move MemoryDB's tests into tests module

util/src/memorydb.rs

@@ -250,8 +250,12 @@ impl HashDB for MemoryDB {
 	}
 }
 
-#[test]
-fn memorydb_remove_and_purge() {
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn memorydb_remove_and_purge() {
 		let hello_bytes = b"Hello world!";
 		let hello_key = hello_bytes.sha3();
 
@@ -274,10 +278,10 @@ fn memorydb_remove_and_purge() {
 		assert_eq!(&*m.remove_and_purge(&hello_key).unwrap(), hello_bytes);
 		assert_eq!(m.raw(&hello_key), None);
 		assert!(m.remove_and_purge(&hello_key).is_none());
-}
+	}
 
-#[test]
-fn consolidate() {
+	#[test]
+	fn consolidate() {
 		let mut main = MemoryDB::new();
 		let mut other = MemoryDB::new();
 		let remove_key = other.insert(b"doggo");
@@ -292,4 +296,5 @@ fn consolidate() {
 
 		assert_eq!(overlay.get(&remove_key).unwrap(), &(DBValue::from_slice(b"doggo"), 0));
 		assert_eq!(overlay.get(&insert_key).unwrap(), &(DBValue::from_slice(b"arf"), 2));
+	}
 }