Fix tests

Author: YingboMa

src/structural_transformation/symbolics_tearing.jl

@@ -37,7 +37,7 @@ end
 function full_equations(sys::AbstractSystem; simplify=false)
     empty_substitutions(sys) && return equations(sys)
     substitutions = get_substitutions(sys)
-    substitutions.subed_eqs === nothing && return substitutions.subed_eqs
+    substitutions.subed_eqs === nothing || return substitutions.subed_eqs
     @unpack subs = substitutions
     solved = Dict(eq.lhs => eq.rhs for eq in subs)
     neweqs = map(equations(sys)) do eq

src/structural_transformation/utils.jl

@@ -236,6 +236,7 @@ end
 
 function torn_system_jacobian_sparsity(sys)
     has_structure(sys) || return nothing
+    get_structure(sys) isa SystemStructure || return nothing
     s = structure(sys)
     @unpack fullvars, graph = s
 

test/odesystem.jl

@@ -220,6 +220,8 @@ for p in [prob1, prob14]
 end
 prob2 = ODEProblem(sys,u0,tspan,p,jac=true)
 prob3 = ODEProblem(sys,u0,tspan,p,jac=true,sparse=true)
+@test prob3.f.jac_prototype isa SparseMatrixCSC
+prob3 = ODEProblem(sys,u0,tspan,p,jac=true,sparsity=true)
 @test prob3.f.sparsity isa SparseMatrixCSC
 @test_throws ArgumentError ODEProblem(sys,zeros(5),tspan,p)
 for (prob, atol) in [(prob1, 1e-12), (prob2, 1e-12), (prob3, 1e-12)]