add broken shadow table test

tests/test-general.py

@@ -0,0 +1,55 @@
+import sqlite3
+from collections import OrderedDict
+import pytest
+
+
+@pytest.mark.skipif(
+    sqlite3.sqlite_version_info[1] < 37,
+    reason="pragma_table_list was added in SQLite 3.37",
+)
+def test_shadow(db, snapshot):
+    db.execute(
+        "create virtual table v using vec0(a float[1], partition text partition key, metadata text, +name text, chunk_size=8)"
+    )
+    assert exec(db, "select * from sqlite_master order by name") == snapshot()
+    assert (
+        exec(db, "select * from pragma_table_list where type = 'shadow'") == snapshot()
+    )
+
+    db.execute("drop table v;")
+    assert (
+        exec(db, "select * from pragma_table_list where type = 'shadow'") == snapshot()
+    )
+
+
+def exec(db, sql, parameters=[]):
+    try:
+        rows = db.execute(sql, parameters).fetchall()
+    except (sqlite3.OperationalError, sqlite3.DatabaseError) as e:
+        return {
+            "error": e.__class__.__name__,
+            "message": str(e),
+        }
+    a = []
+    for row in rows:
+        o = OrderedDict()
+        for k in row.keys():
+            o[k] = row[k]
+        a.append(o)
+    result = OrderedDict()
+    result["sql"] = sql
+    result["rows"] = a
+    return result
+
+
+def vec0_shadow_table_contents(db, v):
+    shadow_tables = [
+        row[0]
+        for row in db.execute(
+            "select name from sqlite_master where name like ? order by 1", [f"{v}_%"]
+        ).fetchall()
+    ]
+    o = {}
+    for shadow_table in shadow_tables:
+        o[shadow_table] = exec(db, f"select * from {shadow_table}")
+    return o