test: remove TestTreeState

Author: jns-ps

crates/common/src/lib.rs

@@ -8,7 +8,5 @@ pub mod tree;
 #[macro_use]
 extern crate log;
 
-#[cfg(feature = "test_utils")]
-pub mod test_utils;
 #[cfg(feature = "test_utils")]
 pub mod transaction_builder;