Add examples of mill + cask + scalasql

example/scalalib/web/10-todo-webapp-cask-scalasql/build.mill

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+package build
+
+import mill._, scalalib._
+
+object `package` extends RootModule with ScalaModule {
+  def scalaVersion = "2.13.8"
+
+  override def ivyDeps = Agg(
+    ivy"com.lihaoyi::cask:0.9.1",
+    ivy"com.lihaoyi::scalatags:0.13.1",
+    ivy"com.lihaoyi::upickle:3.1.0",
+    ivy"com.lihaoyi::scalasql:0.1.19",
+    ivy"com.h2database:h2:2.2.224"
+  )
+
+  object test extends TestModule
+
+  object integration extends IntegrationTestModule
+
+  /** Common test setup */
+  trait TestBase extends ScalaModule {
+    def scalaVersion = `package`.scalaVersion
+    override def repositories = super.repositories ++ Seq(
+      coursier.MavenRepository("https://oss.sonatype.org/content/repositories/snapshots")
+    )
+    override def moduleDeps = Seq(`package`)
+  }
+
+  /** Unit tests using H2 */
+  trait TestModule extends TestBase with ScalaTests {
+    def testFramework = "utest.runner.Framework"
+
+    override def ivyDeps = super.ivyDeps() ++ Agg(
+      ivy"com.lihaoyi::utest:0.8.5",
+      ivy"com.lihaoyi::requests:0.6.9"
+    )
+  }
+
+  /** Integration tests using PostgreSQL Testcontainers */
+  trait IntegrationTestModule extends TestBase with ScalaTests {
+    def testFramework = "utest.runner.Framework"
+
+    override def ivyDeps = super.ivyDeps() ++ Agg(
+      ivy"com.lihaoyi::utest:0.8.5",
+      ivy"com.dimafeng::testcontainers-scala-postgresql:0.43.0",
+      ivy"com.dimafeng::testcontainers-scala-scalatest:0.43.0",
+      ivy"org.testcontainers:postgresql:1.19.1"
+    )
+  }
+}

example/scalalib/web/10-todo-webapp-cask-scalasql/integration/webapp/WebAppIntegrationTests.scala

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+package webapp
+
+import utest._
+import requests._
+import com.dimafeng.testcontainers.PostgreSQLContainer
+import org.testcontainers.utility.DockerImageName
+import scala.concurrent.blocking
+import scala.sys.process._
+import scala.concurrent.duration._
+import scala.util.Try
+
+object WebAppIntegrationTests extends TestSuite {
+
+  val tests = Tests {
+    var serverPid: Option[Process] = None
+    val serverPort = 8080
+
+    val pgContainer = PostgreSQLContainer(
+      dockerImageNameOverride = DockerImageName.parse("postgres:15"),
+      databaseName = "testdb",
+      username = "postgres",
+      password = "password"
+    )
+
+    def waitForServer(port: Int, timeout: FiniteDuration = 100.seconds): Boolean = {
+      val deadline = timeout.fromNow
+      while (deadline.hasTimeLeft()) {
+        Try(requests.get(s"http://localhost:$port/")).toOption match {
+          case Some(response) if response.statusCode == 200 => return true
+          case _ =>
+            Thread.sleep(500)
+        }
+      }
+      false
+    }
+
+    test("start postgres container and app server") {
+      pgContainer.start()
+
+      val envVars = Seq(
+        "DB_URL" -> pgContainer.jdbcUrl,
+        "DB_USER" -> pgContainer.username,
+        "DB_PASS" -> pgContainer.password
+      )
+
+      val cmd = Seq("mill", "runBackground")
+      val pb = Process(cmd, None, envVars: _*)
+      serverPid = Some(pb.run())
+
+      val started = waitForServer(serverPort)
+      require(started, "Server did not start in time")
+    }
+
+    test("add and list todos") {
+      val response = requests.post(s"http://localhost:$serverPort/add/all", data = "")
+      assert(response.statusCode == 200)
+      assert(response.text.contains("What needs to be done"))
+
+      val response2 = requests.post(s"http://localhost:$serverPort/list/all", data = "")
+      assert(response2.text.contains("What needs to be done"))
+    }
+
+    test("toggle and delete todo") {
+      // Toggle doesn't change DB but should still return 200
+      val response = requests.post(s"http://localhost:$serverPort/toggle/all/1", data = "")
+      assert(response.statusCode == 200)
+
+      val deleteResp = requests.post(s"http://localhost:$serverPort/delete/all/1", data = "")
+      assert(deleteResp.statusCode == 200)
+    }
+
+    test("cleanup") {
+      serverPid.foreach(_.destroy())
+      pgContainer.stop()
+    }
+  }
+}