diff --git a/tests/tape-inventory.rs b/tests/tape-inventory.rs
new file mode 100644
index 00000000..db8b44b5
--- /dev/null
+++ b/tests/tape-inventory.rs
@@ -0,0 +1,181 @@
+// Tape inventory tests
+//
+// # cargo test --release --test tape-inventory
+
+use std::path::PathBuf;
+use anyhow::{bail, Error};
+
+use proxmox::tools::{
+    Uuid,
+};
+
+use proxmox_backup::{
+    tape::{
+        Inventory,
+        file_formats::{
+            MediaSetLabel,
+        },
+    },
+};
+
+fn create_testdir(name: &str) -> Result<PathBuf, Error> {
+    let mut testdir: PathBuf = String::from("./target/testout").into();
+    testdir.push(std::module_path!());
+    testdir.push(name);
+
+    let _ = std::fs::remove_dir_all(&testdir);
+    let _ = std::fs::create_dir_all(&testdir);
+
+    Ok(testdir)
+}
+
+#[test]
+fn test_list_pool_media() -> Result<(), Error> {
+
+    let testdir = create_testdir("test_list_pool_media")?;
+    let mut inventory = Inventory::load(&testdir)?;
+
+    let ctime = 0;
+
+    let _tape1_uuid = inventory.generate_free_tape("tape1", ctime);
+    let tape2_uuid = inventory.generate_assigned_tape("tape2", "p1", ctime);
+
+    let set1 = MediaSetLabel::with_data("p1", Uuid::generate(), 0, ctime, None);
+
+    let tape3_uuid = inventory.generate_used_tape("tape3", set1.clone(), ctime);
+
+    let list = inventory.list_pool_media("nonexistent_pool");
+    assert_eq!(list.len(), 0);
+
+    let list = inventory.list_pool_media("p1");
+    assert_eq!(list.len(), 2);
+
+    let tape2 = list.iter().find(|media_id| &media_id.label.uuid == &tape2_uuid).unwrap();
+    assert!(tape2.media_set_label.is_none());
+
+    let tape3 = list.iter().find(|media_id| &media_id.label.uuid == &tape3_uuid).unwrap();
+    match tape3.media_set_label {
+        None => bail!("missing media set label"),
+        Some(ref set) => {
+            assert_eq!(set.seq_nr, 0);
+            assert_eq!(set.uuid, set1.uuid);
+        }
+    }
+    Ok(())
+}
+
+#[test]
+fn test_media_set_simple() -> Result<(), Error> {
+
+    let testdir = create_testdir("test_media_set_simple")?;
+    let mut inventory = Inventory::load(&testdir)?;
+
+    let ctime = 0;
+
+    let sl1 = MediaSetLabel::with_data("p1", Uuid::generate(), 0, ctime + 10, None);
+    let sl2 = MediaSetLabel::with_data("p1", sl1.uuid.clone(), 1, ctime+ 20, None);
+    let sl3 = MediaSetLabel::with_data("p1", sl1.uuid.clone(), 2, ctime + 30, None);
+
+
+    let tape1_uuid = inventory.generate_used_tape("tape1", sl1.clone(), 0);
+    let tape2_uuid = inventory.generate_used_tape("tape2", sl2.clone(), 0);
+    let tape3_uuid = inventory.generate_used_tape("tape3", sl3.clone(), 0);
+
+    // generate incomplete media set in pool p2
+    let sl4 = MediaSetLabel::with_data("p2", Uuid::generate(), 1, ctime + 40, None);
+    let tape4_uuid = inventory.generate_used_tape("tape4", sl4.clone(), 0);
+
+    let media_list = inventory.list_pool_media("p1");
+    assert_eq!(media_list.len(), 3);
+
+    let media_list = inventory.list_pool_media("p2");
+    assert_eq!(media_list.len(), 1);
+
+    // reload, the do more tests
+
+    let inventory = Inventory::load(&testdir)?;
+
+    // test pool p1
+
+    let media_set = inventory.compute_media_set_members(&sl1.uuid)?;
+    assert_eq!(media_set.uuid(), &sl1.uuid);
+
+    let media_list = media_set.media_list();
+    assert_eq!(media_list.len(), 3);
+
+    assert_eq!(media_list[0], Some(tape1_uuid.clone()));
+    assert_eq!(media_list[1], Some(tape2_uuid.clone()));
+    assert_eq!(media_list[2], Some(tape3_uuid.clone()));
+
+    // test media set start time
+    assert_eq!(inventory.media_set_start_time(&sl1.uuid), Some(ctime + 10));
+
+
+    // test pool p2
+    let media_set = inventory.compute_media_set_members(&sl4.uuid)?;
+    assert_eq!(media_set.uuid(), &sl4.uuid);
+
+    let media_list = media_set.media_list();
+    assert_eq!(media_list.len(), 2);
+
+    assert_eq!(media_list[0], None);
+    assert_eq!(media_list[1], Some(tape4_uuid.clone()));
+
+    // start time for incomplete set must be None
+    assert_eq!(inventory.media_set_start_time(&sl4.uuid), None);
+
+    Ok(())
+}
+
+
+#[test]
+fn test_latest_media_set() -> Result<(), Error> {
+
+    let testdir = create_testdir("test_latest_media_set")?;
+
+    let insert_tape = |inventory: &mut Inventory, pool, label, seq_nr, ctime| -> Uuid {
+        let sl = MediaSetLabel::with_data(pool, Uuid::generate(), seq_nr, ctime, None);
+        let uuid = sl.uuid.clone();
+        inventory.generate_used_tape(label, sl, 0);
+        uuid
+    };
+
+    let check_latest = |inventory: &Inventory, pool: &str, label: &str| {
+        let latest_set = inventory.latest_media_set(pool).unwrap();
+        let set = inventory.compute_media_set_members(&latest_set).unwrap();
+        let media_list = set.media_list();
+        assert_eq!(media_list.iter().filter(|s| s.is_some()).count(), 1);
+        let media_uuid = media_list.iter().find(|s| s.is_some()).unwrap().clone().unwrap();
+        let media = inventory.lookup_media(&media_uuid).unwrap();
+        assert_eq!(media.label.label_text, label);
+    };
+
+    let mut inventory = Inventory::load(&testdir)?;
+
+    let ctime = 0;
+
+    // test 3 sets with different start times
+
+    insert_tape(&mut inventory, "p1", "p1tape1", 0, ctime + 10);
+    insert_tape(&mut inventory, "p1", "p1tape2", 0, ctime + 20);
+    insert_tape(&mut inventory, "p1", "p1tape3", 0, ctime + 30);
+
+    check_latest(&inventory, "p1", "p1tape3");
+
+    // test 2 sets with same start times, should fail
+
+    insert_tape(&mut inventory, "p2", "p2tape1", 0, ctime + 10);
+    insert_tape(&mut inventory, "p2", "p2tape2", 0, ctime + 10);
+
+    assert_eq!(inventory.latest_media_set("p2"), None);
+
+    // test with incomplete sets
+
+    insert_tape(&mut inventory, "p3", "p3tape1", 5, ctime + 50);
+    insert_tape(&mut inventory, "p3", "p3tape2", 1, ctime + 10);
+    insert_tape(&mut inventory, "p3", "p3tape3", 0, ctime + 20);
+
+    check_latest(&inventory, "p3", "p3tape1");
+
+    Ok(())
+}