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Add test to reproduce callback lifetime error #281

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Add test to reproduce callback lifetime error #281

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20 changes: 20 additions & 0 deletions python/tests/test_scip.py
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Original file line number Diff line number Diff line change
Expand Up @@ -154,3 +154,23 @@ def test_is_solved(model):

def test_bounds(model):
assert model.dual_bound < model.primal_bound


@requires_pyscipopt
def test_pyscipopt_callback(model):
"""GIL is properly reaquired in PySCIPOpt and PySCIPOpt model liftime is managed."""
import pyscipopt.scip

class EventHandler(pyscipopt.scip.Eventhdlr):
def eventinit(self):
self.model.catchEvent(scip.SCIP_EVENTTYPE.LPEVENT, self)

def eventexit(self):
self.model.dropEvent(scip.SCIP_EVENTTYPE.LPEVENT, self)

def eventexec(self, event):
# Use the pyscipopt object to verify its lifetime
self.model.getNTotalNodes()

model.as_pyscipopt().includeEventhdlr(EventHandler(), "Name", "Description")
model.solve()