Merge pull request #99 from SKopecz/stuff

fix error message in test_convergence without analytical solution

Author: ChrisRackauckas

src/convergence.jl

@@ -14,8 +14,8 @@ function ConvergenceSimulation(solutions, convergence_axis;
     uEltype = eltype(solutions[1].u[1])
     errors = Dict() #Should add type information
     if expected_value == nothing
-        if isempty(solutions[1].errors)
-            error("Errors dictionary is empty. No analytical solution set.")
+        if isnothing(solutions[1].errors) || isempty(solutions[1].errors)
+            error("Errors dictionary is empty. No analytical solution set. If you used `test_convergence` you may consider `analyticless_test_convergence` instead.")
         end
         for k in keys(solutions[1].errors)
             errors[k] = [mean(sol.errors[k]) for sol in solutions]

test/analyticless_convergence_tests.jl

@@ -14,6 +14,10 @@ test_setup = Dict(:alg => Vern9(), :reltol => 1e-25, :abstol => 1e-25)
 sim1 = analyticless_test_convergence(dts, prob, Tsit5(), test_setup)
 sim2 = analyticless_test_convergence(dts, prob, Vern9(), test_setup)
 
+if VERSION >= v"1.8"
+    @test_throws "No analytical solution set." test_convergence(dts, prob, Tsit5())
+end
+
 @test abs(sim1.𝒪est[:final] - 5) < 0.2
 @test abs(sim2.𝒪est[:final] - 9) < 0.2