fix the tests

Author: jClugstor

test/interface/ode_strip_test.jl

@@ -21,8 +21,8 @@ vern_sol = solve(prob, Vern7())
 end
 
 @testset "Rosenbrock Solution Stripping" begin
-    @test isnothing(SciMLBase.strip_solution(rosenbrock_sol).prob)
-    @test isnothing(SciMLBase.strip_solution(rosenbrock_sol).alg)
+    @test SciMLBase.strip_solution(rosenbrock_sol).prob.f isa SciMLBase.NullODEFunction
+    @test isnothing(SciMLBase.strip_solution(rosenbrock_sol, strip_alg = true).alg)
     @test isnothing(SciMLBase.strip_solution(rosenbrock_sol).interp.f)
     @test isnothing(SciMLBase.strip_solution(rosenbrock_sol).interp.cache.jac_config)
     @test isnothing(SciMLBase.strip_solution(rosenbrock_sol).interp.cache.grad_config)
@@ -31,8 +31,8 @@ end
 end
 
 @testset "TRBDF Solution Stripping" begin
-    @test isnothing(SciMLBase.strip_solution(TRBDF_sol).prob)
-    @test isnothing(SciMLBase.strip_solution(TRBDF_sol).alg)
+    @test SciMLBase.strip_solution(TRBDF_sol).prob.f isa SciMLBase.NullODEFunction
+    @test isnothing(SciMLBase.strip_solution(TRBDF_sol, strip_alg = true).alg)
     @test isnothing(SciMLBase.strip_solution(TRBDF_sol).interp.f)
     @test isnothing(SciMLBase.strip_solution(TRBDF_sol).interp.cache.nlsolver)
 end