add k value

Author: TorkelE

test/miscellaneous_tests/symbolic_stoichiometry.jl

@@ -218,8 +218,8 @@ let
     end
 
     u0 = [:X => 8, :Y => 8]
-    ps_int = (:p => 1.0, :n1 => 3, :n2 => 4, :d => 0.1)
-    ps_dec = [:p => 1.0, :n1 => 0.5, :n2 => 2.5, :d => 0.1]
+    ps_int = (:p => 1.0, :k => 2.0, :n1 => 3, :n2 => 4, :d => 0.1)
+    ps_dec = [:p => 1.0, :k => 2.0, :n1 => 0.5, :n2 => 2.5, :d => 0.1]
     tspan = (0.0, 10.0)
 
     # Test ODE simulations with integer coefficients.