From 35b4aead8eb91c867a4e27394e1e9f3d74f369b5 Mon Sep 17 00:00:00 2001
From: Noah Pendleton <2538614+noahp@users.noreply.github.com>
Date: Mon, 12 Sep 2022 10:59:51 -0400
Subject: [PATCH] Fail when new snapshots are added and not updated

See upstream:

https://github.com/syrusakbary/snapshottest/issues/73

If not configured to update the tests, fail when new tests are added.
---
 snapshottest/module.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/snapshottest/module.py b/snapshottest/module.py
index e31b46c..ed8394a 100644
--- a/snapshottest/module.py
+++ b/snapshottest/module.py
@@ -255,7 +255,10 @@ def assert_match(self, value, name=""):
             try:
                 prev_snapshot = self.module[self.test_name]
             except SnapshotNotFound:
-                self.store(value)  # first time this test has been seen
+                if self.update:
+                    self.store(value)  # first time this test has been seen
+                else:
+                    raise
             else:
                 try:
                     self.assert_value_matches_snapshot(value, prev_snapshot)