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6 changes: 4 additions & 2 deletions tests/unit/test_security.py
Original file line number Diff line number Diff line change
Expand Up @@ -60,8 +60,10 @@ def test_invalid_token_raises(self):

def test_tampered_token_raises(self):
token = create_access_token(subject="user-123")
# Flip the last character
tampered = token[:-1] + ("X" if token[-1] != "X" else "Y")
# Replace entire signature segment with garbage — flipping one char is flaky
# because base64url padding can tolerate single-char changes
header, payload, _ = token.split(".")
tampered = f"{header}.{payload}.invalidsignatureXXXXXXXX"
with pytest.raises(JWTError):
decode_token(tampered)

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