To reduce the chance of flaky test failure

[java-codehunger]

Description: This test is flakily fails. I run this test many times and it makes assertion fails. The failure message is as follows.

Failure:

[ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.51 s <<< FAILURE! - in nl.nlighten.prometheus.tomcat.TomcatServletMetricsFilterTest [ERROR] testServletRequestMetrics(nl.nlighten.prometheus.tomcat.TomcatServletMetricsFilterTest) Time elapsed: 0.01 s <<< FAILURE!
java.lang.AssertionError: Expected: is a value greater than <0.0> but: <0.0> was equal to <0.0> at nl.nlighten.prometheus.tomcat.TomcatServletMetricsFilterTest.testServletRequestMetrics(TomcatServletMetricsFilterTest.java:31)

[ERROR] Failures: [ERROR] TomcatServletMetricsFilterTest.testServletRequestMetrics:31 Expected: is a value greater than <0.0> but: <0.0> was equal to <0.0> [INFO] [ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0