Add dependencies for API Authentication.

.drone.yaml

@@ -0,0 +1,52 @@
+kind: pipeline
+type: docker
+name: default
+
+environment:
+  DATABASE_NAME: link_shortener_dev
+  DATABASE_USERNAME: postgres
+  DATABASE_PASSWORD: postgres
+  DATABASE_HOST: postgres
+  DATABASE_PORT: 5432
+  SECRET_KEY_BASE: TestSecretKeycRZ1H45gfdAsdf8DIb45df4664mRCruzwVEF68wosddfg324ost
+
+steps:
+  - name: install dependencies
+    image: elixir:1.14.0-slim
+    volumes:
+      - name: mix
+        path: /root/.mix
+    commands:
+      - mix local.hex --force
+      - mix local.rebar --force
+      - mix deps.get
+      - mix compile
+
+  - name: run migrations
+    image: elixir:1.14.0-slim
+    volumes:
+      - name: mix
+        path: /root/.mix
+    commands:
+      - mix ecto.setup
+
+  - name: run tests
+    image: elixir:1.14.0-slim
+    volumes:
+      - name: mix
+        path: /root/.mix
+    commands:
+      - mix test
+
+volumes:
+- name: mix
+  temp: {}
+
+services:
+  - name: postgres
+    image: postgres:15-alpine
+    environment:
+      POSTGRES_DB: link_shortener_dev
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+

CHANGELOG.org

@@ -34,4 +34,18 @@
     Fix the route path in LinkController.create/2.
 ** 0.4.6 <2023-08-01 Tue>
     Add the API to update the Link model.
+** 0.4.7 <2023-08-01 Tue>
+    Add tests for the API.
+** 0.4.8 <2023-08-02 Wed>
+    Refactor the Links module.
+** 0.4.9 <2023-08-02 Wed>
+    Add tests for the Links module.
+** 0.4.10 <2023-08-03 Thu>
+    Add the CI/CD configuration.
+    Add the test config.
 
+** 0.5.1 <2023-08-04 Fri>
+    Add a generator for Link with random shorten.
+    Update Links.create_one to use a function.
+** 0.5.2 <2023-08-05 Sat>
+    Add dependencies for API Authentication.

config/test.exs

@@ -0,0 +1,30 @@
+import Config
+
+# Configure your database
+#
+# The MIX_TEST_PARTITION environment variable can be used
+# to provide built-in test partitioning in CI environment.
+# Run `mix help test` for more information.
+config :link_shortener, LinkShortener.Repo,
+  username: System.get_env("DATABASE_USERNAME"),
+  password: System.get_env("DATABASE_PASSWORD"),
+  hostname: System.get_env("DATABASE_HOST"),
+  database: "link_shortener_test#{System.get_env("MIX_TEST_PARTITION")}",
+  pool: Ecto.Adapters.SQL.Sandbox,
+  pool_size: 10
+
+# We don't run a server during test. If one is required,
+# you can enable the server option below.
+config :link_shortener, LinkShortenerWeb.Endpoint,
+  http: [ip: {127, 0, 0, 1}, port: 4002],
+  secret_key_base: System.get_env("SECRET_KEY_BASE"),
+  server: false
+
+# In test we don't send emails.
+config :link_shortener, LinkShortener.Mailer, adapter: Swoosh.Adapters.Test
+
+# Print only warnings and errors during test
+config :logger, level: :warn
+
+# Initialize plugs at runtime for faster test compilation
+config :phoenix, :plug_init_mode, :runtime

lib/link_shortener/generators/link_with_random_shorten.ex

@@ -0,0 +1,14 @@
+defmodule LinkShortener.Generators.LinkWithRandomShorten do
+  @moduledoc """
+  This module provides a generator for Link.
+  """
+
+  alias LinkShortener.Generators.SafeString
+
+  @doc """
+  Generate a Link with random shorten with the length.
+  """
+  def generate_one(attrs, length \\ 10, generator \\ &SafeString.generate/1) do
+    Map.put(attrs, :shorten, generator.(length))
+  end
+end

lib/link_shortener/links/links.ex

@@ -1,16 +1,16 @@
-defmodule LinkShortener.Links.Links do
+defmodule LinkShortener.Links do
   use Ecto.Schema
   import Ecto.Changeset
   import Ecto.Query
   alias LinkShortener.Repo
   alias LinkShortener.Links.Link
-  alias LinkShortener.Generators.SafeString
+  alias LinkShortener.Generators.LinkWithRandomShorten, as: LinkGenerator
 
-  def new_one(), do: Link.changeset(%Link{})
+  def new_one(), do: Link.changeset(%Link{}, %{})
 
-  def create_one(attrs, length \\ 10, generator \\ SafeString) do
-    shorten = generator.generate(length)
-    insert_one(Map.put(attrs, :shorten, shorten))
+  def create_one(attrs, length \\ 10, generator \\ &LinkGenerator.generate_one/2) do
+    generator.(attrs, length)
+    |> insert_one()
   end
 
   def insert_one(attrs) do
@@ -19,25 +19,10 @@ defmodule LinkShortener.Links.Links do
     |> Repo.insert()
   end
 
-  def edit_one(id) do
-    get_one(id)
-    |> Link.changeset()
+  def get_one!(id) do
+    Repo.get!(Link, id)
   end
 
-  def update_one(%Link{} = link, changes) do
-    link
-    |> Link.changeset(changes)
-    |> Repo.update()
-  end
-
-  def insert_one(attrs) do
-    %Link{}
-    |> Link.changeset(attrs)
-    |> Repo.insert()
-  end
-
-  def delete_one(%Link{} = link), do: Repo.delete(link)
-
   def get_one_by(attrs) do
     Repo.get_by(Link, attrs)
   end
@@ -46,12 +31,26 @@ defmodule LinkShortener.Links.Links do
     get_one_by(%{shorten: shorten})
   end
 
-  def get_one(id) do
-    Repo.get!(Link, id)
+  def get_all() do
+    from(Link)
+    |> Repo.all()
   end
 
   def get_all(opts) do
     from(Link)
     |> Repo.all()
   end
+
+  def edit_one(%Link{} = link) do
+    link
+    |> Link.changeset(%{})
+  end
+
+  def update_one(%Link{} = link, changes) do
+    link
+    |> Link.changeset(changes)
+    |> Repo.update()
+  end
+
+  def delete_one(%Link{} = link), do: Repo.delete(link)
 end

lib/link_shortener_web/controllers/api/v1/link_controller.ex

@@ -1,13 +1,13 @@
 defmodule LinkShortenerWeb.Api.V1.LinkController do
   use LinkShortenerWeb, :controller
 
-  alias LinkShortener.Links.Links
+  alias LinkShortener.Links
   alias LinkShortener.Links.Link
 
   action_fallback LinkShortenerWeb.FallbackController
 
   def index(conn, _params) do
-    links = Links.get_all({})
+    links = Links.get_all()
     render(conn, "index.json", links: links)
   end
 
@@ -21,12 +21,12 @@ defmodule LinkShortenerWeb.Api.V1.LinkController do
   end
 
   def show(conn, %{"id" => id}) do
-    link = Links.get_one(id)
+    link = Links.get_one!(id)
     render(conn, "show.json", link: link)
   end
 
   def update(conn, %{"id" => id, "link" => link_params}) do
-    link = Links.get_one(id)
+    link = Links.get_one!(id)
 
     with {:ok, %Link{} = link} <- Links.update_one(link, link_params) do
       render(conn, "show.json", link: link)
@@ -34,7 +34,7 @@ defmodule LinkShortenerWeb.Api.V1.LinkController do
   end
 
   def delete(conn, %{"id" => id}) do
-    link = Links.get_one(id)
+    link = Links.get_one!(id)
 
     with {:ok, %Link{}} <- Links.delete_one(link) do
       send_resp(conn, :no_content, "")

mix.exs

@@ -48,7 +48,10 @@ defmodule LinkShortener.MixProject do
       {:telemetry_poller, "~> 1.0"},
       {:gettext, "~> 0.18"},
       {:jason, "~> 1.2"},
-      {:plug_cowboy, "~> 2.5"}
+      {:plug_cowboy, "~> 2.5"},
+      {:guardian, "~> 1.0"},
+      {:comeonin, "~> 4.0"},
+      {:bcrypt_elixir, "~> 1.0"}
     ]
   end
 

mix.lock

@@ -1,5 +1,7 @@
 %{
+  "bcrypt_elixir": {:hex, :bcrypt_elixir, "1.1.1", "6b5560e47a02196ce5f0ab3f1d8265db79a23868c137e973b27afef928ed8006", [:make, :mix], [{:elixir_make, "~> 0.4", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "10f658be786bd2daaadcd45cc5b598da01d5bbc313da4d0e3efb2d6a511d896d"},
   "castore": {:hex, :castore, "1.0.3", "7130ba6d24c8424014194676d608cb989f62ef8039efd50ff4b3f33286d06db8", [:mix], [], "hexpm", "680ab01ef5d15b161ed6a95449fac5c6b8f60055677a8e79acf01b27baa4390b"},
+  "comeonin": {:hex, :comeonin, "4.1.2", "3eb5620fd8e35508991664b4c2b04dd41e52f1620b36957be837c1d7784b7592", [:mix], [{:argon2_elixir, "~> 1.2", [hex: :argon2_elixir, repo: "hexpm", optional: true]}, {:bcrypt_elixir, "~> 0.12.1 or ~> 1.0", [hex: :bcrypt_elixir, repo: "hexpm", optional: true]}, {:pbkdf2_elixir, "~> 0.12", [hex: :pbkdf2_elixir, repo: "hexpm", optional: true]}], "hexpm", "d8700a0ca4dbb616c22c9b3f6dd539d88deaafec3efe66869d6370c9a559b3e9"},
   "cowboy": {:hex, :cowboy, "2.10.0", "ff9ffeff91dae4ae270dd975642997afe2a1179d94b1887863e43f681a203e26", [:make, :rebar3], [{:cowlib, "2.12.1", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "1.8.0", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "3afdccb7183cc6f143cb14d3cf51fa00e53db9ec80cdcd525482f5e99bc41d6b"},
   "cowboy_telemetry": {:hex, :cowboy_telemetry, "0.4.0", "f239f68b588efa7707abce16a84d0d2acf3a0f50571f8bb7f56a15865aae820c", [:rebar3], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:telemetry, "~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "7d98bac1ee4565d31b62d59f8823dfd8356a169e7fcbb83831b8a5397404c9de"},
   "cowlib": {:hex, :cowlib, "2.12.1", "a9fa9a625f1d2025fe6b462cb865881329b5caff8f1854d1cbc9f9533f00e1e1", [:make, :rebar3], [], "hexpm", "163b73f6367a7341b33c794c4e88e7dbfe6498ac42dcd69ef44c5bc5507c8db0"},
@@ -7,12 +9,15 @@
   "decimal": {:hex, :decimal, "2.1.1", "5611dca5d4b2c3dd497dec8f68751f1f1a54755e8ed2a966c2633cf885973ad6", [:mix], [], "hexpm", "53cfe5f497ed0e7771ae1a475575603d77425099ba5faef9394932b35020ffcc"},
   "ecto": {:hex, :ecto, "3.10.2", "6b887160281a61aa16843e47735b8a266caa437f80588c3ab80a8a960e6abe37", [: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 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "6a895778f0d7648a4b34b486af59a1c8009041fbdf2b17f1ac215eb829c60235"},
   "ecto_sql": {:hex, :ecto_sql, "3.10.1", "6ea6b3036a0b0ca94c2a02613fd9f742614b5cfe494c41af2e6571bb034dd94c", [:mix], [{:db_connection, "~> 2.5 or ~> 2.4.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:ecto, "~> 3.10.0", [hex: :ecto, repo: "hexpm", optional: false]}, {:myxql, "~> 0.6.0", [hex: :myxql, repo: "hexpm", optional: true]}, {:postgrex, "~> 0.16.0 or ~> 0.17.0 or ~> 1.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:tds, "~> 2.1.1 or ~> 2.2", [hex: :tds, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "f6a25bdbbd695f12c8171eaff0851fa4c8e72eec1e98c7364402dda9ce11c56b"},
+  "elixir_make": {:hex, :elixir_make, "0.7.7", "7128c60c2476019ed978210c245badf08b03dbec4f24d05790ef791da11aa17c", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}], "hexpm", "5bc19fff950fad52bbe5f211b12db9ec82c6b34a9647da0c2224b8b8464c7e6c"},
   "esbuild": {:hex, :esbuild, "0.7.1", "fa0947e8c3c3c2f86c9bf7e791a0a385007ccd42b86885e8e893bdb6631f5169", [:mix], [{:castore, ">= 0.0.0", [hex: :castore, repo: "hexpm", optional: false]}], "hexpm", "66661cdf70b1378ee4dc16573fcee67750b59761b2605a0207c267ab9d19f13c"},
   "expo": {:hex, :expo, "0.4.1", "1c61d18a5df197dfda38861673d392e642649a9cef7694d2f97a587b2cfb319b", [:mix], [], "hexpm", "2ff7ba7a798c8c543c12550fa0e2cbc81b95d4974c65855d8d15ba7b37a1ce47"},
   "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},
   "floki": {:hex, :floki, "0.34.3", "5e2dcaec5d7c228ce5b1d3501502e308b2d79eb655e4191751a1fe491c37feac", [:mix], [], "hexpm", "9577440eea5b97924b4bf3c7ea55f7b8b6dce589f9b28b096cc294a8dc342341"},
   "gettext": {:hex, :gettext, "0.22.3", "c8273e78db4a0bb6fba7e9f0fd881112f349a3117f7f7c598fa18c66c888e524", [:mix], [{:expo, "~> 0.4.0", [hex: :expo, repo: "hexpm", optional: false]}], "hexpm", "935f23447713954a6866f1bb28c3a878c4c011e802bcd68a726f5e558e4b64bd"},
+  "guardian": {:hex, :guardian, "1.2.1", "bdc8dd3dbf0fb7216cb6f91c11831faa1a64d39cdaed9a611e37f2413e584983", [:mix], [{:jose, "~> 1.8", [hex: :jose, repo: "hexpm", optional: false]}, {:phoenix, "~> 1.3", [hex: :phoenix, repo: "hexpm", optional: true]}, {:plug, "~> 1.3.3 or ~> 1.4", [hex: :plug, repo: "hexpm", optional: true]}], "hexpm", "723fc404edfb7bd5cba4cd83329b352037f102aa97468f44e58ac7f47c136a98"},
   "jason": {:hex, :jason, "1.4.0", "e855647bc964a44e2f67df589ccf49105ae039d4179db7f6271dfd3843dc27e6", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "79a3791085b2a0f743ca04cec0f7be26443738779d09302e01318f97bdb82121"},
+  "jose": {:hex, :jose, "1.11.6", "613fda82552128aa6fb804682e3a616f4bc15565a048dabd05b1ebd5827ed965", [:mix, :rebar3], [], "hexpm", "6275cb75504f9c1e60eeacb771adfeee4905a9e182103aa59b53fed651ff9738"},
   "mime": {:hex, :mime, "2.0.5", "dc34c8efd439abe6ae0343edbb8556f4d63f178594894720607772a041b04b02", [:mix], [], "hexpm", "da0d64a365c45bc9935cc5c8a7fc5e49a0e0f9932a761c55d6c52b142780a05c"},
   "phoenix": {:hex, :phoenix, "1.6.16", "e5bdd18c7a06da5852a25c7befb72246de4ddc289182285f8685a40b7b5f5451", [:mix], [{:castore, ">= 0.0.0", [hex: :castore, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 2.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:phoenix_view, "~> 1.0 or ~> 2.0", [hex: :phoenix_view, repo: "hexpm", optional: false]}, {:plug, "~> 1.10", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.2", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:plug_crypto, "~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "e15989ff34f670a96b95ef6d1d25bad0d9c50df5df40b671d8f4a669e050ac39"},
   "phoenix_ecto": {:hex, :phoenix_ecto, "4.4.2", "b21bd01fdeffcfe2fab49e4942aa938b6d3e89e93a480d4aee58085560a0bc0d", [:mix], [{:ecto, "~> 3.5", [hex: :ecto, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 2.14.2 or ~> 3.0", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:plug, "~> 1.9", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "70242edd4601d50b69273b057ecf7b684644c19ee750989fd555625ae4ce8f5d"},

test/link_shortener/links_test.exs

@@ -0,0 +1,106 @@
+defmodule LinkShortener.LinksTest do
+  use LinkShortener.DataCase
+
+  alias LinkShortener.Links
+
+  @create_attrs %{
+    name: "some link name",
+    url: "https://gitlab.com/KKlochko/link_shortener",
+    shorten: "git_repo",
+  }
+  @create_generated_attrs %{
+    name: "some link name",
+    url: "https://gitlab.com/KKlochko/link_shortener",
+  }
+  @update_attrs %{
+    name: "some updated link name",
+    url: "https://gitlab.com/KKlochko/link_shortener2",
+    shorten: "new_git_repo",
+  }
+  @invalid_attrs %{
+    name: nil,
+    url: nil,
+    shorten: nil,
+  }
+
+  describe "links" do
+    alias LinkShortener.Links.Link
+
+    import LinkShortener.LinksFixtures
+
+    test "new_one/1 returns the changeset" do
+      assert %Ecto.Changeset{} = Links.new_one()
+    end
+
+    test "create_one/1 with valid data creates a link" do
+      assert {:ok, %Link{} = link} = Links.create_one(@create_generated_attrs)
+      assert link.name == "some link name"
+      assert link.url == "https://gitlab.com/KKlochko/link_shortener"
+      assert String.length(link.shorten) == 10
+    end
+
+    test "create_one/2 with valid data creates a link" do
+      assert {:ok, %Link{} = link} = Links.create_one(@create_generated_attrs, 5)
+      assert link.name == "some link name"
+      assert link.url == "https://gitlab.com/KKlochko/link_shortener"
+      assert String.length(link.shorten) == 5
+    end
+
+    test "insert_one/1 with valid data creates a link" do
+      assert {:ok, %Link{} = link} = Links.insert_one(@create_attrs)
+      assert link.name == "some link name"
+      assert link.url == "https://gitlab.com/KKlochko/link_shortener"
+      assert link.shorten == "git_repo"
+    end
+
+    test "insert_one/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Links.insert_one(@invalid_attrs)
+    end
+
+    test "get_one!/1 returns the link with given id" do
+      link = link_fixture()
+      assert Links.get_one!(link.id) == link
+    end
+
+    test "get_one_by!/1 returns the link with given shorten" do
+      link = link_fixture()
+      assert Links.get_one_by(%{shorten: link.shorten}) == link
+    end
+
+    test "get_one_by_shorten!/1 returns the link with given shorten" do
+      link = link_fixture()
+      assert Links.get_one_by_shorten(link.shorten) == link
+    end
+
+    test "get_all/0 returns all links" do
+      link = link_fixture()
+      assert Links.get_all() == [link]
+    end
+
+    test "edit_one/1 with valid data returns the changeset" do
+      link = link_fixture()
+      assert %Ecto.Changeset{} = Links.edit_one(link)
+    end
+
+    test "update_one/2 with valid data updates the link" do
+      link = link_fixture()
+
+      assert {:ok, %Link{} = link} = Links.update_one(link, @update_attrs)
+      assert link.name == "some updated link name"
+      assert link.url == "https://gitlab.com/KKlochko/link_shortener2"
+      assert link.shorten == "new_git_repo"
+    end
+
+    test "update_link/2 with invalid data returns error changeset" do
+      link = link_fixture()
+      assert {:error, %Ecto.Changeset{}} = Links.update_one(link, @invalid_attrs)
+      assert link == Links.get_one!(link.id)
+    end
+
+    test "delete_one/1 deletes the link" do
+      link = link_fixture()
+      assert {:ok, %Link{}} = Links.delete_one(link)
+      assert_raise Ecto.NoResultsError, fn -> Links.get_one!(link.id) end
+    end
+  end
+end

test/link_shortener_web/controllers/api/v1/link_controller_test.exs

@@ -0,0 +1,97 @@
+defmodule LinkShortenerWeb.Api.V1.LinkControllerTest do
+  use LinkShortenerWeb.ConnCase
+
+  import LinkShortener.LinksFixtures
+
+  alias LinkShortener.Links.Link
+  alias LinkShortener.Links
+
+  @create_attrs %{
+    name: "some link name",
+    url: "https://gitlab.com/KKlochko/link_shortener",
+    shorten: "git_repo",
+  }
+  @update_attrs %{
+    name: "some updated link name",
+    url: "https://gitlab.com/KKlochko/link_shortener2",
+    shorten: "new_git_repo",
+  }
+  @invalid_attrs %{
+    name: nil,
+    url: nil,
+    shorten: nil,
+  }
+
+  setup %{conn: conn} do
+    {:ok, conn: put_req_header(conn, "accept", "application/json")}
+  end
+
+  describe "index" do
+    test "lists all links", %{conn: conn} do
+      conn = get(conn, Routes.v1_link_path(conn, :index))
+      assert json_response(conn, 200)["data"] == []
+    end
+  end
+
+  describe "create link" do
+    test "renders link when data is valid", %{conn: conn} do
+      conn = post(conn, Routes.v1_link_path(conn, :create), link: @create_attrs)
+      assert %{"id" => id} = json_response(conn, 201)["data"]
+
+      conn = get(conn, Routes.v1_link_path(conn, :show, id))
+
+      assert %{
+               "id" => ^id,
+	       "name" => "some link name",
+	       "url" => "https://gitlab.com/KKlochko/link_shortener",
+	       "shorten" => "git_repo",
+             } = json_response(conn, 200)["data"]
+    end
+
+    test "renders errors when data is invalid", %{conn: conn} do
+      conn = post(conn, Routes.v1_link_path(conn, :create), link: @invalid_attrs)
+      assert json_response(conn, 422)["errors"] != %{}
+    end
+  end
+
+  describe "update link" do
+    setup [:create_link]
+
+    test "renders link when data is valid", %{conn: conn, link: %Link{id: id} = link} do
+      conn = put(conn, Routes.v1_link_path(conn, :update, link), link: @update_attrs)
+      assert %{"id" => ^id} = json_response(conn, 200)["data"]
+
+      conn = get(conn, Routes.v1_link_path(conn, :show, id))
+
+      assert %{
+               "id" => ^id,
+	       "name" => "some updated link name",
+	       "url" => "https://gitlab.com/KKlochko/link_shortener2",
+	       "shorten" => "new_git_repo",
+             } = json_response(conn, 200)["data"]
+    end
+
+    test "renders errors when data is invalid", %{conn: conn, link: link} do
+      conn = put(conn, Routes.v1_link_path(conn, :update, link), link: @invalid_attrs)
+      assert json_response(conn, 422)["errors"] != %{}
+    end
+  end
+
+  describe "delete link" do
+    setup [:create_link]
+
+    test "deletes chosen link", %{conn: conn, link: link} do
+      conn = delete(conn, Routes.v1_link_path(conn, :delete, link))
+      assert response(conn, 204)
+
+      assert_error_sent 404, fn ->
+        get(conn, Routes.v1_link_path(conn, :show, link))
+      end
+    end
+  end
+
+  defp create_link(_) do
+    link = link_fixture()
+    %{link: link}
+  end
+end

test/link_shortener_web/controllers/page_controller_test.exs

@@ -0,0 +1,8 @@
+defmodule LinkShortenerWeb.PageControllerTest do
+  use LinkShortenerWeb.ConnCase
+
+  test "GET /", %{conn: conn} do
+    conn = get(conn, "/")
+    assert html_response(conn, 200) =~ "Usage"
+  end
+end

test/link_shortener_web/views/error_view_test.exs

@@ -0,0 +1,14 @@
+defmodule LinkShortenerWeb.ErrorViewTest do
+  use LinkShortenerWeb.ConnCase, async: true
+
+  # Bring render/3 and render_to_string/3 for testing custom views
+  import Phoenix.View
+
+  test "renders 404.html" do
+    assert render_to_string(LinkShortenerWeb.ErrorView, "404.html", []) == "Not Found"
+  end
+
+  test "renders 500.html" do
+    assert render_to_string(LinkShortenerWeb.ErrorView, "500.html", []) == "Internal Server Error"
+  end
+end

test/link_shortener_web/views/layout_view_test.exs

@@ -0,0 +1,8 @@
+defmodule LinkShortenerWeb.LayoutViewTest do
+  use LinkShortenerWeb.ConnCase, async: true
+
+  # When testing helpers, you may want to import Phoenix.HTML and
+  # use functions such as safe_to_string() to convert the helper
+  # result into an HTML string.
+  # import Phoenix.HTML
+end

test/link_shortener_web/views/page_view_test.exs

@@ -0,0 +1,3 @@
+defmodule LinkShortenerWeb.PageViewTest do
+  use LinkShortenerWeb.ConnCase, async: true
+end

test/support/conn_case.ex

@@ -0,0 +1,38 @@
+defmodule LinkShortenerWeb.ConnCase do
+  @moduledoc """
+  This module defines the test case to be used by
+  tests that require setting up a connection.
+
+  Such tests rely on `Phoenix.ConnTest` and also
+  import other functionality to make it easier
+  to build common data structures and query the data layer.
+
+  Finally, if the test case interacts with the database,
+  we enable the SQL sandbox, so changes done to the database
+  are reverted at the end of every test. If you are using
+  PostgreSQL, you can even run database tests asynchronously
+  by setting `use LinkShortenerWeb.ConnCase, async: true`, although
+  this option is not recommended for other databases.
+  """
+
+  use ExUnit.CaseTemplate
+
+  using do
+    quote do
+      # Import conveniences for testing with connections
+      import Plug.Conn
+      import Phoenix.ConnTest
+      import LinkShortenerWeb.ConnCase
+
+      alias LinkShortenerWeb.Router.Helpers, as: Routes
+
+      # The default endpoint for testing
+      @endpoint LinkShortenerWeb.Endpoint
+    end
+  end
+
+  setup tags do
+    LinkShortener.DataCase.setup_sandbox(tags)
+    {:ok, conn: Phoenix.ConnTest.build_conn()}
+  end
+end

test/support/data_case.ex

@@ -0,0 +1,58 @@
+defmodule LinkShortener.DataCase do
+  @moduledoc """
+  This module defines the setup for tests requiring
+  access to the application's data layer.
+
+  You may define functions here to be used as helpers in
+  your tests.
+
+  Finally, if the test case interacts with the database,
+  we enable the SQL sandbox, so changes done to the database
+  are reverted at the end of every test. If you are using
+  PostgreSQL, you can even run database tests asynchronously
+  by setting `use LinkShortener.DataCase, async: true`, although
+  this option is not recommended for other databases.
+  """
+
+  use ExUnit.CaseTemplate
+
+  using do
+    quote do
+      alias LinkShortener.Repo
+
+      import Ecto
+      import Ecto.Changeset
+      import Ecto.Query
+      import LinkShortener.DataCase
+    end
+  end
+
+  setup tags do
+    LinkShortener.DataCase.setup_sandbox(tags)
+    :ok
+  end
+
+  @doc """
+  Sets up the sandbox based on the test tags.
+  """
+  def setup_sandbox(tags) do
+    pid = Ecto.Adapters.SQL.Sandbox.start_owner!(LinkShortener.Repo, shared: not tags[:async])
+    on_exit(fn -> Ecto.Adapters.SQL.Sandbox.stop_owner(pid) end)
+  end
+
+  @doc """
+  A helper that transforms changeset errors into a map of messages.
+
+      assert {:error, changeset} = Accounts.create_user(%{password: "short"})
+      assert "password is too short" in errors_on(changeset).password
+      assert %{password: ["password is too short"]} = errors_on(changeset)
+
+  """
+  def errors_on(changeset) do
+    Ecto.Changeset.traverse_errors(changeset, fn {message, opts} ->
+      Regex.replace(~r"%{(\w+)}", message, fn _, key ->
+        opts |> Keyword.get(String.to_existing_atom(key), key) |> to_string()
+      end)
+    end)
+  end
+end

test/support/fixtures/links_fixtures.ex

@@ -0,0 +1,24 @@
+defmodule LinkShortener.LinksFixtures do
+  @moduledoc """
+  This module defines test helpers for creating
+  entities via the `LinkShortener.Links` context.
+  """
+
+  alias LinkShortener.Links
+
+  @doc """
+  Generate a link.
+  """
+  def link_fixture(attrs \\ %{}) do
+    {:ok, link} =
+      attrs
+      |> Enum.into(%{
+        name: "some name",
+	url: "https://gitlab.com/KKlochko/link_shortener",
+	shorten: "api-article",
+      })
+      |> Links.create_one()
+
+    link
+  end
+end

test/test_helper.exs

@@ -0,0 +1,2 @@
+ExUnit.start()
+Ecto.Adapters.SQL.Sandbox.mode(LinkShortener.Repo, :manual)