add unit test to check Contacts option is facultative

tests/config_factory.py

@@ -58,6 +58,16 @@ def generate_acme_dns_tiny_config():
     with open(goodCName.name, 'w') as configfile:
         config.write(configfile)
 
+    # Simple configuration with good options, without contacts field
+    account_key, domain_key, domain_csr, config = generate_config();
+    os.remove(domain_key)
+
+    config.remove_option("acmednstiny", "Contacts")
+
+    goodCNameWithoutContacts = NamedTemporaryFile(delete=False)
+    with open(goodCNameWithoutContacts.name, 'w') as configfile:
+        config.write(configfile)
+
     # Simple configuration without CSR in configuration (will be passed as argument)
     account_key, domain_key, domain_csr, config = generate_config();
     os.remove(domain_key)
@@ -170,6 +180,7 @@ def generate_acme_dns_tiny_config():
     return {
         # configs
         "goodCName": goodCName.name,
+        "goodCNameWithoutContacts": goodCNameWithoutContacts.name,
         "goodCNameWithoutCSR": goodCNameWithoutCSR.name,
         "wildCName": wildCName.name,
         "dnsHostIP": dnsHostIP.name,

tests/test_acme_dns_tiny.py

@@ -71,6 +71,19 @@ class TestACMEDNSTiny(unittest.TestCase):
         
         self.assertCertificateChain(certchain)
 
+    def test_success_cn_without_contacts(self):
+        """ Successfully issue a certificate via CN, but without Contacts field """
+        old_stdout = sys.stdout
+        sys.stdout = StringIO()
+
+        acme_dns_tiny.main([self.configs['goodCNameWithoutContacts'], "--verbose"])
+        certchain = sys.stdout.getvalue()
+
+        sys.stdout.close()
+        sys.stdout = old_stdout
+
+        self.assertCertificateChain(certchain)
+
     def test_success_cn_with_csr_option(self):
         """ Successfully issue a certificate using CSR option outside from the config file"""
         old_stdout = sys.stdout