Fix doc tests to work whether or not serde derive feature is used

serde_test/src/assert.rs

@@ -9,7 +9,7 @@ use std::fmt::Debug;
 /// Runs both `assert_ser_tokens` and `assert_de_tokens`.
 ///
 /// ```edition2021
-/// # use serde::{Serialize, Deserialize};
+/// # use serde_derive::{Serialize, Deserialize};
 /// # use serde_test::{assert_tokens, Token};
 /// #
 /// #[derive(Serialize, Deserialize, PartialEq, Debug)]
@@ -40,7 +40,7 @@ where
 /// Asserts that `value` serializes to the given `tokens`.
 ///
 /// ```edition2021
-/// # use serde::{Serialize, Deserialize};
+/// # use serde_derive::{Serialize, Deserialize};
 /// # use serde_test::{assert_ser_tokens, Token};
 /// #
 /// #[derive(Serialize, Deserialize, PartialEq, Debug)]
@@ -82,7 +82,7 @@ where
 /// use std::sync::{Arc, Mutex};
 /// use std::thread;
 ///
-/// use serde::Serialize;
+/// use serde_derive::Serialize;
 /// use serde_test::{assert_ser_tokens_error, Token};
 ///
 /// #[derive(Serialize)]
@@ -131,7 +131,7 @@ where
 /// Asserts that the given `tokens` deserialize into `value`.
 ///
 /// ```edition2021
-/// # use serde::{Serialize, Deserialize};
+/// # use serde_derive::{Serialize, Deserialize};
 /// # use serde_test::{assert_de_tokens, Token};
 /// #
 /// #[derive(Serialize, Deserialize, PartialEq, Debug)]
@@ -185,7 +185,7 @@ where
 /// Asserts that the given `tokens` yield `error` when deserializing.
 ///
 /// ```edition2021
-/// # use serde::{Serialize, Deserialize};
+/// # use serde_derive::{Serialize, Deserialize};
 /// # use serde_test::{assert_de_tokens_error, Token};
 /// #
 /// #[derive(Serialize, Deserialize, PartialEq, Debug)]