Clean up warnings in integration tests

At least one of these had become a hard error in the most recent beta

Author: sgrif

diesel_tests/tests/annotations.rs

@@ -32,7 +32,7 @@ fn association_where_parent_and_child_have_underscores() {
     #[derive(PartialEq, Eq, Debug, Clone, Queryable, Identifiable)]
     #[has_many(special_comments)]
     #[belongs_to(User)]
-    struct SpecialPost {
+    pub struct SpecialPost {
         id: i32,
         user_id: i32,
         title: String
@@ -92,7 +92,6 @@ fn association_where_parent_and_child_have_underscores() {
 // This module has no test functions, as it's only to test compilation.
 mod associations_can_have_nullable_foreign_keys {
     #![allow(dead_code)]
-    use diesel::prelude::*;
 
     table! {
         foos{
@@ -146,7 +145,9 @@ mod lifetimes_with_names_other_than_a {
 }
 
 mod custom_foreign_keys_are_respected_on_belongs_to {
-    use schema::{users, User};
+    #![allow(dead_code)]
+
+    use schema::User;
 
     table! { special_posts { id -> Integer, author_id -> Integer, } }
 

diesel_tests/tests/associations.rs

@@ -107,6 +107,7 @@ fn grouping_associations_maintains_ordering() {
     assert_eq!(expected_data, users_and_posts);
 }
 
+#[test]
 fn associations_can_be_grouped_multiple_levels_deep() {
     // I'm manually defining the data rather than loding from the database here,
     // as it makes the tests *way* more readable if I omit setup here. This is

diesel_tests/tests/postgres_specific_schema.rs

@@ -1,5 +1,4 @@
-use diesel::*;
-use super::{User, posts, comments, users};
+use super::{User, posts, comments};
 
 #[derive(PartialEq, Eq, Debug, Clone, Queryable, Identifiable)]
 #[has_many(comments)]

diesel_tests/tests/types.rs

@@ -404,7 +404,6 @@ fn text_array_can_be_assigned_to_varchar_array_column() {
 #[cfg(feature = "postgres")]
 fn third_party_crates_can_add_new_types() {
     use std::error::Error;
-    use std::io::prelude::*;
 
     struct MyInt;