LadyForest commented on code in PR #24390:
URL: https://github.com/apache/flink/pull/24390#discussion_r1521195360


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flink-connectors/flink-connector-files/src/test/java/org/apache/flink/connector/file/table/FileSystemOutputFormatTest.java:
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@@ -37,24 +39,44 @@
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
+import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
-import java.util.TreeMap;
-import java.util.concurrent.atomic.AtomicReference;
+import java.util.UUID;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.entry;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 /** Test for {@link FileSystemOutputFormat}. */
 class FileSystemOutputFormatTest {
 
-    @TempDir private java.nio.file.Path tmpPath;
     @TempDir private java.nio.file.Path outputPath;
 
+    @TempDir private java.nio.file.Path stagingBaseDir;
+
+    private java.nio.file.Path stagingPath;

Review Comment:
   The reason to introduce both`stagingBaseDir` and `stagingPath` is that 
   
   1. We cannot directly use `@TempDir` to annotate `stagingPath`. Junit5 will 
automatically create a temp directory, and thus the test will fail at 
`Preconditions.checkState`.
   
   2. The reason to introduce `@TempDir stagingBaseDir`(rather than reuse 
`outputPath`) is to decouple the test logic.



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