fix iis and test

Author: Joao-Dionisio

CHANGELOG.md

@@ -6,6 +6,7 @@
 ### Fixed
 - all fundamental callbacks now raise an error if not implemented
 - Fixed the type of MatrixExpr.sum(axis=...) result from MatrixVariable to MatrixExpr.
+- Updated IIS result in PyiisfinderExec()
 ### Changed
 - changed default value of enablepricing flag to True
 ### Removed

src/pyscipopt/iisfinder.pxi

@@ -33,4 +33,5 @@ cdef SCIP_RETCODE PyiisfinderExec (SCIP_IIS* iis, SCIP_IISFINDER* iisfinder, SCI
     PyIIS.iis._iis = iis
     result_dict = PyIIS.iisfinderexec()
     assert isinstance(result_dict, dict), "iisfinderexec() must return a dictionary."
+    result[0] = result_dict.get("result", <SCIP_RESULT>result[0])
     return SCIP_OKAY

tests/test_iis.py

@@ -76,9 +76,7 @@ def test_iisGreddyMakeIrreducible():
     m.includeIISfinder(my_iis, "", "", priority=10000)
 
     iis = m.generateIIS()
-    with pytest.raises(AssertionError):
-        assert not iis.isSubscipIrreducible() # this should not fail
-
+    assert not iis.isSubscipIrreducible()
     assert iis.isSubscipInfeasible()
 
     iis.greedyMakeIrreducible()