# ExUnit.Let
If you're coming from RSpec, you might be missing `let`. This is kind of like that, but also not at all.
ExUnit.Let is a really tiny shorthand for `setup`. It allows you to test like this:
```elixir
defmodule MyTest do
use ExUnit.Case
use ExUnit.Let
let :a, do: 1
let :b, %{a: a}, do: a + 1
test "a", %{a: a} do
assert a == 1
end
test "b", %{b: b} do
assert b == 2
end
end
```
Basically, the examples above just boil down to this:
```elixir
setup do: [a: 1]
setup %{a: a}, do: [a + 1]
```
It's not buying you much other than visual greppability.
## Installation
If [available in Hex](https://hex.pm/docs/publish), the package can be installed as:
1. Add `ex_unit_let` to your list of dependencies in `mix.exs`:
```elixir
def deps do
[{:ex_unit_let, "~> 0.1.0"}]
end
```
2. Ensure `ex_unit_let` is started before your application:
```elixir
def application do
[applications: [:ex_unit_let]]
end
```