python/tests: try to decrypt and verify new test data

* lang/python/tests/t-decrypt.py: test decryption of cipher-3.asc and
cipher-no-sig.asc
* lang/python/tests/t-decrypt-verify.py: test decryption and
verification of cipher-3.asc and cipher-no-sig.asc

--

note that this introduces a failed test -- decrypt-verify.py
misbehaves on cipher-3.asc by throwing a BadSignature even though

GnuPG-bug-id: 4276
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

lang/python/tests/t-decrypt-verify.py

@@ -75,3 +75,14 @@ with gpg.Context() as c:
         assert e.missing[0] == bob
     else:
         assert False, "Expected an error, got none"
+
+    plaintext, _, verify_result = c.decrypt(open(support.make_filename("cipher-no-sig.asc")))
+    assert len(plaintext) > 0
+    assert len(verify_result.signatures) == 0
+    assert plaintext.find(b'Viscosity Dispersal Thimble Saturday Flaxseed Deflected') >= 0, \
+        'unsigned Plaintext was not found'
+
+    plaintext, _, verify_result = c.decrypt(open(support.make_filename("cipher-3.asc")))
+    assert len(plaintext) > 0
+    assert plaintext.find(b'Reenact Studied Thermos Bonehead Unclasp Opposing') >= 0, \
+        'second Plaintext not found'

lang/python/tests/t-decrypt.py

@@ -42,3 +42,13 @@ with gpg.Context() as c:
     assert len(plaintext) > 0
     assert plaintext.find(b'Wenn Sie dies lesen k') >= 0, \
         'Plaintext not found'
+
+    plaintext, _, _ = c.decrypt(open(support.make_filename("cipher-3.asc")), verify=False)
+    assert len(plaintext) > 0
+    assert plaintext.find(b'Reenact Studied Thermos Bonehead Unclasp Opposing') >= 0, \
+        'second Plaintext not found'
+
+    plaintext, _, _ = c.decrypt(open(support.make_filename("cipher-no-sig.asc")), verify=False)
+    assert len(plaintext) > 0
+    assert plaintext.find(b'Viscosity Dispersal Thimble Saturday Flaxseed Deflected') >= 0, \
+        'third Plaintext was not found'