diff --git a/sql/core/src/test/scala/org/apache/spark/sql/streaming/FileStreamSourceSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/streaming/FileStreamSourceSuite.scala
index aabdccaaf319de11ff1d5a72d67451cd51fb03aa..b9e9da9a1ec53f64a06aa4ec3b23b1a71bc626a6 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/streaming/FileStreamSourceSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/streaming/FileStreamSourceSuite.scala
@@ -664,7 +664,9 @@ class FileStreamSourceSuite extends FileStreamSourceTest {
     def createFile(content: String, src: File, tmp: File): Unit = {
       val tempFile = Utils.tempFileWith(new File(tmp, "text"))
       val finalFile = new File(src, tempFile.getName)
-      src.mkdirs()
+      require(!src.exists(), s"$src exists, dir: ${src.isDirectory}, file: ${src.isFile}")
+      require(src.mkdirs(), s"Cannot create $src")
+      require(src.isDirectory(), s"$src is not a directory")
       require(stringToFile(tempFile, content).renameTo(finalFile))
     }