fix: move checks for automated test mode into global.rs (#2956)

* fix: move checks for test/production mode into one place - global.rs

* chore: rustfmt

chain/tests/chain_test_helper.rs

@@ -102,7 +102,7 @@ where
 		let mut b =
 			core::core::Block::new(&prev, vec![], next_header_info.clone().difficulty, reward)
 				.unwrap();
-		b.header.timestamp = prev.timestamp + Duration::seconds(160);
+		b.header.timestamp = prev.timestamp + Duration::seconds(60);
 		b.header.pow.secondary_scaling = next_header_info.secondary_scaling;
 
 		chain.set_txhashset_roots(&mut b).unwrap();

chain/tests/test_txhashset.rs

@@ -17,9 +17,7 @@ use grin_core as core;
 
 use grin_util as util;
 
-use std::collections::HashSet;
-use std::fs::{self, File, OpenOptions};
-use std::iter::FromIterator;
+use std::fs::{self, File};
 use std::path::{Path, PathBuf};
 use std::sync::Arc;