Strange issue in testing a package using Symbolics.jl

General Usage
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1

I am going through a weird issue when writing a testset for a part of RigorousInvariantMeasures.jl that uses Symbolics.jl.
I start the testset by using Symbolics, then call @variables z
and when I run the tests Julia complains saying that @variables is not defined.

Minimal problematic code:

@testset "Test Symbolic code" begin
    using Symbolics
    @variables z
end
2

Probably because it’s trying to expand the macro before anything happens i.e. at compile time, but the macro is not loaded yet.

3

I understand, it makes sense, thank you.

Do you have any idea on how I could make this code work?

I tried by calling

Symbolics.@variables z

but, supporting your theses, then Julia states that Symbolics is unknown, i.e.,
it seems it tries to run the macro before using the package.

4

Just put using Symbolics outside of the test set - macros will always be expanded before anything is run.

If you want to make using Symbolics only apply in that test set, look into SafeTestsets.jl

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