XComp commented on a change in pull request #17972:
URL: https://github.com/apache/flink/pull/17972#discussion_r760120601



##########
File path: 
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/environment/CheckpointConfigFromConfigurationTest.java
##########
@@ -90,7 +97,81 @@
                         .whenSetFromFile("execution.checkpointing.unaligned", 
"true")
                         
.viaSetter(CheckpointConfig::enableUnalignedCheckpoints)
                         
.getterVia(CheckpointConfig::isUnalignedCheckpointsEnabled)
-                        .nonDefaultValue(true));
+                        .nonDefaultValue(true),
+                TestSpec.testValue(
+                                (CheckpointStorage)
+                                        new FileSystemCheckpointStorage(
+                                                
"file:///path/to/checkpoint/dir"))
+                        .whenSetFromFile("state.checkpoints.dir", 
"file:///path/to/checkpoint/dir")
+                        .viaSetter(CheckpointConfig::setCheckpointStorage)
+                        .getterVia(CheckpointConfig::getCheckpointStorage)
+                        .nonDefaultValue(
+                                new 
FileSystemCheckpointStorage("file:///path/to/checkpoint/dir"))

Review comment:
       There is no default value for `CheckpointStorage`. The 
`testNotOverridingIfNotSet` test verifies that the defined non-default value is 
still set after `configure` is called on an `Configuration` instance without 
any set values.




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