encryption_tests: make robust against bad default keyrings

If the default keyring is not pristine, the test suite fails with errors
related to gpg not being able to read the keyring. Since the symmetric
encryption tests can use an empty keyring, make an empty directory for
it.

Signed-off-by: Ben Boeckel <mathstuf@gmail.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/obnamlib/encryption_tests.py b/obnamlib/encryption_tests.py
index c695b731..86fd2fa0 100644
--- a/obnamlib/encryption_tests.py
+++ b/obnamlib/encryption_tests.py
@@ -37,6 +37,12 @@ class SymmetricEncryptionTests(unittest.TestCase):
     # In these tests, we care about making sure we use the tools right,
     # not that the tools themselves work right.
 
+    def setUp(self):
+        self.gpghome = tempfile.mkdtemp()
+
+    def tearDown(self):
+        shutil.rmtree(self.gpghome)
+
     def test_generates_key_of_correct_length(self):
         numbits = 16
         key = obnamlib.generate_symmetric_key(numbits, filename='/dev/zero')
@@ -50,14 +56,17 @@ class SymmetricEncryptionTests(unittest.TestCase):
     def test_encrypts_into_different_string_than_cleartext(self):
         cleartext = 'hello world'
         key = 'sekr1t'
-        encrypted = obnamlib.encrypt_symmetric(cleartext, key)
+        encrypted = obnamlib.encrypt_symmetric(cleartext, key,
+                                               gpghome=self.gpghome)
         self.assertNotEqual(cleartext, encrypted)
 
     def test_encrypt_decrypt_round_trip(self):
         cleartext = 'hello, world'
         key = 'sekr1t'
-        encrypted = obnamlib.encrypt_symmetric(cleartext, key)
-        decrypted = obnamlib.decrypt_symmetric(encrypted, key)
+        encrypted = obnamlib.encrypt_symmetric(cleartext, key,
+                                               gpghome=self.gpghome)
+        decrypted = obnamlib.decrypt_symmetric(encrypted, key,
+                                               gpghome=self.gpghome)
         self.assertEqual(decrypted, cleartext)