Add test

SciML · Oct 19, 2022 · a5c5b8f · a5c5b8f
1 parent 4ee1990
commit a5c5b8f
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/test/reduction.jl b/test/reduction.jl
@@ -295,3 +295,10 @@ eqs = [x ~ 0
 ss = alias_elimination(sys)
 @test isempty(equations(ss))
 @test sort(observed(ss), by = string) == ([D(x), x, y] .~ 0)
+
+eqs = [D(D(x)) ~ -x]
+@named sys = ODESystem(eqs, t, [x], [])
+ss = alias_elimination(sys)
+@test length(equations(ss)) == length(states(ss)) == 1
+ss = structural_simplify(sys)
+@test length(equations(ss)) == length(states(ss)) == 2