Ling Mao created CASSANDRA-20474:
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Summary: Ant supports repeatedly running a unit test multiple
times.
Key: CASSANDRA-20474
URL: https://issues.apache.org/jira/browse/CASSANDRA-20474
Project: Apache Cassandra
Issue Type: New Feature
Components: Test/unit
Reporter: Ling Mao
As inspired by this insightful blog [1], consider a scenario where we have a
command like:
{code:java}
ant test-iteration
-Dtest.name=org.apache.cassandra.service.StorageServiceServerTest
-Dtest.iters=5{code}
This command enables running a specific test multiple times using the
-Dtest.iters parameter. When combined with "{*}_stress-ng_{*}", reproducing
flaky tests becomes significantly easier. However, implementing this feature is
challenging due to Ant properties being immutable. Below are three potential
solutions:
{_}*Solution A*{_}:
Create a temporary directory to track iterations and sequentially call ant
testsome-single via a bash script. The drawback is that it cannot execute all
test cases within the same JVM.
{code:java}
<exec executable="mktemp" outputproperty="temp.iter.file">
<arg value="-p"/>
<arg value="/tmp"/>
<arg value="test_iters_XXXXXX"/>
</exec>
<echo message="Generated temp file: ${temp.iter.file}"/>
<echo file="${temp.iter.file}" message="0"/>
<exec executable="bash" failonerror="true">
<arg value="-c"/>
<arg value='
while [ $(cat ${temp.iter.file}) -lt ${test.iters} ]; do
ant testsome-single -Dtest.name=${test.name}
-Dtest.methods=${test.methods};
echo $(($(cat ${temp.iter.file}) + 1)) > ${temp.iter.file};
done
'/>
</exec>{code}
{_}*Solution B*{_}:
Similar to the approach in a particular PR, rely on JavaScript for iteration
logic. But this solution is no longer viable since JDK 15 removed the Nashorn
engine.
{_}*Solution C*{_}:
Introduce external dependencies such as Ant-Contrib or Groovy scripts. For
instance, Apache Lucene utilized Groovy scripts [2] when building with Ant, and
this approach is preferred.
I welcome insights from others to further advance this work.
References:
[1] https://www.elastic.co/search-labs/blog/lucene-corrupted-index-exception
[2] https://issues.apache.org/jira/secure/attachment/12660852/LUCENE-5881.patch
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