diff --git a/auraed/src/init/system_runtimes/mod.rs b/auraed/src/init/system_runtimes/mod.rs
index 39003d3da..b3742f5fb 100644
--- a/auraed/src/init/system_runtimes/mod.rs
+++ b/auraed/src/init/system_runtimes/mod.rs
@@ -108,3 +108,57 @@ async fn create_tcp_socket_stream(
     info!("TCP Access Socket created: {:?}", socket_addr);
     Ok(SocketStream::Tcp(TcpListenerStream::new(sock)))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::{
+        DaemonSystemRuntime, SocketStream, SystemRuntime, SystemRuntimeError,
+    };
+    use crate::init::logging::LoggingError;
+    use crate::{AURAED_RUNTIME, AuraedRuntime};
+    use std::os::unix::fs::{FileTypeExt, PermissionsExt};
+
+    #[tokio::test]
+    async fn daemon_system_runtime_should_default_to_unix_socket_when_no_address()
+     {
+        let runtime = if let Some(runtime) = AURAED_RUNTIME.get() {
+            runtime
+        } else {
+            let tempdir = tempfile::tempdir().expect("tempdir");
+            let mut runtime = AuraedRuntime::default();
+            runtime.runtime_dir = tempdir.into_path().join("runtime");
+            runtime.library_dir = runtime.runtime_dir.join("library");
+            AURAED_RUNTIME.set(runtime).expect("set runtime");
+            AURAED_RUNTIME.get().expect("runtime set")
+        };
+
+        let expected_socket = runtime.default_socket_address();
+
+        let stream = match DaemonSystemRuntime.init(false, None).await {
+            Ok(stream) => stream,
+            // Another test may have already installed a global logger; if so, skip
+            // rather than failing on a logging init error.
+            Err(SystemRuntimeError::Logging(LoggingError::TryInitError(_))) => {
+                return;
+            }
+            Err(e) => panic!("init daemon system runtime: {e:?}"),
+        };
+
+        let parent = expected_socket.parent().expect("socket parent");
+        assert!(parent.is_dir(), "expected parent dir to exist");
+
+        let meta = std::fs::symlink_metadata(&expected_socket)
+            .expect("socket metadata");
+        assert!(meta.file_type().is_socket(), "expected a unix socket file");
+        assert_eq!(
+            meta.permissions().mode() & 0o777,
+            0o766,
+            "expected socket mode 0o766"
+        );
+
+        match stream {
+            SocketStream::Unix(_) => {}
+            other => panic!("expected Unix listener, got {:?}", other),
+        }
+    }
+}
diff --git a/auraed/src/observe/cgroup_cache.rs b/auraed/src/observe/cgroup_cache.rs
index ce9825887..cfb6c8fb8 100644
--- a/auraed/src/observe/cgroup_cache.rs
+++ b/auraed/src/observe/cgroup_cache.rs
@@ -90,53 +90,51 @@ mod test {
     use std::fs;
     use std::fs::File;
     use std::os::unix::fs::DirEntryExt;
+    use tempfile::TempDir;
 
     use super::*;
 
     #[test]
     fn get_must_return_none_when_file_doesnt_exist() {
-        let mut cache = CgroupCache::new(OsString::from("/tmp"));
+        let tempdir = TempDir::new().expect("tempdir");
+        let mut cache = CgroupCache::new(tempdir.path().into());
 
         assert_eq!(cache.get(123), None);
     }
 
     #[test]
     fn get_must_return_file_for_ino() {
-        let mut cache = CgroupCache::new(OsString::from("/tmp"));
+        let tempdir = TempDir::new().expect("tempdir");
+        let mut cache = CgroupCache::new(tempdir.path().into());
 
         let file_name1 = uuid::Uuid::new_v4().to_string();
-        let ino1 = create_file(&OsString::from(&file_name1));
+        let ino1 = create_file(&tempdir, &OsString::from(&file_name1));
 
         let file_name2 = uuid::Uuid::new_v4().to_string();
-        let ino2 = create_file(&OsString::from(&file_name2));
+        let ino2 = create_file(&tempdir, &OsString::from(&file_name2));
 
-        assert!(cache.get(ino1).is_some());
-        assert!(
-            cache
-                .get(ino1)
-                .expect("should not happen")
-                .eq_ignore_ascii_case(format!("/tmp/{file_name1}"))
+        assert_eq!(
+            cache.get(ino1).as_ref().map(|s| s.as_os_str()),
+            Some(tempdir.path().join(&file_name1).as_os_str())
         );
 
-        assert!(cache.get(ino2).is_some());
-        assert!(
-            cache
-                .get(ino2)
-                .expect("should not happen")
-                .eq_ignore_ascii_case(format!("/tmp/{file_name2}"))
+        assert_eq!(
+            cache.get(ino2).as_ref().map(|s| s.as_os_str()),
+            Some(tempdir.path().join(&file_name2).as_os_str())
         );
     }
 
-    fn create_file(file_name: &OsString) -> u64 {
+    fn create_file(dir: &TempDir, file_name: &OsString) -> u64 {
         let _file = File::create(format!(
-            "/tmp/{}",
+            "{}/{}",
+            dir.path().display(),
             file_name
                 .to_ascii_lowercase()
                 .to_str()
                 .expect("couldn't convert filename")
         ))
         .expect("couldn't create file");
-        let dir_entry = fs::read_dir("/tmp")
+        let dir_entry = fs::read_dir(dir.path())
             .expect("tmp dir entries")
             .find(|e| {
                 println!("{:?}", e.as_ref().expect("").file_name());