Fix clippy warnings

src/busy.rs

@@ -81,7 +81,6 @@ mod test {
     use std::sync::mpsc::sync_channel;
     use std::thread;
     use std::time::Duration;
-    use tempfile;
 
     use crate::{Connection, Error, ErrorCode, Result, TransactionBehavior, NO_PARAMS};
 

src/lib.rs

@@ -870,7 +870,6 @@ mod test {
     use fallible_iterator::FallibleIterator;
     use std::error::Error as StdError;
     use std::fmt;
-    use tempfile;
 
     // this function is never called, but is still type checked; in
     // particular, calls with specific instantiations will require

src/types/mod.rs

@@ -105,8 +105,6 @@ impl fmt::Display for Type {
 
 #[cfg(test)]
 mod test {
-    use time;
-
     use super::Value;
     use crate::{Connection, Error, NO_PARAMS};
     use std::f64::EPSILON;

src/types/serde_json.rs

@@ -28,7 +28,6 @@ impl FromSql for Value {
 mod test {
     use crate::types::ToSql;
     use crate::{Connection, NO_PARAMS};
-    use serde_json;
 
     fn checked_memory_handle() -> Connection {
         let db = Connection::open_in_memory().unwrap();

src/types/time.rs

@@ -1,5 +1,3 @@
-use time;
-
 use crate::types::{FromSql, FromSqlError, FromSqlResult, ToSql, ToSqlOutput, ValueRef};
 use crate::Result;
 
@@ -37,7 +35,6 @@ impl FromSql for time::Timespec {
 #[cfg(test)]
 mod test {
     use crate::{Connection, Result, NO_PARAMS};
-    use time;
 
     fn checked_memory_handle() -> Connection {
         let db = Connection::open_in_memory().unwrap();

src/vtab/csvtab.rs

@@ -1,7 +1,6 @@
 //! CSV Virtual Table.
 //!
 //! Port of [csv](http://www.sqlite.org/cgi/src/finfo?name=ext/misc/csv.c) C extension.
-use csv;
 use std::fs::File;
 use std::os::raw::c_int;
 use std::path::Path;