create workdir if it does not exist

build.sbt

@@ -17,7 +17,6 @@ libraryDependencies ++= Seq(
   "org.scalatest" %% "scalatest" % "3.0.0" % "test",
   "com.amazonaws" % "aws-java-sdk-s3" % "1.11.29" % "test",
   "com.typesafe.akka" %% "akka-stream-testkit" % akkaVersion % "test",
-  //"com.typesafe.akka" %% "akka-slf4j" % akkaVersion,
   "commons-io" % "commons-io" % "2.5" % "test",
   "ch.qos.logback" % "logback-classic" % "1.1.7" % "test"
 )

src/main/scala/io/findify/s3mock/provider/FileProvider.scala

@@ -15,6 +15,9 @@ import scala.util.Random
   * Created by shutty on 8/9/16.
   */
 class FileProvider(dir:String) extends Provider with LazyLogging {
+  val workDir = File(dir)
+  if (!workDir.exists) workDir.createDirectories()
+
   def listBuckets: ListAllMyBuckets = {
     val buckets = File(dir).list.map(f => Bucket(f.name, DateTime(f.lastModifiedTime.toEpochMilli))).toList
     logger.debug(s"listing buckets: ${buckets.map(_.name)}")

src/test/scala/io/findify/s3mock/ListBucketEmptyWorkdirTest.scala

@@ -0,0 +1,37 @@
+package io.findify.s3mock
+
+import java.util.UUID
+
+import scala.collection.JavaConverters._
+import com.amazonaws.auth.BasicAWSCredentials
+import com.amazonaws.services.s3.AmazonS3Client
+import io.findify.s3mock.provider.FileProvider
+import org.scalatest.{BeforeAndAfterAll, FlatSpec, Matchers}
+
+/**
+  * Created by shutty on 8/30/16.
+  */
+class ListBucketEmptyWorkdirTest extends FlatSpec with Matchers with BeforeAndAfterAll {
+  lazy val s3 = new AmazonS3Client(new BasicAWSCredentials("hello", "world"))
+
+  val workDir = s"/tmp/${UUID.randomUUID()}"
+  lazy val server = new S3Mock(8001, new FileProvider(workDir))
+
+  override def beforeAll = {
+    s3.setEndpoint("http://127.0.0.1:8001")
+    server.start
+  }
+  override def afterAll = {
+    server.stop
+  }
+
+  "s3mock" should "list bucket with empty prefix" in {
+    s3.createBucket("list")
+    s3.putObject("list", "foo1", "xxx")
+    s3.putObject("list", "foo2", "xxx")
+    val list = s3.listObjects("list").getObjectSummaries.asScala.toList
+    list.map(_.getKey).forall(_.startsWith("/foo")) shouldBe true
+  }
+
+
+}