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./gradlew -PmaxTestRetries=10 :clients:test --tests "*KafkaConsumerTest*"

With KAFKA-17433, a new custom Gradle property was added that lets us repeat integration tests. This is primarily intended for use in the "deflake" action (documented below), but can also be used locally.

./gradlew -Pkafka.cluster.test.repeat=2 :core:test --tests *ZkMigrationIntegrationTest*

IntelliJ IDEA

Some times, running the tests repeatedly with Gradle does not produce enough load on the system to expose the flakiness. If you are using IntelliJ IDEA, there is an option to run a single test N times or until failure. To enable this, first modify IntelliJ to run the tests directly rather than calling out to Gradle

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There is a special "deflake" action on GitHub that allows us to run a single integration test repeatedly. Currently, it only supports tests written using the ClusterTestExtensions (i.e., @ClusterTest , @ClusterTests , and @ClusterTemplate ). It combines Gradle test selectors "--tests" with a custom the new property added in KAFKA-17433. See the Gradle docs on test filtering for valid patterns https://docs.gradle.org/current/userguide/java_testing.html#simple_name_pattern. 

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