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Property-Based Testing Advent Calendar 2018

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Category:Library & Framework
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@spinute

テストケースをいい感じに自動生成し、もりもりバグを取りながらも可読性・メンテナンス性の高いテストが書けるという噂の、Property-Based Testing (PBT) についての記事を書きます。

Property-Based Testing with PropEr, Erlang, and Elixir を読んで基本的な内容を整理したあと、適当な OSS のテストを書いてみたり、「みんなのデータ構造」という本の実装に Property-Based なテストを書いたりしながら解説をしようと思っています。

参考文献は Erlang/Elixir を採用しており、「みんなのデータ構造」のサンプル実装は Golang で書いたため、私の記事はそれらの言語でやっていく予定です。一方、PBT といえば Scala や Haskell が特に有名だと思うので、これらの言語での PBT について記事を書いてくださる方も歓迎します!

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day4(リスケしました)

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便利な Property の例(仮)

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便利な Property の例(仮)

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Shrinking を理解する(仮)

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状態のあるアプリを PBT でテストする(仮)

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状態のあるアプリを PBT でテストする(仮)

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  15. 便利な Property の例(仮)

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  16. 便利な Property の例(仮)

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  17. Shrinking を理解する(仮)

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  18. 状態のあるアプリを PBT でテストする(仮)

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  19. 状態のあるアプリを PBT でテストする(仮)

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day4(リスケしました)

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About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

便利な Property の例(仮)

Overwrite

You can post either your article on Qiita or your blog post.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

便利な Property の例(仮)

Overwrite

You can post either your article on Qiita or your blog post.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

Shrinking を理解する(仮)

Overwrite

You can post either your article on Qiita or your blog post.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

状態のあるアプリを PBT でテストする(仮)

Overwrite

You can post either your article on Qiita or your blog post.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

状態のあるアプリを PBT でテストする(仮)

Overwrite

You can post either your article on Qiita or your blog post.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

Join calendar on 20 day

You can also reserve a slot without registering a title or URL.

Articles to be submitted are welcome on any website as well as on Qiita.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

Join calendar on 21 day

You can also reserve a slot without registering a title or URL.

Articles to be submitted are welcome on any website as well as on Qiita.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

Overwrite

You can post either your article on Qiita or your blog post.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

Join calendar on 23 day

You can also reserve a slot without registering a title or URL.

Articles to be submitted are welcome on any website as well as on Qiita.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

Join calendar on 24 day

You can also reserve a slot without registering a title or URL.

Articles to be submitted are welcome on any website as well as on Qiita.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

Join calendar on 25 day

You can also reserve a slot without registering a title or URL.

Articles to be submitted are welcome on any website as well as on Qiita.

About reserved posting

If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

About posting period

Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

When you participate, we will assume that you have agreed to the terms of use

26272829
  1. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  2. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  3. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  4. Join calendar on 4 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  5. Join calendar on 5 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  6. Join calendar on 6 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  7. Join calendar on 7 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  8. Join calendar on 8 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  9. day4(リスケしました)

    Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  10. Join calendar on 10 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  11. Join calendar on 11 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  12. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  13. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  14. Join calendar on 14 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  15. 便利な Property の例(仮)

    Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  16. 便利な Property の例(仮)

    Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  17. Shrinking を理解する(仮)

    Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  18. 状態のあるアプリを PBT でテストする(仮)

    Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  19. 状態のあるアプリを PBT でテストする(仮)

    Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  20. Join calendar on 20 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  21. Join calendar on 21 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  22. Overwrite

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  23. Join calendar on 23 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  24. Join calendar on 24 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

  25. Join calendar on 25 day

    You can also reserve a slot without registering a title or URL.

    Articles to be submitted are welcome on any website as well as on Qiita.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

    About posting period

    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed to the terms of use

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