Tests are essential to any serious software component.
Writing integration tests with Munit and Requests is straightforward.

Here we are testing the API from the JSON API tutorial.
Create a file json_api.test.scala and paste this code into it:

      //> using scala "3.4.2"
//> using dep ba.sake::sharaf:0.8.0
//> using test.dep org.scalameta::munit::1.0.0-M10

import ba.sake.tupson.*

case class Car(brand: String, model: String, quantity: Int) derives JsonRW

class JsonApiSuite extends munit.FunSuite {

  val baseUrl = "http://localhost:8181"

  test("create and get cars") {
    locally {
      val res = requests.get(s"$baseUrl/cars")
      val resBody = res.text.parseJson[Seq[Car]]
      assertEquals(res.statusCode, 200)
      assertEquals(res.headers("content-type"), Seq("application/json"))
      assertEquals(res.text.parseJson[Seq[Car]], Seq.empty)
    }

    locally {
      val body = Car("Mercedes", "ML350", 1)
      val res = requests.post(s"$baseUrl/cars", data = body.toJson)
      assertEquals(res.statusCode, 200)
    }

    locally {
      val res = requests.get(s"$baseUrl/cars/Mercedes")
      val resBody = res.text.parseJson[Seq[Car]]
      assertEquals(res.statusCode, 200)
      assertEquals(res.headers("content-type"), Seq("application/json"))
      assertEquals(resBody, Seq(Car("Mercedes", "ML350", 1)))
    }
  }
}

First run the API server in one shell:

scala-cli test json_api.sc

and then run the tests in another shell:

scala-cli test json_api.test.scala