Docker/Wallaby - localhost refused to connect

Question

I am trying to run my feature test using Wallaby but I keep getting the localhost refused to connect error.

Here is my compose.yml:

version: '2'
services:
  app:
    image: hin101/phoenix:1.5.1
    build: .
    restart: always
    ports:
      - "4000:4000"
      - "4002:4002"
    volumes:
      - ./src:/app
    depends_on:
      - db
      - selenium
    hostname: app
  db:
    image: postgres:10
    restart: always
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
      - POSTGRES_DB=hinesh_blogs
    ports:
      - 5432:5432
    volumes:
      - database:/var/lib/postgresql/data

  selenium:
    build:
      context: .
      dockerfile: Dockerfile-selenium
    container_name: selenium
    image: selenium/standalone-chrome-debug:2.52.0
    restart: always
    ports:
      - "4444:4444"
      - "5900:5900"
    hostname: selenium

volumes:
  database:

test_helper.ex:

ExUnit.start()
Ecto.Adapters.SQL.Sandbox.mode(HineshBlogs.Repo, :auto)
{:ok, _} = Application.ensure_all_started(:ex_machina)
Application.put_env(:wallaby, :base_url, HineshBlogsWeb.Endpoint.url)
Application.put_env(:wallaby, :screenshot_on_failure, true)
{:ok, _} = Application.ensure_all_started(:wallaby)

config/test.exs:

use Mix.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 :hinesh_blogs, HineshBlogs.Repo,
  username: "postgres",
  password: "postgres",
  database: "hinesh_blogs_test#{System.get_env("MIX_TEST_PARTITION")}",
  hostname: "db",
  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 :hinesh_blogs, HineshBlogsWeb.Endpoint,
  http: [port: 4002],
  server: true

config :hinesh_blogs, :sql_sandbox, true

# Print only warnings and errors during test
config :logger, level: :warn

# Selenium
config :wallaby, otp_app: :hinesh_blogs_web, base_url: "http://localhost:4002/", driver: Wallaby.Selenium, hackney_options: [timeout: :infinity, recv_timeout: :infinity]

I run the tests using the command: docker-compose run app mix test

Do I need to have any additional configurations to run these tests and if not, what is the best way to configure wallaby to use docker containers?