prevent example-config generating in test builds

Signed-off-by: Jason Volk <jason@zemos.net>

src/macros/utils.rs

@@ -32,6 +32,8 @@ pub(crate) fn is_cargo_build() -> bool {
 		.is_some()
 }
 
+pub(crate) fn is_cargo_test() -> bool { std::env::args().any(|flag| flag == "--test") }
+
 pub(crate) fn get_named_generics(args: &[Meta], name: &str) -> Result<Generics> {
 	const DEFAULT: &str = "<>";