[Cython] Skip sensitivity-related tests when Sundials is not present

interfaces/cython/cantera/__init__.py

@@ -1,5 +1,5 @@
 from ._cantera import *
-from ._cantera import __version__
+from ._cantera import __version__, _have_sundials
 from .liquidvapor import *
 
 import os as _os

interfaces/cython/cantera/_cantera.pxd

@@ -426,6 +426,8 @@ cdef extern from "cantera/oneD/Sim1D.h":
 cdef extern from "wrappers.h":
     # config definitions
     cdef string get_cantera_version()
+    cdef int get_sundials_version()
+
     # ThermoPhase composition
     cdef void thermo_getMassFractions(CxxThermoPhase*, double*) except +
     cdef void thermo_setMassFractions(CxxThermoPhase*, double*) except +

interfaces/cython/cantera/test/test_reactor.py

@@ -1,4 +1,5 @@
 import numpy as np
+import unittest
 import re
 
 import cantera as ct
@@ -530,6 +531,8 @@ class TestWallKinetics(utilities.CanteraTest):
         self.assertArrayNear(C_left, C_right)
 
 
+@unittest.skipUnless(ct._have_sundials(),
+                     "Sensitivity calculations require Sundials")
 class TestReactorSensitivities(utilities.CanteraTest):
     def test_sensitivities1(self):
         net = ct.ReactorNet()

interfaces/cython/cantera/utils.pyx

@@ -19,4 +19,7 @@ cdef pystr(string x):
 def addDirectory(directory):
     CxxAddDirectory(stringify(directory))
 
+def _have_sundials():
+    return bool(get_sundials_version())
+
 __version__ = pystr(get_cantera_version())

interfaces/cython/cantera/wrappers.h

@@ -8,6 +8,11 @@ std::string get_cantera_version()
 	return std::string(CANTERA_VERSION);
 }
 
+int get_sundials_version()
+{
+	return SUNDIALS_VERSION;
+}
+
 // Function which populates a 1D array
 #define ARRAY_FUNC(PREFIX, CLASS_NAME, FUNC_NAME) \
     void PREFIX ## _ ## FUNC_NAME(Cantera::CLASS_NAME* object, double* data) \