https://github.com/hschne/factories-or-fixtures

https://github.com/hschne/factories-or-fixtures

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• Host: GitHub
• URL: https://github.com/hschne/factories-or-fixtures
• Owner: hschne
• Created: 2024-01-13T20:40:24.000Z (10 months ago)
• Default Branch: main
• Last Pushed: 2024-01-13T20:40:54.000Z (10 months ago)
• Last Synced: 2024-10-28T10:07:43.223Z (16 days ago)
• Language: Ruby
• Size: 31.3 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Factories or Fixtures

Why not both? This is a demo application to illustrate the performance differences between using fixtures and factories. 

## Setup

The test suite in this repository consists of 2000 CRUD tests for comment functionality. Each comment belongs to a user and post.

```ruby

# test/factories/comment.rb

FactoryBot.define do

  factory :comment do

    text { 'text' }

    user

    post

  end

end

```

```yml

# test/fixtures/comments.yml

default:

  text: text

  user: default

  post: default

```

Tests are run with a setup using FactoryBot as well as a setup using fixtures, as well as a hybrid setup. Parallelization is disabled.

```ruby

# comments_controller_test.rb

setup do

  # @comment = comments(:default)

  # vs

  # @comment = create(:comment)

  # vs

  # @comment = create(:comment, post: posts(:default), user: users(:default))

end

```

```bash

bundle exec rake test

```

## Profiling

To generate a stack profile run:

```bash

TEST_STACK_PROF=1 bin/rails test

```

Then upload the generated report to [speedscope](https://www.speedscope.app/). To profile events via ActiveSupport notifications run:

```bash

EVENT_PROF='sql.active_record' bundle exec rake test

```

```bash

 EVENT_PROF=factory.create bundle exec rake test

```

## Results

On 2000 tests this test suite uses around 30% of it's time on setup when using FactoryBot. When using only fixtures that overhead just goes away. 

```text

[TEST PROF INFO] EventProf results for factory.create

Total time: 00:07.520 of 00:25.654 (29.32%)

Total events: 2000

```

Overall, test run times on an XPS 13 9300 can be found below. 

|            | Total | runs/s |

|------------|-------|--------|

| FactoryBot | 18s   | 107    |

| Fixtures   | 12s   | 171    |

| Hybrid     | 16s   | 116    |