test: fix tests

Author: AayushSabharwal

test/components.jl

@@ -98,7 +98,7 @@ let
         [resistor, resistor2, capacitor, source, ground])
     sys2 = structural_simplify(rc_model2)
     prob2 = ODEProblem(sys2, u0, (0, 10.0))
-    sol2 = solve(prob2, Tsit5())
+    sol2 = solve(prob2, Rosenbrock23())
     @test sol2[source.p.i] ≈ sol2[rc_model2.source.p.i] ≈ -sol2[capacitor.i]
 end
 

test/state_selection.jl

@@ -196,7 +196,7 @@ let
     prob1 = ODEProblem(sys, u0, (0.0, 0.1))
     prob2 = ODEProblem(sys, u0, (0.0, 0.1))
     @test solve(prob1, FBDF()).retcode == ReturnCode.Success
-    @test_broken solve(prob2, FBDF()).retcode == ReturnCode.Success
+    @test solve(prob2, FBDF()).retcode == ReturnCode.Success
 end
 
 let

test/structural_transformation/tearing.jl

@@ -156,35 +156,35 @@ newdaesys = structural_simplify(daesys)
 @test equations(tearing_substitution(newdaesys)) == [D(x) ~ z; 0 ~ x + sin(z) - p * t]
 @test isequal(unknowns(newdaesys), [x, z])
 @test isequal(states(newdaesys), [x, z])
-@test_deprecated ODAEProblem(newdaesys, [x => 1.0], (0, 1.0), [p => 0.2])
-prob = ODEProblem(newdaesys, [x => 1.0], (0, 1.0), [p => 0.2])
-du = [0.0];
-u = [1.0];
+@test_deprecated ODAEProblem(newdaesys, [x => 1.0, z => -0.5π], (0, 1.0), [p => 0.2])
+prob = ODEProblem(newdaesys, [x => 1.0, z => -0.5π], (0, 1.0), [p => 0.2])
+du = [0.0, 0.0];
+u = [1.0, -0.5π];
 pr = 0.2;
 tt = 0.1;
 @test_skip (@ballocated $(prob.f)($du, $u, $pr, $tt)) == 0
 prob.f(du, u, pr, tt)
-@test du≈[-asin(u[1] - pr * tt)] atol=1e-5
+@test du ≈ [u[2], u[1] + sin(u[2]) - pr * tt] atol=1e-5
 
 # test the initial guess is respected
 @named sys = ODESystem(eqs, t, defaults = Dict(z => Inf))
 infprob = ODEProblem(structural_simplify(sys), [x => 1.0], (0, 1.0), [p => 0.2])
-@test_throws Any infprob.f(du, u, pr, tt)
+@test_throws Any infprob.f(du, infprob.u0, pr, tt)
 
-sol1 = solve(prob, Tsit5())
+sol1 = solve(prob, RosShamp4(), reltol=8e-7)
 sol2 = solve(ODEProblem{false}((u, p, t) -> [-asin(u[1] - pr * t)],
         [1.0],
         (0, 1.0),
         0.2), Tsit5(), tstops = sol1.t, adaptive = false)
-@test Array(sol1)≈Array(sol2) atol=1e-5
+@test Array(sol1[x])≈Array(sol2[1, :]) atol=1e-5
 
 @test sol1[x] == first.(sol1.u)
 @test sol1[y] == first.(sol1.u)
-@test sin.(sol1[z]) .+ sol1[y]≈pr[1] * sol1.t atol=1e-5
+@test sin.(sol1[z]) .+ sol1[y]≈pr[1] * sol1.t atol=5e-5
 @test sol1[sin(z) + y]≈sin.(sol1[z]) .+ sol1[y] rtol=1e-12
 
 @test sol1[y, :] == sol1[x, :]
-@test (@. sin(sol1[z, :]) + sol1[y, :])≈pr * sol1.t atol=1e-5
+@test (@. sin(sol1[z, :]) + sol1[y, :])≈pr * sol1.t atol=5e-5
 
 # 1426
 function Translational_Mass(; name, m = 1.0)