Docker/Wallaby - localhost refused to connect - docker

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?