Replace lazy_static with std::cell:OnceLock

Cargo.toml

@@ -20,7 +20,6 @@ futures-core = "0.3"
 futures-util = "0.3"
 futures-sink = "0.3"
 keyed_priority_queue = "0.4"
-lazy_static = "1"
 lru = "0.12.0"
 mio = { version = "0.8.0", features = ["os-poll", "net"] }
 mysql_common = { version = "0.32", default-features = false }

src/lib.rs

@@ -608,9 +608,8 @@ pub mod prelude {
 
 #[doc(hidden)]
 pub mod test_misc {
-    use lazy_static::lazy_static;
-
     use std::env;
+    use std::sync::OnceLock;
 
     use crate::opts::{Opts, OptsBuilder, SslOpts};
 
@@ -621,26 +620,17 @@ pub mod test_misc {
         _dummy(err);
     }
 
-    lazy_static! {
-        pub static ref DATABASE_URL: String = {
+    pub fn get_opts() -> OptsBuilder {
+        static DATABASE_OPTS: OnceLock<Opts> = OnceLock::new();
+        let database_opts = DATABASE_OPTS.get_or_init(|| {
             if let Ok(url) = env::var("DATABASE_URL") {
-                let opts = Opts::from_url(&url).expect("DATABASE_URL invalid");
-                if opts
-                    .db_name()
-                    .expect("a database name is required")
-                    .is_empty()
-                {
-                    panic!("database name is empty");
-                }
-                url
+                Opts::from_url(&url).expect("DATABASE_URL invalid")
             } else {
-                "mysql://root:password@localhost:3307/mysql".into()
+                Opts::from_url("mysql://root:password@localhost:3307/mysql").unwrap()
             }
-        };
-    }
+        });
 
-    pub fn get_opts() -> OptsBuilder {
-        let mut builder = OptsBuilder::from_opts(Opts::from_url(&DATABASE_URL).unwrap());
+        let mut builder = OptsBuilder::from_opts(database_opts.clone());
         if test_ssl() {
             let ssl_opts = SslOpts::default()
                 .with_danger_skip_domain_validation(true)