remove no longer relevant test

Author: TorkelE

test/reactionsystem_core/reactionsystem.jl

@@ -770,21 +770,6 @@ let
 end
 
 # Fix for SBML test 305.
-let
-    @parameters k1 k2 S2 [isconstantspecies = true]
-    @species S1(t) S3(t)
-    rx = Reaction(k2, [S1], nothing)
-    ∂ₜ = default_time_deriv()
-    eq = ∂ₜ(S3) ~ k1 * S2
-    @mtkbuild osys = ODESystem([eq], t)
-    @named rs = ReactionSystem([rx, eq], t)
-    rs = complete(rs)
-    @test issetequal(unknowns(rs), [S1, S3])
-    @test issetequal(parameters(rs), [S2, k1, k2])
-    osys = convert(ODESystem, rs)
-    @test issetequal(unknowns(osys), [S1, S3])
-    @test issetequal(parameters(osys), [S2, k1, k2])
-end
 let
     @parameters k1 k2 S2 [isconstantspecies = true]
     @species S1(t) S3(t) [isbcspecies = true]