test: add a test to check an error is raised if configuration is not complete

tests/monkey.py

@@ -87,13 +87,19 @@ def gen_configs():
     config["acmednstiny"]["CSRFile"] = account_csr.name
     with open(accountAsDomain.name, 'w') as configfile:
         config.write(configfile)
-
+    
+    missingDNS = NamedTemporaryFile()
+    config["DNS"] = {}
+    with open(missingDNS.name, 'w') as configfile:
+        config.write(configfile)
+    
     return {
         "goodCName": goodCName,
         "dnsHostIP": dnsHostIP,
         "goodSAN": goodSAN,
         "weakKey": weakKey,
         "accountAsDomain": accountAsDomain,
+        "missingDNS": missingDNS,
         "key": {"accountkey": account_key,
                  "weakkey": weak_key,
                  "domainkey": domain_key},

tests/test_module.py

@@ -83,6 +83,14 @@ class TestModule(unittest.TestCase):
         self.assertIsInstance(result, ValueError)
         self.assertIn("Certificate public key must be different than account key", result.args[0])
 
+    def test_failure_notcompleted_configuration(self):
+        """ Configuration file have to be completed """
+        try:
+            result = acme_dns_tiny.main([CONFIGS['missingDNS'].name])
+        except Exception as e:
+            result = e
+        self.assertIsInstance(result, ValueError)
+        self.assertIn("Some required settings are missing.", result.args[0])
 
 if __name__ == "__main__":
     unittest.main()