tests: added delta.DeltaTest.test_delta_backup_from_past

tests/delta.py

@@ -711,14 +711,12 @@ class DeltaTest(ProbackupTest, unittest.TestCase):
                 1, 0,
                 "Expecting Error because we are connecting to deleted database"
                 "\n Output: {0} \n CMD: {1}".format(
-                    repr(self.output), self.cmd)
+                    repr(self.output), self.cmd))
-            )
         except QueryException as e:
             self.assertTrue(
                 'FATAL:  database "db1" does not exist' in e.message,
                 '\n Unexpected Error Message: {0}\n CMD: {1}'.format(
-                    repr(e.message), self.cmd)
+                    repr(e.message), self.cmd))
-            )
 
         # Clean after yourself
         self.del_test_dir(module_name, fname)
@@ -1307,3 +1305,53 @@ class DeltaTest(ProbackupTest, unittest.TestCase):
 
         # Clean after yourself
         self.del_test_dir(module_name, fname)
+
+    def test_delta_backup_from_past(self):
+        """
+        make node, take FULL stream backup, take DELTA stream backup,
+        restore FULL backup, try to take second DELTA stream backup
+        """
+        fname = self.id().split('.')[3]
+        node = self.make_simple_node(
+            base_dir=os.path.join(module_name, fname, 'node'),
+            initdb_params=['--data-checksums'])
+
+        backup_dir = os.path.join(self.tmp_path, module_name, fname, 'backup')
+        self.init_pb(backup_dir)
+        self.add_instance(backup_dir, 'node', node)
+        node.slow_start()
+
+        backup_id = self.backup_node(
+            backup_dir, 'node', node, options=['--stream'])
+
+        node.pgbench_init(scale=3)
+
+        # First DELTA
+        self.backup_node(
+            backup_dir, 'node', node,
+            backup_type='delta', options=['--stream'])
+
+        # Restore FULL backup
+        node.cleanup()
+        self.restore_node(backup_dir, 'node', node, backup_id=backup_id)
+        node.slow_start()
+
+        # Second DELTA backup
+        try:
+            self.backup_node(
+                backup_dir, 'node', node,
+                backup_type='delta', options=['--stream'])
+            # we should die here because exception is what we expect to happen
+            self.assertEqual(
+                1, 0,
+                "Expecting Error because we are backing up an instance from the past"
+                "\n Output: {0} \n CMD: {1}".format(
+                    repr(self.output), self.cmd))
+        except QueryException as e:
+            self.assertTrue(
+                'Insert error message' in e.message,
+                '\n Unexpected Error Message: {0}\n CMD: {1}'.format(
+                    repr(e.message), self.cmd))
+
+        # Clean after yourself
+        self.del_test_dir(module_name, fname)