TST: Decrypt file which is not encrypted

tests/test_encryption.py

@@ -3,8 +3,9 @@
 import pytest
 
 import PyPDF2
+from PyPDF2 import PdfReader
 from PyPDF2._encryption import CryptRC4
-from PyPDF2.errors import DependencyError
+from PyPDF2.errors import DependencyError, PdfReadError
 
 try:
  from Crypto.Cipher import AES # noqa: F401
@@ -153,3 +154,10 @@ def test_encrypt_decrypt_class(cryptcls):
  key = bytes(0 for _ in range(128)) # b"secret key"
  crypt = cryptcls(key)
  assert crypt.decrypt(crypt.encrypt(message)) == message
+
+
+def test_decrypt_not_decrypted_pdf():
+ path = os.path.join(RESOURCE_ROOT, "crazyones.pdf")
+ with pytest.raises(PdfReadError) as exc:
+ PdfReader(path, password="nonexistant")
+ assert exc.value.args[0] == "Not encrypted file"