TST: Add check for throwing exception inside RHS

packages/scikits-odes-sundials/src/scikits_odes_sundials/cvode.pyx

@@ -1,5 +1,5 @@
 # cython: embedsignature=True
-from cpython.exc cimport PyErr_CheckSignals
+from cpython.exc cimport PyErr_CheckSignals, PyErr_Occurred
 from collections import namedtuple
 from enum import IntEnum
 import inspect
@@ -1877,6 +1877,9 @@ cdef class CVODE(BaseSundialsSolver):
 
         while True:
             flag = CVode(cv_mem, <sunrealtype> t,  y, &t_out, CV_NORMAL)
+            if PyErr_Occurred() != NULL:
+                # This basically reraises the exception
+                return NULL
 
             nv_s2ndarray(y,  y_last)
 

packages/scikits-odes/src/scikits/odes/tests/test_error_handling.py

@@ -0,0 +1,40 @@
+# Authors: B. Malengier, russel (scipy trac)
+"""
+Tests for differential algebraic equation solvers.
+Here we test onroot and ontstop
+"""
+import numpy as np
+
+from scikits.odes import ode
+from scikits.odes.sundials.cvode import StatusEnum
+from scikits.odes.sundials.common_defs import DTYPE
+
+#data
+g  = 9.81    # gravitational constant
+
+Y0 = 1000.0  # Initial height
+Y1 = 10.0    # Bottom height - when reached, changes to Y0 (teleport)
+T1 = 10.0    # stop time
+v0 = 0.0     # Initial speed
+
+#initial data at t=0, y[0] = Y, y[1] = \dot{Y}
+y0 = [Y0, v0]
+t_end1 =  10.0 # Time of free fall for experiments 1,2
+t_end2 = 100.0 # Time of free fall for experiments 3,4
+
+atol = 1e-4
+rtol = 1e-4
+
+
+def rhs_fn_except(t, y, ydot):
+    """ rhs equations for the problem """
+    if t > 5:
+        raise Exception("We can't go above t = 10")
+    ydot[0] = y[1]
+    ydot[1] = -g
+
+def test_cvode_rhs_exception():
+    #test calling sequence. End is reached before root is found
+    tspan = np.arange(0, t_end1 + 1, 1.0, DTYPE)
+    solver = ode('cvode', rhs_fn_except, old_api=False)
+    soln = solver.solve(tspan, y0)