Test testParallelSlowLog() fails when run independently

[aditya-kumbhar]

The test uk.co.flax.luwak.matchers.TestParallelMatcher.testParallelSlowLog() inside ConcurrentMatcherTestBase.java fails if run independently.

I used the following command to run the test using mvn:
mvn test -Dtest=uk.co.flax.luwak.matchers.TestParallelMatcher#testParallelSlowLog -DfailIfNoTests=false

Failure log:

testParallelSlowLog(uk.co.flax.luwak.matchers.TestParallelMatcher)  Time elapsed: 0.714 sec  <<< FAILURE!
java.lang.AssertionError: 
Expecting:
 <"Limit: 0
	1 [256454792ns]
	2 [2220334ns]
	3 [256454500ns]
">
not to contain:
 <"2 ["> 
	at uk.co.flax.luwak.matchers.ConcurrentMatcherTestBase.testParallelSlowLog(ConcurrentMatcherTestBase.java:118)

The assertion that fails is:

assertThat(matches.getSlowLog().toString())
                .contains("1 [")
                .contains("3 [")
                .doesNotContain("2 [");

The test passes when the following change is made, calling getSlowLog() directly without using the matches object:

assertThat(monitor.match(batch, factory).getSlowLog().toString())
                .contains("1 [")
                .contains("3 [")
                .doesNotContain("2 [");

The change is small and does not affect the test logic, I am raising this issue to discuss if I can raise a PR for the fix and to get some feedback on any alternative approach for making the test work on its own.