jasonyanwenl commented on a change in pull request #11241:
URL: https://github.com/apache/kafka/pull/11241#discussion_r695002209
##########
File path:
streams/src/test/java/org/apache/kafka/streams/kstream/internals/KStreamFlatMapTest.java
##########
@@ -86,4 +88,10 @@ 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);
+ assertThrows(NullPointerException.class, () ->
supplier.get().process(new Record<>("K", 0, 0L)));
Review comment:
Thanks for your review! I found we mixed the using of two packages:
`org.junit.Assert` and `org.junit.jupiter.api.Assertions`. The method
`asssertThrows` in those two packages have different api:
For `org.junit.Assert.assertThrows`, the
[api](https://junit.org/junit4/javadoc/4.13/org/junit/Assert.html#assertThrows(java.lang.String,%20java.lang.Class,%20org.junit.function.ThrowingRunnable))
is:
```java
public static <T extends Throwable> T assertThrows(String message,
Class<T>
expectedThrowable,
ThrowingRunnable runnable)
```
For `org.junit.jupiter.api.Assertions.assertThrows`, the
[api](https://junit.org/junit5/docs/5.0.1/api/org/junit/jupiter/api/Assertions.html#assertThrows-java.lang.Class-org.junit.jupiter.api.function.Executable-java.lang.String-)
is:
```java
public static <T extends Throwable> T assertThrows(Class<T> expectedType,
Executable executable,
String message)
```
I searched our Kafka code base and found there is [another
place](https://github.com/apache/kafka/blob/9565a529e08d7aa36beac02c8e6115bcc87d2dc7/streams/src/test/java/org/apache/kafka/streams/processor/internals/ProcessorStateManagerTest.java#L521)
using the package `org.junit.Assert.assertThrows` to assert exception message
so I follow that to use the same api as well here.
Please let me know if this is not proper.
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