chore: import upstream snapshot with attribution

tests/fixtures/sample.scala

@@ -0,0 +1,29 @@
+import scala.collection.mutable.ListBuffer
+
+case class Config(baseUrl: String, timeout: Int)
+
+trait Loggable
+abstract class BaseClient
+
+class HttpClient(config: Config) extends BaseClient with Loggable {
+  val source: Config = config
+  var fallback: BaseClient = null
+
+  def get(path: String): String = {
+    buildRequest("GET", path)
+  }
+
+  def post(path: String, body: String): String = {
+    buildRequest("POST", path)
+  }
+
+  private def buildRequest(method: String, path: String): String = {
+    s"$method ${config.baseUrl}$path"
+  }
+}
+
+object HttpClientFactory {
+  def create(baseUrl: String): HttpClient = {
+    new HttpClient(Config(baseUrl, 30))
+  }
+}