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Testing Text Input Component Implementation in Simple Form

This test suite validates the functionality of text input handling in Simple Form, focusing on textarea generation and attribute management. The tests cover essential features like placeholder text, character limits, and internationalization support.

Test Coverage Overview

The test suite provides comprehensive coverage of text input functionality in Simple Form.

Key areas tested include:

Basic textarea generation for text attributes
Placeholder text implementation
Internationalization (i18n) support for placeholders
Character length constraints (maxlength/minlength)

Implementation Analysis

The testing approach utilizes ActionView::TestCase for robust view component testing. The implementation follows a systematic pattern of validating HTML element generation and attribute handling.

Technical aspects include:

DOM element verification using assert_select
Translation store management
Attribute validation testing

Technical Details

Testing infrastructure includes:

Minitest framework integration
ActionView test case foundation
Custom test helper methods
Translation management utilities

Best Practices Demonstrated

The test suite exemplifies high-quality testing practices through focused, isolated test cases and comprehensive validation scenarios.

Notable practices include:

Isolated test cases for each feature
Clear test naming conventions
Validation of both basic and edge cases
Proper separation of concerns in test organization

heartcombo/simple_form

test/inputs/text_input_test.rb

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

class TextInputTest < ActionView::TestCase
  test 'input generates a text area for text attributes' do
    with_input_for @user, :description, :text
    assert_select 'textarea.text#user_description'
  end

  test 'input generates a text area for text attributes that accept placeholder' do
    with_input_for @user, :description, :text, placeholder: 'Put in some text'
    assert_select 'textarea.text[placeholder="Put in some text"]'
  end

  test 'input generates a placeholder from the translations' do
    store_translations(:en, simple_form: { placeholders: { user: { name: "placeholder from i18n en.simple_form.placeholders.user.name" } } }) do
      with_input_for @user, :name, :text
      assert_select 'textarea.text[placeholder="placeholder from i18n en.simple_form.placeholders.user.name"]'
    end
  end

  test 'input gets maxlength from column definition for text attributes' do
    with_input_for @user, :description, :text
    assert_select 'textarea.text[maxlength="200"]'
  end

  test 'input infers maxlength column definition from validation when present for text attributes' do
    with_input_for @validating_user, :description, :text
    assert_select 'textarea.text[maxlength="50"]'
  end

  test 'input infers minlength column definition from validation when present for text attributes' do
    with_input_for @validating_user, :description, :text
    assert_select 'textarea.text[minlength="15"]'
  end
end