rspec vs rspec-rails: What are the differences?

# Introduction

1. **Rails Integration**: The rspec gem focuses on providing a testing framework for Ruby applications in general, while the rspec-rails gem specifically integrates with Ruby on Rails applications, providing additional functionalities tailored to Rails-specific testing needs.
2. **Generators**: RSpec-rails introduces generator tasks, such as `rails generate rspec:install`, which sets up the necessary configuration for RSpec within a Rails project, while rspec does not provide such Rails-specific generator tasks.
3. **Matchers**: RSpec-rails includes additional matchers that are specific to Rails applications, such as `render_template`, which assists in testing view rendering, while the rspec gem lacks these Rails-specific matchers.
4. **Rails Helpers**: RSpec-rails offers Rails-specific helper methods, like `assigns` for accessing instance variables set in controllers, which are not available in the rspec gem designed for general Ruby applications.
5. **Configuration**: The rspec-rails gem comes with default configurations tailored for Rails projects, such as setting up database cleaner strategies, while rspec requires manual configuration for such functionalities specific to Rails.
6. **Rails-Specific Mocking**: RSpec-rails provides features like stubbing and mocking of Rails methods (e.g., `stub_template` and `stub_model`) that are not included in the rspec gem.

In Summary, the key differences between rspec and rspec-rails lie in Rails integration, generators, matchers, Rails helpers, configuration, and Rails-specific mocking capabilities.