# Pact
Pact is a dependency registry for Elixir to make testing dependencies easier.
## Why?
Because testing Elixir dependencies could be a lot better. Why clutter up your
code injecting dependencies when a process can handle it for you?
* You can declare your modules instead of passing them around like state.
* You can replace dependencies in a block context for easy testing.
* It makes your code cleaner.
## Usage
In your application code:
```elixir
defmodule MyApp.Pact do
use Pact
register "http", HTTPoison
end
MyApp.Pact.start_link
defmodule MyApp.Users do
def all do
MyApp.Pact.get("http").get!("http://foobar.com/api/users")
end
end
```
In your tests:
```elixir
defmodule MyApp.UserTest do
use ExUnit.Case
require MyApp.Pact
test "requests the corrent endpoint" do
fakeHTTP = MyApp.Pact.generate :http do
def get!(url) do
send self(), {:called, url}
end
end
MyApp.Pact.replace "http", fakeHTTP do
MyApp.Users.all
end
assert_receive {:called, "http://foobar.com/api/users"}
end
end
```
You can find more information in the [documentation].
[documentation]: http://hexdocs.pm/pact
## Disclaimer
Pact is very much an experiment at this point to see if it's viable. If you use
Pact please get in touch with me to let me know how it worked out for you or how
you think it could improve. If you have ideas feel free to open an issue or
create a pull request.