This document introduces ESpec, an Elixir testing framework that provides a behavior-driven development (BDD) style similar to RSpec. It discusses how ESpec was created to bring a familiar RSpec-like testing experience to Elixir developers from Ruby. The document outlines key features of ESpec like describe/context/it blocks, matchers, expectation syntax, before/after hooks, mocking, and output formats. It also briefly introduces ESpec Phoenix for integrating ESpec with Phoenix web apps.

1. ESpec |> Elixir BDD
Anton Mishchuk
#pivorak 10
March 25, 2016

2. About me
- Ruby Developer at Matic Insurance Services Inc
- Big fan of Elixir programming language since 2014
- ESpec package creator & maintainer
- GitHub: antonmi
- Email: anton.mishchuk@gmail.com

3. How the idea was born
- We are from Ruby world
- We like BDD
- We like RSpec
- It would be perfect to have RSpec like BDD testing framework in Elixir!

4. Is it possible to implement RSpec DSL in Elixir?
- Chris McCord “Metaprogramming Elixir”
- Macros to the rescue
- Yes! It is possible!
- ESpec v0.1.0 was released on March 25, 2015
- Current ESpec version is 0.8.16
- hex.pm package: espec
- GitHub: antonmi/espec

5. Do you think this is RSpec code?

6. ESpec - BDD for Elixir
- Test organization with “describe”, “context”, “it”, and etc. blocks
- Familiar matchers “eq”, “be_close_to”, “raise_exception”, etc
- Custom matchers
- Three types of expectation syntax
- “Before” and “finally” blocks
- “let”, “let!” and “subject”
- Shared examples
- Mocking with Erlang “meck” library.
- Async examples
- Doc specs
- HTML and JSON formatted outputs

7. ESpec Phoenix
- ESpec configs, helpers and matchers to use it with Phoenix web framework
- Is on early stage of development. Current version is 0.2.0
- Contributors are welcomed
- Hex.pm package: espec_phoenix
- Github: antonmi/espec_phoenix

8. Thanks for your attention