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Top AI Repos tracks AI repositories on GitHub and answers two different questions about each one: is it moving right now, and would you bet a product on it.
Elixir Behaviour Driven Development
| Date | Stars |
|---|---|
| 2026-07-24 | 814 |
| 2026-07-25 | 814 |
| 2026-07-28 | 814 |
| 2026-07-30 | 814 |
| 2026-08-06 | 814 |
Today
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growth rate 0.00%/day
# ESpec
[](https://hex.pm/packages/espec)
## ESpec is a BDD testing framework for Elixir.
ESpec is inspired by RSpec and the main idea is to be close to its perfect DSL.
It is NOT a wrapper around ExUnit but a completely new testing framework written from scratch.
## Features
* Test organization with `describe`, `context`, `it`, and etc blocks.
* Familiar matchers: `eq`, `be_close_to`, `raise_exception`, etc.
* Possibility to add custom matchers.
* There are two types of expectation syntax:
- `expect` syntax with pipe operator `expect smth1 |> to(eq smth2)` or `is_expected |> to(eq smth)` when `subject` is defined;
- `should` syntax: `smth1 |> should(eq smth2)` or `should eq smth` when `subject` is defined.
##### Note: RSpec syntax `expect(smth1).to eq(smth2)` is deprecated and won't work with OTP 21.
* `before` and `finally` blocks (like RSpec `before` and `after`).
* `let`, `let!` and `subject`.
* Shared examples.
* Generated examples.
* Async examples.
* Mocks with Meck.
* Doc specs.
* HTML and JSON outputs.
* Etc and etc.
## Contents
- [Installation](#installation)
- [Run specs](#run-specs)
- [Context blocks and tags](#context-blocks-and-tags)
- [Examples](#examples)
- [Filters](#filters)
- [`before` and `finally`](#before-and-finally)
- [`before_all` and `after_all`](#before_all-and-after_all)
- [`shared` data](#shared-data)
- [`let` and `subject`](#let-and-subject)
- [Shared examples](#shared-examples)
- [Generated examples](#generated-examples)
- [Async examples](#async-examples)
- [Matchers](#matchers)
- [`assert` and `refute`](#assert-and-refute)
- [`assert_receive` and `refute_receive`](#assert_receive-and-refute_receive)
- [`capture_io` and `capture_log`](#capture_io-and-capture_log)
- [Custom matchers](#custom-matchers)
- [`described_module`](#described_module)
- [Mocks](#mocks)
- [Datetime Comparison](#datetime-comparison)
- [Doc specs](#doc-specs)
- [Configuration and options](#configuration-and-options)
- [Formatters](#formatters)
- [Changelog](#changelog)
- [Contributing](#contributing)
## Installation
Add `espec` to dependencies in the `mix.exs` file:
```elixir
def deps do
...
{:espec, "~> 1.10.0", only: :test},
...
end
```
```sh
mix deps.get
```
Then run:
```sh
MIX_ENV=test mix espec.init
```
The task creates `spec/spec_helper.exs`
Set `preferred_cli_env` for `espec` in the `mix.exs` file:
```elixir
def project do
...
preferred_cli_env: [espec: :test],
...
end
```
Or run with `MIX_ENV=test`:
```sh
MIX_ENV=test mix espec
```
Place your `_spec.exs` files into `spec` folder. `use ESpec` in the 'spec module'.
```elixir
defmodule SyntaxExampleSpec do
use ESpec
it do: expect true |> to(be_true())
it do: (1..3) |> should(have 2)
end
```
## Run specs
```sh
mix espec
```
Run specific spec:
```sh
mix espec spec/some_spec.exs:25
```
Read the help:
```sh
MIX_ENV=test mix help espec
```
## Context blocks and tags
There are three macros with the same functionality: `context`, `describe`, and `example_group`.
Context can have description and tags.
```elixir
defmodule ContextSpec do
use ESpec
example_group do
context "Some context" do
it do: expect "abc" |> to(match ~r/b/)
end
describe "Some another context with opts", focus: true do
it do: 5 |> should(be_between 4, 6)
end
end
end
```
Available tags are:
* `skip: true` or `skip: "Reason"` - skips examples in the context;
* `focus: true` - sets focus to run with `--focus ` option.
There are also `xcontext`, `xdescribe`, `xexample_group` macros to skip example groups.
And `fcontext`, `fdescribe`, `fexample_group` for focused groups.
'spec' module is also a context with module name as description. One can add tags for this context after `use ESpec:`
```elixir
defmodule ContextTagsSpec do
use ESpec, skip: "Skip all examples in the module"
...
end
```
## Examples
`example`, `it`, and `specExcerpt of 37,955 characters
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Would you bet a product on this? Bounded 0–100 and slow moving.
matched fp:198a9e0a4fcfb1d6, topic:testing