Moved the creation of signature files to setUp method.

Now the mixin class is able to create the files which are required to
add the signature, it will be usefull for TestNetworkcacheClient.

slapos/libnetworkcachetests.py

@@ -33,6 +33,8 @@ class LibNetworkCacheMixin(unittest.TestCase):
          '--organization-unit-name', 'Dev',
          '--common-name', 'R500.com',
          '--email', 'test@example.com')
+    self.option_dict = parseArgument(*self.signature_creation_argument_list)
+    self.cert_as_text = createPrivateKeyAndCertificateFile(**self.option_dict)
 
   def tearDown(self):
     ''' Remove the files which have been created during the test. '''
@@ -63,14 +65,13 @@ class GenerateSignatureScriptTest(LibNetworkCacheMixin):
     '''
       Check if the argument is properly set.
     '''
-    option_dict = parseArgument(*self.signature_creation_argument_list)
     size_argument_list = len(self.signature_creation_argument_list)/2
-    size_option_dict = len(option_dict)
+    size_option_dict = len(self.option_dict)
     self.assertEquals(size_argument_list, size_option_dict,
         "Argument list should have the same size of option dict.")
 
     # Assert if the values are equals.
-    for value in option_dict.values():
+    for value in self.option_dict.values():
       self.assertTrue(value in self.signature_creation_argument_list,\
           '%s is not in %s.' % (value, self.signature_creation_argument_list))
 
@@ -78,8 +79,5 @@ class GenerateSignatureScriptTest(LibNetworkCacheMixin):
     '''
       Check if key file and the certificate file are being created correctly.
     '''
-    option_dict = parseArgument(*self.signature_creation_argument_list)
-    cert_as_text = createPrivateKeyAndCertificateFile(**option_dict)
-
     self.assertTrue(os.path.exists(self.signature_certificate_file))
     self.assertTrue(os.path.exists(self.signature_private_key_file))