fixup(runner test): add semaphore to prevent concurrent tests

Author: not-matthias

src/run/runner/tests.rs

@@ -304,11 +304,24 @@ fi
 mod memory {
     use super::*;
 
-    async fn get_memory_executor() -> MemoryExecutor {
-        let executor = MemoryExecutor;
-        let system_info = SystemInfo::new().unwrap();
-        executor.setup(&system_info, None).await.unwrap();
-        executor
+    async fn get_memory_executor() -> (SemaphorePermit<'static>, MemoryExecutor) {
+        static MEMORY_INIT: OnceCell<()> = OnceCell::const_new();
+        static MEMORY_SEMAPHORE: OnceCell<Semaphore> = OnceCell::const_new();
+
+        MEMORY_INIT
+            .get_or_init(|| async {
+                let executor = MemoryExecutor;
+                let system_info = SystemInfo::new().unwrap();
+                executor.setup(&system_info, None).await.unwrap();
+            })
+            .await;
+
+        let semaphore = MEMORY_SEMAPHORE
+            .get_or_init(|| async { Semaphore::new(1) })
+            .await;
+        let permit = semaphore.acquire().await.unwrap();
+
+        (permit, MemoryExecutor)
     }
 
     #[cfg(test)]
@@ -324,7 +337,7 @@ mod memory {
     #[tokio::test]
     async fn test_memory_executor(#[case] cmd: &str) {
         let (system_info, run_data, _temp_dir) = create_test_setup().await;
-        let executor = get_memory_executor().await;
+        let (_permit, executor) = get_memory_executor().await;
 
         let config = memory_config(cmd);
         executor
@@ -337,7 +350,7 @@ mod memory {
     #[tokio::test]
     async fn test_memory_executor_with_env(#[case] env_case: (&str, &str)) {
         let (system_info, run_data, _temp_dir) = create_test_setup().await;
-        let executor = get_memory_executor().await;
+        let (_permit, executor) = get_memory_executor().await;
 
         let (env_var, env_value) = env_case;
         temp_env::async_with_vars(&[(env_var, Some(env_value))], async {