Add unit test for erf and include math.h

aidge_export_cpp/kernels/erf.hpp

@@ -2,6 +2,7 @@
 #define __AIDGE_EXPORT_CPP_KERNELS_ERP__
 
 #include "network/typedefs.hpp"
+#include "math.h"
 
 template<int _NB_ELTS,
          typename Input_T, typename Output_T>

aidge_export_cpp/unit_tests/test_export.py

@@ -659,5 +659,14 @@ class test_operator_export(unittest.TestCase):
         initFiller(model)
         self.unit_test_export(model, "Conv", [[1, 1, 9, 9]])
 
+    def test_erf(self):
+        print("Erf")
+        model = aidge_core.sequential([
+            aidge_core.Erf(name="erf")
+        ])
+
+        self.unit_test_export(model, "Erf", [[1, 10]])
+
+
 if __name__ == '__main__':
     unittest.main()