When unit testing, how do I test that a function returns nothing when called in void context?

For example, I can easily test if the following function returns a list or a scalar containing 'value'. But as soon as I test its return value, I am no longer calling the function in void context.

sub context {
    return unless defined wantarray;
    return wantarray ? ('value') : 'value';
}

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Thanks, and sorry if this is a dumb question!

In reply to Unit testing, context and wantarray by mikeman

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