dom testing with jsdom

..but had to go without modules scala-js/scala-js-env-jsdom-nodejs#56

build.sbt

@@ -1,24 +1,16 @@
-import org.scalajs.linker.interface.ModuleSplitStyle
+import org.scalajs.linker.interface.ModuleSplitStyle.*
 
 lazy val sueppchen = project.in(file("."))
-  .enablePlugins(ScalaJSPlugin) // Enable the Scala.js plugin in this project
-  .settings(
-    scalaVersion := "3.2.2",
+    .enablePlugins(ScalaJSPlugin) // Enable the Scala.js plugin in this project
+    .settings(
+        scalaVersion := "3.2.2",
+        libraryDependencies += "com.raquo" %%% "laminar" % "15.0.1",
 
-    scalaJSUseMainModuleInitializer := true,
+        scalaJSUseMainModuleInitializer := true,
+        scalaJSLinkerConfig ~= { _.withModuleKind(ModuleKind.ESModule)
+                                  .withModuleSplitStyle(SmallModulesFor(List("sueppchen"))) },
 
-    /* Configure Scala.js to emit modules in the optimal way to
-     * connect to Vite's incremental reload.
-     * - emit as many small modules as possible for classes in the "sueppchen" package
-     * - emit as few (large) modules as possible for all other classes
-     */
-    scalaJSLinkerConfig ~= {
-      _.withModuleKind(ModuleKind.ESModule)
-        .withModuleSplitStyle(
-          ModuleSplitStyle.SmallModulesFor(List("sueppchen")))
-    },
-
-    libraryDependencies += "com.raquo" %%% "laminar" % "15.0.1",
-
-
-  )
+        libraryDependencies += "org.scalatest" %%% "scalatest" % "3.2.16" % "test",
+        Test / jsEnv := new org.scalajs.jsenv.jsdomnodejs.JSDOMNodeJSEnv(),
+        Test / scalaJSLinkerConfig ~= { _.withModuleKind(ModuleKind.NoModule).withModuleSplitStyle(FewestModules) },
+    )