diff --git a/tests/test_database.py b/tests/test_database.py
index 79eea7d..c8f16a4 100644
--- a/tests/test_database.py
+++ b/tests/test_database.py
@@ -442,6 +442,8 @@ def test_database_sync_clocks():
     db = database.Database(":memory:", random_slug())
     db.ensure_database_schema()
 
+    db_clock = db.get_clock()
+
     other_origin = f"other_{random_slug()}"
 
     other_clock = db.get_sync_clock(other_origin)
@@ -452,6 +454,9 @@ def test_database_sync_clocks():
     other_clock = db.get_sync_clock(other_origin)
     assert other_clock == 1234
 
+    # Sync table doesn't affect the clock.
+    assert db.get_clock() == db_clock
+
 
 def test_database_do_sync():
     db = database.Database(":memory:", random_slug())
@@ -484,3 +489,22 @@ def test_database_do_sync_conflict():
 
     feeds = db.load_all(feed_limit=99999)
     assert feeds == [FEED, OTHER_FEED]
+
+
+def test_database_no_change_no_clock():
+    db = database.Database(":memory:", random_slug())
+    db.ensure_database_schema()
+
+    other = database.Database(":memory:", random_slug())
+    other.ensure_database_schema()
+
+    db.store_feed(FEED)
+    db.store_feed(OTHER_FEED)
+    other.store_feed(FEED)
+    other.store_feed(OTHER_FEED)
+
+    db_clock = db.get_clock()
+
+    db.sync_from(other)
+
+    assert db.get_clock() == db_clock