devonestes

def intermittent_failures(
      %{id: suite_id},
      spec \\ %{10 => 100, 9 => 80, 8 => 60, 7 => 45, 6 => 32, 5 => 25, 4 => 16, 3 => 9}
    ) do
  limit = spec |> Map.values() |> Enum.max()

  last_100_runs =
    from(r in Run,
      where: r.suite_id == ^suite_id,
      order_by: [desc: r.inserted_at],

devonestes

# My GenServer

defmodule My.GenServer do
  def start_link() do
    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
  end

  def init(_) do
    {:ok, []}
  end

devonestes

# Step 1

def create_subscription(email, plan_id, payment_method_id) do
  with %User{customer_id: nil, name: name} = user <-
         Repo.get_by(User, email: email),
       {:ok, %Stripe.Customer{id: customer_id}} <-
         Stripe.Customer.create(%{
           name: name,
           email: email,
           payment_method: payment_method_id,

devonestes

Muzak

What is Muzak?

Muzak is a mutation testing library for Elixir and Erlang applications.

What is Mutation Testing?

Mutation testing is a way of systematically introducing bugs into your code and then running your tests to see if any of them fail. If you introduce a bug in your code

devonestes

# Given that we have a `User` module, that looks something like this:

defmodule User do
  defstruct [:name]
  
  def changeset(user, params) do
    # ...
  end
end

devonestes

defmodule Mix.Tasks.Credo.Ci do
  @shortdoc "Run Credo only on files that have changed since the last merge commit."

  @moduledoc """
  Runs Credo in CI with somewhat special behavior.

  If the branch being tested is `master`, it runs Credo on all files. Otherwise, it only runs
  Credo on the files that have changed since the last merge commit, and it will fail CI if any
  check doesn't pass for those specific files.
  """