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Testing Time Zone Select Field Implementation in Simple Form

A comprehensive test suite for validating time zone select field functionality in Simple Form’s custom input components. These tests ensure proper rendering, default value handling, and priority options for time zone selection controls.

Test Coverage Overview

The test suite provides thorough coverage of time zone select field implementations in Simple Form.

Key areas tested include:

Basic time zone select field generation
Default value handling and selection
Priority options functionality
Required attribute validation

Implementation Analysis

The testing approach uses ActionView::TestCase as the base framework for UI component validation. Tests utilize Simple Form’s with_input_for helper method to generate and validate select fields, implementing assertions to verify both presence and absence of specific HTML elements and attributes.

Technical Details

Testing tools and configuration:

Minitest framework
ActionView test helpers
assert_select for DOM verification
Custom input helpers from Simple Form
Time zone specific test data

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases for specific functionality
Comprehensive attribute verification
Negative testing (assert_no_select)
Clear test naming conventions
Focused test scenarios with specific assertions

heartcombo/simple_form

test/inputs/time_zone_input_test.rb

            
# frozen_string_literal: true
# encoding: UTF-8
require 'test_helper'

class TimeZoneInputTest < ActionView::TestCase
  test 'input generates a time zone select field' do
    with_input_for @user, :time_zone, :time_zone
    assert_select 'select#user_time_zone'
    assert_select 'select option[value=Brasilia]', '(GMT-03:00) Brasilia'
    assert_no_select 'select option[value=""][disabled=disabled]'
  end

  test 'input generates a time zone select field with default' do
    with_input_for @user, :time_zone, :time_zone, default: 'Brasilia'
    assert_select 'select option[value=Brasilia][selected=selected]'
    assert_no_select 'select option[value=""]'
  end

  test 'input generates a time zone select using options priority' do
    with_input_for @user, :time_zone, :time_zone, priority: /Brasilia/
    assert_select 'select option[value=""][disabled=disabled]'
    assert_no_select 'select option[value=""]', /^$/
  end

  test 'input does generate select element with required html attribute' do
    with_input_for @user, :time_zone, :time_zone
    assert_select 'select.required'
    assert_select 'select[required]'
  end
end