do
      assert_nil @excerpt.data["layout"]
      assert_equal @doc_drop["layout"], @excerpt_drop["layout"]
    end

    should "be inspectable" do
      refute_empty @excerpt_drop.inspect
    end

    should "inherit values from the document" do
      assert_equal @doc_drop.keys.sort, @excerpt_drop.keys.sort
    end
  end
end