tests/schema_details: Simplify test setup

We don't need a full app for this test, a test database is sufficient.

Author: Turbo87

src/tests/schema_details.rs

@@ -1,8 +1,7 @@
+use crates_io_test_db::TestDatabase;
 use diesel::prelude::*;
 use diesel::sql_types::Text;
 
-use crate::tests::TestApp;
-
 #[test]
 fn all_columns_called_crate_id_have_a_cascading_foreign_key() {
     for row in get_fk_constraint_definitions("crate_id") {
@@ -70,8 +69,8 @@ struct TableNameAndConstraint {
 fn get_fk_constraint_definitions(column_name: &str) -> Vec<TableNameAndConstraint> {
     use diesel::sql_query;
 
-    let (app, _) = TestApp::init().empty();
-    let mut conn = app.db_conn();
+    let test_db = TestDatabase::new();
+    let mut conn = test_db.connect();
 
     sql_query(include_str!("load_foreign_key_constraints.sql"))
         .bind::<Text, _>(column_name)