Fix background task tests colliding

We were creating multiple background tasks with the same progress text on multiple threads

rust/tests/backgroundtask.rs

@@ -10,25 +10,27 @@ fn session() -> Session {
 
 #[rstest]
 fn test_background_task_registered(_session: &Session) {
-    let task = BackgroundTask::new("test task", false);
+    let task_progress = "test registered";
+    let task = BackgroundTask::new(task_progress, false);
     BackgroundTask::running_tasks()
         .iter()
-        .find(|t| t.progress_text().as_str() == "test task")
+        .find(|t| t.progress_text().as_str() == task_progress)
         .expect("Task not running");
     task.finish();
     let still_running = BackgroundTask::running_tasks()
         .iter()
-        .find(|t| t.progress_text().as_str() == "test task")
+        .find(|t| t.progress_text().as_str() == task_progress)
         .is_some();
     assert!(!still_running, "Task still running");
 }
 
 #[rstest]
 fn test_background_task_cancellable(_session: &Session) {
-    let task = BackgroundTask::new("test task", false);
+    let task_progress = "test cancellable";
+    let task = BackgroundTask::new(task_progress, false);
     BackgroundTask::running_tasks()
         .iter()
-        .find(|t| t.progress_text().as_str() == "test task")
+        .find(|t| t.progress_text().as_str() == task_progress)
         .expect("Task not running");
     task.cancel();
     assert!(task.is_cancelled());
@@ -37,9 +39,9 @@ fn test_background_task_cancellable(_session: &Session) {
 
 #[rstest]
 fn test_background_task_progress(_session: &Session) {
-    let task = BackgroundTask::new("test task", false);
+    let task = BackgroundTask::new("test progress", false);
     let first_progress = task.progress_text().to_string();
-    assert_eq!(first_progress, "test task");
+    assert_eq!(first_progress, "test progress");
     task.set_progress_text("new progress");
     let second_progress = task.progress_text().to_string();
     assert_eq!(second_progress, "new progress");