diff --git a/crates/scyllaconn/Cargo.toml b/crates/scyllaconn/Cargo.toml
index 6c9234b..23f0918 100644
--- a/crates/scyllaconn/Cargo.toml
+++ b/crates/scyllaconn/Cargo.toml
@@ -9,6 +9,7 @@ futures-util = "0.3.31"
 pin-project = "1"
 async-channel = "2.3.1"
 scylla = "1.1"
+time = { version = "0.3.41", features = ["parsing", "formatting", "macros"] }
 autoerr = "0.0.3"
 daqbuf-err = { path = "../../../daqbuf-err" }
 netpod = { path = "../../../daqbuf-netpod", package = "daqbuf-netpod" }
diff --git a/crates/scyllaconn/src/binned2/msplspiter.rs b/crates/scyllaconn/src/binned2/msplspiter.rs
index b73234f..f09d2e4 100644
--- a/crates/scyllaconn/src/binned2/msplspiter.rs
+++ b/crates/scyllaconn/src/binned2/msplspiter.rs
@@ -44,9 +44,54 @@ impl Iterator for MspLspIter {
 fn test_iter_00() {
     let range = NanoRange::from_strings("2024-06-07T09:17:31Z", "2024-06-07T09:17:31Z").unwrap();
     let pbp = PrebinnedPartitioning::Sec1;
-    let mut it = MspLspIter::new(range, pbp);
-    // taskrun;
-    for x in it {
-        eprintln!("{:?}", x);
-    }
+    assert_eq!(pbp.patch_len(), 1200);
+    let it = MspLspIter::new(range, pbp);
+    let a: Vec<_> = it.collect();
+    assert_eq!(a.len(), 0);
+}
+
+#[test]
+fn test_iter_01() {
+    let range = NanoRange::from_strings("2024-06-07T09:17:31Z", "2024-06-07T09:17:32Z").unwrap();
+    let pbp = PrebinnedPartitioning::Sec1;
+    assert_eq!(pbp.patch_len(), 1200);
+    let it = MspLspIter::new(range, pbp.clone());
+    let a: Vec<_> = it.collect();
+    assert_eq!(a.len(), 1);
+    assert_eq!(a[0].0.0, 1431459);
+    assert_eq!(a[0].1.0, 1051);
+    let ts_sec = pbp.patch_len() as u64 * a[0].0.0 as u64 + a[0].1.0 as u64;
+    // time::UtcDateTime::new(time::Date::with, time)
+    let ts1 = time::UtcDateTime::from_unix_timestamp(ts_sec as i64).unwrap();
+    let fmt = time::macros::format_description!("[year]-[month]-[day]T[hour]:[minute]:[second]Z");
+    let ts2 = time::UtcDateTime::parse("2024-06-07T09:17:31Z", &fmt).unwrap();
+    assert_eq!(ts1, ts2);
+}
+
+#[test]
+fn test_iter_02() {
+    let range = NanoRange::from_strings("2024-06-07T09:17:31Z", "2024-06-07T09:22:00Z").unwrap();
+    let pbp = PrebinnedPartitioning::Sec1;
+    let it = MspLspIter::new(range, pbp.clone());
+    let a: Vec<_> = it.collect();
+    assert_eq!(a.len(), 240 + 29);
+    let e = &a[a.len() - 1];
+    assert_eq!(e.0.0, 1431460);
+    assert_eq!(e.1.0, 119);
+}
+
+#[test]
+fn test_iter_03() {
+    // Check clamped covering in correct direction
+    let range = NanoRange::from_strings("2024-06-07T09:17:31.1Z", "2024-06-07T09:21:59.8Z").unwrap();
+    let pbp = PrebinnedPartitioning::Sec1;
+    let it = MspLspIter::new(range, pbp.clone());
+    let a: Vec<_> = it.collect();
+    assert_eq!(a.len(), 240 + 29);
+    let e = &a[0];
+    assert_eq!(e.0.0, 1431459);
+    assert_eq!(e.1.0, 1051);
+    let e = &a[a.len() - 1];
+    assert_eq!(e.0.0, 1431460);
+    assert_eq!(e.1.0, 119);
 }