Add regression tests for multithreaded ABM algs

Author: Michele Mesiti

lib/OrdinaryDiffEqAdamsBashforthMoulton/test/regression_test_threading.jl

@@ -0,0 +1,27 @@
+using OrdinaryDiffEqAdamsBashforthMoulton, ODEProblemLibrary
+using Test
+using Static
+
+free_timestep_algorithms = [ VCAB3, VCAB4, VCAB5, VCABM3, VCABM4, VCABM5, VCABM]
+
+fixed_timestep_algorithms = [AB3,AB4, AB5, ABM32, ABM43, ABM54]
+
+problem = ODEProblemLibrary.prob_ode_linear
+
+function test_alg(ALG; kwargs...)
+   sol_thread = solve(problem, ALG(Static.True()); kwargs...)
+   sol_nothread = solve(problem, ALG(Static.False()); kwargs...)
+
+   @test all(sol_nothread .== sol_thread)
+end
+
+
+@testset "Regression test for threading versions vs non threading versions" begin
+    @testset "$ALG" for ALG in fixed_timestep_algorithms
+        test_alg(ALG, dt=1//2^9)
+    end
+    @testset "$ALG" for ALG in free_timestep_algorithms
+        test_alg(ALG)
+    end
+
+end

lib/OrdinaryDiffEqAdamsBashforthMoulton/test/runtests.jl

@@ -2,3 +2,4 @@ using SafeTestsets
 
 @time @safetestset "ABM Convergence Tests" include("abm_convergence_tests.jl")
 @time @safetestset "Adams Variable Coefficients Tests" include("adams_tests.jl")
+@time @safetestset "Regression test for threading versions vs non threading versions"  include("regression_test_threading.jl")