Test detection faces a bug in the lang63 example, because of the following test cases:

org.apache.commons.lang.enum.EnumTest
org.apache.commons.lang.enum.EnumUtilsTest
org.apache.commons.lang.enum.ValuedEnumTest

The issue is that the fully qualified names passed to test-runner, for these classes, are actually just the class name itself:

[EnumTest, EnumUtilsTest, ValuedEnumTest, org.apache.commons.lang.ArrayUtilsAddTest, org.apache.commons.lang.ArrayUtilsRemoveTest, org.apache.commons.lang.ArrayUtilsTest, org.apache.commons.lang.BitFieldTest, org.apache.commons.lang.BooleanUtilsTest, org.apache.commons.lang.CharEncodingTest, org.apache.commons.lang.CharRangeTest, ...

My working hypothesis is that this issue comes from Spoon not handling a package name with the keyword enum well.