add unittests

run_tests.sh

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+#!/bin/env bash
+
+pipenv run python -m unittest -bv test_dnsverify

test_dnsverify.py

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+#!/bin/env python
+
+'''
+    Unit tests for dnsverify
+'''
+
+import unittest
+
+from dnsverify import do_check
+from dnsverify import get_authoritative_ns
+from dnsverify import get_domains_from_yaml
+from dnsverify import verify_authoritative_ns
+from pylint.lint import Run
+from pylint.reporters import CollectingReporter
+
+class TestDnsVerify(unittest.TestCase):
+    def test_do_check(self):
+        '''
+            ... Test if checks acutally fail when an error occures.
+        '''
+        self.assertEqual(do_check(['puzzle.ch'], 
+                                  ['ns1.google.com'], 
+                                  verbose=False), 
+                                  False)
+    def test_get_authoritative_ns(self):
+        '''
+            ... Test if garbage queries trigger a stack trace.
+        '''
+        self.assertEqual(get_authoritative_ns('dinimer.lolwas'), [])
+    def test_get_domains_from_yaml(self):
+        '''
+            ... Test wheter missing files generate an empty list.
+        '''
+        self.assertEqual(get_domains_from_yaml(["notexist.yaml"]), [])
+    def test_verify_authoritative_ns(self):
+        '''
+            ... Test wheter false is returned when the ns does not match the list. And test if type errors are handeled correctly.
+        '''
+        self.assertEqual(verify_authoritative_ns('ns1.google.com', ['ns2.google.com']), False)
+        self.assertRaises(TypeError, verify_authoritative_ns, 123, ['123'])
+        self.assertRaises(TypeError, verify_authoritative_ns, "123", "123")
+
+    def test_pylint(self):
+        '''
+           ... Test wheter the coding style is acceptable.
+        '''
+        rep = CollectingReporter()
+        results = Run(['dnsverify.py', '-sn'], reporter=rep, exit=False)
+        score = results.linter.stats['global_note']
+        self.assertGreaterEqual(score, 8, "Pylint score to low. Fix your code.")