update modules to 2018 edition standards in test modules

src/env.rs

@@ -179,26 +179,20 @@ impl Rkv {
 
 #[cfg(test)]
 mod tests {
-    extern crate byteorder;
-    extern crate tempfile;
-
-    use self::byteorder::{
+    use byteorder::{
         ByteOrder,
         LittleEndian,
     };
-
-    use self::tempfile::Builder;
-
     use std::{
         fs,
         str,
+        sync::{
+            Arc,
+            RwLock,
+        },
         thread,
     };
-
-    use std::sync::{
-        Arc,
-        RwLock,
-    };
+    use tempfile::Builder;
 
     use super::*;
     use crate::*;

src/integer.rs

@@ -144,10 +144,8 @@ impl IntegerStore {
 
 #[cfg(test)]
 mod tests {
-    extern crate tempfile;
-
-    use self::tempfile::Builder;
     use std::fs;
+    use tempfile::Builder;
 
     use super::*;
     use crate::*;

src/lib.rs

@@ -38,9 +38,6 @@
 //!
 //! ## Basic Usage
 //! ```
-//! extern crate rkv;
-//! extern crate tempfile;
-//!
 //! use rkv::{Manager, Rkv, Store, Value};
 //! use std::fs;
 //! use tempfile::Builder;

src/manager.rs

@@ -122,10 +122,8 @@ impl Manager {
 
 #[cfg(test)]
 mod tests {
-    extern crate tempfile;
-
-    use self::tempfile::Builder;
     use std::fs;
+    use tempfile::Builder;
 
     use super::*;
 

tests/integer-store.rs

@@ -8,22 +8,14 @@
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations under the License.
 
-extern crate bincode;
-extern crate rkv;
-extern crate serde;
-#[macro_use]
-extern crate serde_derive;
-extern crate tempfile;
-
 use rkv::{
     PrimitiveInt,
     Rkv,
     Value,
 };
-
-use self::tempfile::Builder;
-
+use serde_derive::Serialize;
 use std::fs;
+use tempfile::Builder;
 
 #[test]
 fn test_integer_keys() {

tests/manager.rs

@@ -8,19 +8,15 @@
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations under the License.
 
-extern crate rkv;
-extern crate tempfile;
-
 use rkv::{
     Manager,
     Rkv,
 };
-
-use self::tempfile::Builder;
-
-use std::fs;
-
-use std::sync::Arc;
+use std::{
+    fs,
+    sync::Arc,
+};
+use tempfile::Builder;
 
 #[test]
 // Identical to the same-named unit test, but this one confirms that it works