add test for initial cs/amounts

test/loadmodels.jl

@@ -68,3 +68,12 @@ end
     m = readSBML(joinpath(@__DIR__, "data", "sbml00852.xml"))
     @test all(contains_time.(r.kinetic_math for (_, r) in m.reactions))
 end
+
+@testset "Initial amounts and concentrations" begin
+    m = readSBML(joinpath(@__DIR__, "data", "sbml00852.xml"))
+
+    @test all(isnothing.(SBML.initial_concentrations(m)))
+    @test length(SBML.initial_amounts(m)) == 4
+    @test sum(SBML.initial_amounts(m)) == 0.001
+    @test sum(SBML.initial_concentrations(m, convert_amounts = true)) == 0.001
+end