jlprat commented on a change in pull request #11241:
URL: https://github.com/apache/kafka/pull/11241#discussion_r695019986
##########
File path:
streams/src/test/java/org/apache/kafka/streams/kstream/internals/KStreamFlatMapTest.java
##########
@@ -86,4 +88,12 @@ public void testFlatMap() {
assertEquals(expected[i],
supplier.theCapturedProcessor().processed().get(i));
}
}
+
+ @Test
+ public void testKeyValueMapperResultNotNull() {
+ final KStreamFlatMap<String, Integer, String, Integer> supplier = new
KStreamFlatMap<>((key, value) -> null);
+ final Record<String, Integer> record = new Record<>("K", 0, 0L);
+ assertThrows(String.format("KeyValueMapper can't return null from
mapping the record: %s", record),
+ NullPointerException.class, () ->
supplier.get().process(record));
Review comment:
Just copying over the suggestion to here, so it's easy to find
```suggestion
final Throwable throwable = assertThrows(NullPointerException.class,
() -> supplier.get().process(record));
assertEquals(throwable.getMessage(), String.format("KeyValueMapper
can't return null from mapping the record: %s", record));
```
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