Test: add read-only directory and file tests for dbm.sqlite3

Author: GeneralK1ng

Lib/test/test_dbm_sqlite3.py

@@ -1,4 +1,5 @@
 import os
+import stat
 import sys
 import unittest
 from contextlib import closing
@@ -115,6 +116,40 @@ def test_readonly_open_without_wal_shm(self):
         self.assertEqual(self.db[b"key"], b"value")
 
 
+class ReadOnlyFilesystem(unittest.TestCase):
+
+    def setUp(self):
+        self.test_dir = os_helper.TESTFN
+        os.mkdir(self.test_dir)
+        self.db_path = os.path.join(self.test_dir, "test.db")
+
+        db = dbm_sqlite3.open(self.db_path, "c")
+        db[b"key"] = b"value"
+        db.close()
+
+    def tearDown(self):
+        os.chmod(self.db_path, stat.S_IWRITE)
+        os.chmod(self.test_dir, stat.S_IWRITE | stat.S_IEXEC | stat.S_IREAD)
+        os_helper.rmtree(self.test_dir)
+
+    def test_open_readonly_dir_success_ro(self):
+        os.chmod(self.test_dir, stat.S_IREAD | stat.S_IEXEC)
+        with dbm_sqlite3.open(self.db_path, "r") as db:
+            self.assertEqual(db[b"key"], b"value")
+
+    def test_open_readonly_file_success(self):
+        os.chmod(self.db_path, stat.S_IREAD)
+        with dbm_sqlite3.open(self.db_path, "r") as db:
+            self.assertEqual(db[b"key"], b"value")
+
+    def test_open_readonly_file_fail_rw(self):
+        os.chmod(self.db_path, stat.S_IREAD)
+        with dbm_sqlite3.open(self.db_path, "w") as db:
+            with self.assertRaises(OSError):
+                db[b"newkey"] = b"newvalue"
+
+
+
 class ReadWrite(_SQLiteDbmTests):
 
     def setUp(self):