diff --git a/tests/test_signatures.py b/tests/test_signatures.py
index d62c6707b..e6a1811f5 100644
--- a/tests/test_signatures.py
+++ b/tests/test_signatures.py
@@ -41,6 +41,14 @@ def signature_other_digest(valid_signature):
     signature = valid_signature.copy()
     signature["Bundle"]["Payload"]["digest"] = "sha256:123456"
     return signature
+def tempered_signature():
+    signature_file = next(TEMPERED_SIGNATURES_PATH.glob("**/*.json"))
+    with open(signature_file, "r") as signature_file:
+        signatures = json.load(signature_file)
+        return signatures.pop()
+
+
+@pytest.fixture
 
 
 def test_load_valid_signatures(mocker):