Add missing import to tests/__init__.py.
Add missing import to tests/__init__.py.


Former-commit-id: 6402a06465bc4202d1b9bc389d82a6ec985f5dcb [formerly bcffcb1fb0b7f8741b6ca9c5c14ce1a64772e5ac]
Former-commit-id: 515d38212eb69714abcbf6a69c9a6317f097540e
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine