Similar to
request #15124.
The class \UGroupManager is used with a incorrect case in one of the docman test, depending on the execution order the test suite can fail.
There were 30 errors:
1) UGroupManagerGetUGroupWithMembersTest::testItReturnsAUGroupWithMembers
Mockery\Exception\BadMethodCallException: Method Mockery_65_UgroupManager::getUGroupWithMembers() does not exist on this mock object
/tuleap/tests/unit/common/Project/UGroupManagerGetUGroupWithMembersTest.php:46
2) UGroupManagerGetUGroupTest::testItReturnsStaticUgroupForAGivenProject
Error: Call to undefined method UgroupManager::getUGroup()
/tuleap/tests/unit/common/Project/UGroupManagerGetUGroupTest.php:71
3) UGroupManagerGetUGroupTest::testItExcludesGivenUgroups
Error: Call to undefined method UgroupManager::getUGroups()
/tuleap/tests/unit/common/Project/UGroupManagerGetUGroupTest.php:89
4) UGroupManagerGetUGroupTest::testItReturnsAStaticUGroupOfAProject
Error: Call to undefined method UgroupManager::getUGroupByName()
/tuleap/tests/unit/common/Project/UGroupManagerGetUGroupTest.php:95
[...]