diff --git a/core/src/crsqlite.test.c b/core/src/crsqlite.test.c
index ed7037ccb..539322255 100644
--- a/core/src/crsqlite.test.c
+++ b/core/src/crsqlite.test.c
@@ -229,11 +229,10 @@ static void teste2e() {
   assert(rc == SQLITE_ROW);
 
   const char *tmpSiteid = (const char *)sqlite3_column_text(pStmt3, 0);
-  printf("db1sid: %s\n", db1siteid);
-  printf("db2sid: %s\n", db2siteid);
-  printf("db3sid: %s\n", db3siteid);
-  printf("tempsid: %s\n", tmpSiteid);
-  // printf("tmp: %s, db3: %s", tmpSiteid, db3siteid);
+  // printf("db1sid: %s\n", db1siteid);
+  // printf("db2sid: %s\n", db2siteid);
+  // printf("db3sid: %s\n", db3siteid);
+  // printf("tempsid: %s\n", tmpSiteid);
   assert(strcmp(tmpSiteid, db1siteid) == 0);
 
   rc = sqlite3_step(pStmt3);
diff --git a/py/correctness/tests/test_siteid.py b/py/correctness/tests/test_siteid.py
index 2b4866558..16500d2af 100644
--- a/py/correctness/tests/test_siteid.py
+++ b/py/correctness/tests/test_siteid.py
@@ -1,6 +1,17 @@
 import pathlib
 from uuid import UUID
 from crsql_correctness import connect
+from pprint import pprint
+
+
+def sync_left_to_right(l, r, since):
+    r_site_id = r.execute("SELECT crsql_site_id()").fetchone()[0]
+    changes = l.execute(
+        "SELECT * FROM crsql_changes WHERE db_version > ? AND site_id IS NOT ?", (since, r_site_id))
+    for change in changes:
+        r.execute(
+            "INSERT INTO crsql_changes VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)", change)
+    r.commit()
 
 
 def test_c1():
@@ -32,9 +43,62 @@ def test_c3c4():
     assert siteid_initial == siteid_restored
 
 
+# Site id is set to crsql_site_id on local writes
 def test_site_id_for_local_writes():
-    None
+    c = connect(":memory:")
+    c.execute("CREATE TABLE foo (id not null, x, y, primary key (id))")
+    c.execute("SELECT crsql_as_crr('foo')")
+    c.commit()
+
+    c.execute("INSERT INTO foo VALUES (1, 2, 3)")
+    c.commit()
+
+    def check_counts():
+        total_changes_count = c.execute(
+            "SELECT count(*) FROM crsql_changes").fetchone()[0]
+        changes_with_local_site_count = c.execute(
+            "SELECT count(*) FROM crsql_changes WHERE site_id = crsql_site_id()").fetchone()[0]
+        assert total_changes_count == changes_with_local_site_count
+
+    c.execute("UPDATE foo SET x = 3 WHERE id = 1")
+    c.commit()
+    check_counts()
+
+    c.execute("INSERT OR REPLACE INTO foo VALUES (1, 5, 9)")
+    c.commit()
+    check_counts()
+
+    c.execute("DELETE FROM foo")
+    c.commit()
+    check_counts()
 
 
 def test_site_id_from_merge():
-    None
+    def simple_schema():
+        a = connect(":memory:")
+        a.execute("create table foo (a primary key not null, b);")
+        a.commit()
+        a.execute("SELECT crsql_as_crr('foo')")
+        a.commit()
+        return a
+
+    a = simple_schema()
+    a.execute("INSERT INTO foo VALUES (1, 2.0e2);")
+    a.commit()
+    a.execute("INSERT INTO foo VALUES (2, X'1232');")
+    a.commit()
+
+    b = simple_schema()
+    c = simple_schema()
+
+    sync_left_to_right(a, b, 0)
+    sync_left_to_right(b, c, 0)
+
+    site_ids_fromC = c.execute(
+        "SELECT site_id FROM crsql_changes ORDER BY pk ASC").fetchall()
+    site_ids_fromB = b.execute(
+        "SELECT site_id FROM crsql_changes ORDER BY pk ASC").fetchall()
+    site_ids_fromA = a.execute(
+        "SELECT site_id FROM crsql_changes ORDER BY pk ASC").fetchall()
+    assert site_ids_fromC == site_ids_fromA
+    assert site_ids_fromB == site_ids_fromA