soarez commented on a change in pull request #9000:
URL: https://github.com/apache/kafka/pull/9000#discussion_r466080451
##########
File path:
streams/src/test/java/org/apache/kafka/streams/kstream/internals/KStreamImplTest.java
##########
@@ -1865,6 +1865,17 @@ public void
shouldNotAllowNullNamedOnTransformWithStoreName() {
assertThat(exception.getMessage(), equalTo("named can't be null"));
}
+ @Test
+ public void shouldNotAllowBadTransformerSupplierOnFlatTransform() {
Review comment:
The "Value" variants use a `ValueTransformerSupplier` instead of a
`TransformerSupplier`. Does it makes sense to extend the supplier usage
verification to `ValueTransformerSupplier` as well?
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