feat: Add Missing Methods for Messages

Resolved novuhq#20

lib/novu/messages.ex

@@ -0,0 +1,25 @@
+defmodule Novu.Messages do
+  @moduledoc """
+  Provide access to the Novu Messages API
+  """
+
+  alias Novu.Http
+
+  @doc """
+  Retrieves messages
+  [API Documentation](https://docs.novu.co/api-reference/messages/get-messages)
+  """
+  @spec get_messages :: Http.response()
+  def get_messages do
+    Http.get("/v1/messages")
+  end
+
+  @doc """
+  Delete messages
+  [API Documentation](https://docs.novu.co/api-reference/messages/delete-message)
+  """
+  @spec delete_messages(message_id :: String.t()) :: Http.response()
+  def delete_messages(message_id) do
+    Http.delete("/v1/messages/#{message_id}")
+  end
+end

test/novu/messages.exs

@@ -0,0 +1,46 @@
+defmodule Novu.MessagesTest do
+  use ExUnit.Case
+
+  import Novu.ApiTestHelpers
+
+  alias Novu.Messages
+
+  @test_api_key "test-api-key"
+
+  setup do
+    bypass = Bypass.open()
+
+    current_domain = Application.get_env(:novu, :domain)
+
+    Application.put_env(:novu, :domain, "http://localhost:#{bypass.port}")
+    Application.put_env(:novu, :api_key, @test_api_key)
+
+    on_exit(fn ->
+      Application.put_env(:novu, :domain, current_domain)
+    end)
+
+    {:ok, bypass: bypass}
+  end
+
+  describe "get_messages/1" do
+    test "creates a GET to /v1/messages", %{bypass: bypass} do
+      Bypass.expect(bypass, "GET", "/v1/messages", fn conn ->
+        novu_response(conn, 200, %{page: 0, totalCount: 0, pageSize: 10, data: []})
+      end)
+
+      assert {:ok, _body} = Messages.get_messages()
+    end
+  end
+
+  describe "delete_subscriber/1" do
+    test "creates a DELETE to /v1/messages/{messageId}", %{bypass: bypass} do
+      message_id = "example-id"
+
+      Bypass.expect(bypass, "DELETE", "/v1/messages/#{URI.encode(message_id)}", fn conn ->
+        novu_response(conn, 200, %{acknowledged: true, status: "deleted"})
+      end)
+
+      assert {:ok, _body} = Messages.delete_message(message_id)
+    end
+  end
+end