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Testing StringLike Field Type Configuration in RailsAdmin

This test suite validates the RailsAdmin StringLike field type implementation, focusing on empty string handling and nullable field behavior. The tests ensure proper configuration and parsing of string-like fields in the Rails Admin interface.

Test Coverage Overview

The test suite provides comprehensive coverage of the StringLike field type functionality in RailsAdmin:

Nullable field behavior testing
Empty string handling validation
Parameter parsing verification
Configuration option testing

Implementation Analysis

The testing approach uses RSpec to validate two main aspects of StringLike fields:

The treat_empty_as_nil? method behavior is tested across nullable and non-nullable fields. The parse_input functionality is verified with different configuration settings and input scenarios, using mock FieldTest objects.

Technical Details

Testing tools and setup:

RSpec as the testing framework
ActiveRecord integration testing
Mock Team and FieldTest models
RailsAdmin configuration blocks
Subject-based test organization

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Contextual test organization using RSpec describe and context blocks
Isolated test cases with proper setup and teardown
Clear test descriptions and expectations
Comprehensive edge case coverage
DRY principle application through shared subject definitions

railsadminteam/rails_admin

spec/rails_admin/config/fields/types/string_like_spec.rb

            
# frozen_string_literal: true

require 'spec_helper'

RSpec.describe RailsAdmin::Config::Fields::Types::StringLike do
  describe '#treat_empty_as_nil?', active_record: true do
    context 'with a nullable field' do
      subject do
        RailsAdmin.config('Team').fields.detect do |f|
          f.name == :name
        end.with(object: Team.new)
      end

      it 'is true' do
        expect(subject.treat_empty_as_nil?).to be true
      end
    end

    context 'with a non-nullable field' do
      subject do
        RailsAdmin.config('Team').fields.detect do |f|
          f.name == :manager
        end.with(object: Team.new)
      end

      it 'is false' do
        expect(subject.treat_empty_as_nil?).to be false
      end
    end
  end

  describe '#parse_input' do
    subject do
      RailsAdmin.config('FieldTest').fields.detect do |f|
        f.name == :string_field
      end.with(object: FieldTest.new)
    end

    context 'with treat_empty_as_nil being true' do
      before do
        RailsAdmin.config FieldTest do
          field :string_field do
            treat_empty_as_nil true
          end
        end
      end

      context 'when value is empty' do
        let(:params) { {string_field: ''} }

        it 'makes the value nil' do
          subject.parse_input(params)
          expect(params.key?(:string_field)).to be true
          expect(params[:string_field]).to be nil
        end
      end

      context 'when value does not exist in params' do
        let(:params) { {} }

        it 'does not touch params' do
          subject.parse_input(params)
          expect(params.key?(:string_field)).to be false
        end
      end
    end

    context 'with treat_empty_as_nil being false' do
      before do
        RailsAdmin.config FieldTest do
          field :string_field do
            treat_empty_as_nil false
          end
        end
      end
      let(:params) { {string_field: ''} }

      it 'keeps the value untouched' do
        subject.parse_input(params)
        expect(params.key?(:string_field)).to be true
        expect(params[:string_field]).to eq ''
      end
    end
  end
end