Code for step 1

.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+store_inventory-*.tar
+

README.md

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+# StoreInventory
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `store_inventory` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:store_inventory, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/store_inventory](https://hexdocs.pm/store_inventory).
+

config/config.exs

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+import Config
+
+config :store_inventory, ecto_repos: [StoreInventory.Repo]
+
+config :store_inventory, StoreInventory.Repo,
+  database: "store_inventory_repo",
+  username: "postgres",
+  password: "postgres",
+  hostname: "localhost"
+
+import_config "#{Mix.env()}.exs"

config/dev.exs

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+import Config
+
+config :store_inventory, repo: StoreInventory.Repo

config/test.exs

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+import Config
+
+config :store_inventory, repo: StoreInventory.TestRepo

lib/store_inventory.ex

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+defmodule StoreInventory do
+  @moduledoc """
+  Documentation for `StoreInventory`.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> StoreInventory.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end

lib/store_inventory/application.ex

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+defmodule StoreInventory.Application do
+  @moduledoc false
+
+  use Application
+
+  def start(_type, _args) do
+    opts = [strategy: :one_for_one, name: StoreInventory.Supervisor]
+    Supervisor.start_link(get_children(), opts)
+  end
+
+  defp get_children do
+    case Mix.env() do
+      :test -> []
+      _ -> [StoreInventory.Repo]
+    end
+  end
+end

lib/store_inventory/repo.ex

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+defmodule StoreInventory.Repo do
+  use Ecto.Repo,
+    otp_app: :store_inventory,
+    adapter: Ecto.Adapters.Postgres
+end

mix.exs

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+defmodule StoreInventory.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :store_inventory,
+      version: "0.1.0",
+      elixir: "~> 1.10",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger],
+      mod: {StoreInventory.Application, []}
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      {:ecto_sql, "~> 3.0"},
+      {:postgrex, ">= 0.0.0"}
+    ]
+  end
+end

mix.lock

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+%{
+  "connection": {:hex, :connection, "1.0.4", "a1cae72211f0eef17705aaededacac3eb30e6625b04a6117c1b2db6ace7d5976", [:mix], [], "hexpm", "4a0850c9be22a43af9920a71ab17c051f5f7d45c209e40269a1938832510e4d9"},
+  "db_connection": {:hex, :db_connection, "2.2.2", "3bbca41b199e1598245b716248964926303b5d4609ff065125ce98bcd368939e", [:mix], [{:connection, "~> 1.0.2", [hex: :connection, repo: "hexpm", optional: false]}], "hexpm", "642af240d8a8affb93b4ba5a6fcd2bbcbdc327e1a524b825d383711536f8070c"},
+  "decimal": {:hex, :decimal, "1.8.1", "a4ef3f5f3428bdbc0d35374029ffcf4ede8533536fa79896dd450168d9acdf3c", [:mix], [], "hexpm", "3cb154b00225ac687f6cbd4acc4b7960027c757a5152b369923ead9ddbca7aec"},
+  "ecto": {:hex, :ecto, "3.4.4", "a2c881e80dc756d648197ae0d936216c0308370332c5e77a2325a10293eef845", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "cc4bd3ad62abc3b21fb629f0f7a3dab23a192fca837d257dd08449fba7373561"},
+  "ecto_sql": {:hex, :ecto_sql, "3.4.4", "d28bac2d420f708993baed522054870086fd45016a9d09bb2cd521b9c48d32ea", [:mix], [{:db_connection, "~> 2.2", [hex: :db_connection, repo: "hexpm", optional: false]}, {:ecto, "~> 3.4.3", [hex: :ecto, repo: "hexpm", optional: false]}, {:myxql, "~> 0.3.0 or ~> 0.4.0", [hex: :myxql, repo: "hexpm", optional: true]}, {:postgrex, "~> 0.15.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:tds, "~> 2.1.0", [hex: :tds, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "edb49af715dd72f213b66adfd0f668a43c17ed510b5d9ac7528569b23af57fe8"},
+  "postgrex": {:hex, :postgrex, "0.15.4", "5d691c25fc79070705a2ff0e35ce0822b86a0ee3c6fdb7a4fb354623955e1aed", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}, {:db_connection, "~> 2.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.5", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "306515b9d975fcb2478dc337a1d27dc3bf8af7cd71017c333fe9db3a3d211b0a"},
+  "telemetry": {:hex, :telemetry, "0.4.1", "ae2718484892448a24470e6aa341bc847c3277bfb8d4e9289f7474d752c09c7f", [:rebar3], [], "hexpm", "4738382e36a0a9a2b6e25d67c960e40e1a2c95560b9f936d8e29de8cd858480f"},
+}

test/store_inventory_test.exs

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+defmodule StoreInventoryTest do
+  use ExUnit.Case
+  doctest StoreInventory
+
+  test "greets the world" do
+    assert StoreInventory.hello() == :world
+  end
+end

test/test_helper.exs

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+ExUnit.start()