some Junit Tests report negative test time

```
name="test004_classExtends - 17" time="-1.701317522017E9" />
name="test005_classTypeParameterBound - 17" time="-1.701317522033E9" />
name="test001a_classTypeParameterDifferingRetentions - 17" time="-1.701317521986E9" />
name="test001_classTypeParameter - 17" time="-1.701317521986E9" />
name="test009_methodReceiver - 11" time="-1.701317315669E9" />
name="test011_throws - 11" time="-1.701317315684E9" />
name="testBug548596 - 11" time="-1.7013173157E9" />
name="test004_classExtends - 11" time="-1.701317315622E9" />
name="test007_field - 11" time="-1.701317315653E9" />
name="test012_annotationMethodReturn - 17" time="-1.701317522095E9" />
name="test009_methodReceiver - 17" time="-1.701317522064E9" />
name="test012_annotationMethodReturn - 11" time="-1.7013173157E9" />
name="test006_methodTypeParameterBound - 11" time="-1.701317315637E9" />
name="test003_classExtends - 11" time="-1.701317315622E9" />
name="test007_field - 17" time="-1.701317522048E9" />
name="test001_classTypeParameter - 11" time="-1.701317315591E9" />
name="test011_throws - 17" time="-1.701317522095E9" />
name="test001a_classTypeParameterDifferingRetentions - 11" time="-1.701317315591E9" />
name="test008_methodReturn - 11" time="-1.701317315669E9" />
name="test010_methodFormalParameter - 17" time="-1.70131752208E9" />
name="test006_methodTypeParameterBound - 17" time="-1.701317522033E9" />
name="testBug548596 - 17" time="-1.701317522111E9" />
name="test005_classTypeParameterBound - 11" time="-1.701317315637E9" />
name="test003_classExtends - 17" time="-1.701317522017E9" />
name="test010_methodFormalParameter - 11" time="-1.701317315684E9" />
name="test008_methodReturn - 17" time="-1.701317522064E9" />
name="test002_methodTypeParameter - 17" time="-1.701317522002E9" />
name="test002_methodTypeParameter - 11" time="-1.701317315606E9" />
```

Start by locating the JUnit XML reporting path and the tests named in the reported output, then inspect how their elapsed times are produced. Reproduce the negative values and trace the timing data through report generation. Done means the affected tests no longer report negative durations and a regression test covers the case.

Written by the indexing model from the issue text.