text: from diagrams import Diagram
  from diagrams.onprem.client import Users
  from diagrams.onprem.container import Docker
  from diagrams.programming.framework import Spring
  
  graph_attr = {
    "fontsize": "20",
    "bgcolor": "white"  # transparent
  }
  
  with Diagram("", direction="LR", graph_attr=graph_attr, outformat="png", filename="testing_architecture"):
    users = Users("Integration Tests")
    backend = Spring("Application")
    database = Docker("PostgreSQL database")
  
    backend >> database
    users >> backend
  