mas-chen commented on code in PR #20:
URL: 
https://github.com/apache/flink-connector-kafka/pull/20#discussion_r1231663375


##########
flink-connector-kafka/src/test/java/org/apache/flink/connector/kafka/source/reader/KafkaPartitionSplitReaderTest.java:
##########
@@ -319,6 +321,51 @@ public void 
testUsingCommittedOffsetsWithEarliestOrLatestOffsetResetStrategy(
         
assertThat(reader.consumer().position(partition)).isEqualTo(expectedOffset);
     }
 
+    @Test
+    public void testConsumerClientRackSupplier() {
+        AtomicReference<Boolean> supplierCalled = new AtomicReference<>(false);
+        String rackId = "use1-az1";
+        Supplier<String> rackIdSupplier =
+                () -> {
+                    supplierCalled.set(true);
+                    return rackId;
+                };
+        Properties properties = new Properties();
+        createReader(
+                properties,
+                UnregisteredMetricsGroup.createSourceReaderMetricGroup(),
+                rackIdSupplier);
+        assertThat(supplierCalled.get()).isEqualTo(true);
+    }
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    public void testSetConsumerClientRackIgnoresNullAndEmpty(String rackId) {
+        Properties properties = new Properties();
+        Supplier<String> rackIdSupplier = () -> rackId;
+        KafkaPartitionSplitReader reader =
+                createReader(
+                        properties,
+                        
UnregisteredMetricsGroup.createSourceReaderMetricGroup(),
+                        rackIdSupplier);
+        reader.setConsumerClientRack(properties, rackIdSupplier);

Review Comment:
   You can expose a method @VisibleForTesting or use reflection?



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