Added explicit time-dependence to failing test cases.

Author: lamorton

test/lowering_solving.jl

@@ -48,7 +48,7 @@ eqs = [D(x) ~ σ*(y-x),
 lorenz1 = ODESystem(eqs,name=:lorenz1)
 lorenz2 = ODESystem(eqs,name=:lorenz2)
 
-@variables α
+@variables α(t)
 @parameters γ
 connections = [0 ~ lorenz1.x + lorenz2.y + α*γ]
 connected = ODESystem(connections,t,[α],[γ],systems=[lorenz1,lorenz2])

test/reactionsystem.jl

@@ -189,7 +189,7 @@ end
 
 # test for https://github.com/SciML/ModelingToolkit.jl/issues/436
 @parameters t
-@variables S I
+@variables S(t) I(t)
 rxs = [Reaction(1,[S],[I]), Reaction(1.1,[S],[I])]
 rs = ReactionSystem(rxs, t, [S,I], [])
 js = convert(JumpSystem, rs)
@@ -202,7 +202,7 @@ jprob = JumpProblem(rs, dprob, Direct(), save_positions=(false,false))
 
 
 @parameters k1 k2
-@variables R
+@variables R(t)
 rxs = [Reaction(k1*S, [S,I], [I], [2,3], [2]),
        Reaction(k2*R, [I], [R]) ]
 rs = ReactionSystem(rxs, t, [S,I,R], [k1,k2])