Dns update (#1393)

* Improvements to DNS validator to include IPv6 (#1312)

* improvements to DNS validator to include IPv6

* fixed the DNS validators

* updated per suggestions

* Update const.py

* Update dns.py

* Update validate.py

* Update validate.py

* Update dns.py

* Update test_validate.py

* Update validate.py

* Cleanup

* Don't set default DNS server as default

* Remove update local resolver

* Fix lint

tests/test_validate.py

@@ -0,0 +1,67 @@
+"""Test validators."""
+
+import hassio.validate
+import voluptuous.error
+import pytest
+
+GOOD_V4 = [
+    "dns://10.0.0.1",  # random local
+    "dns://254.254.254.254",  # random high numbers
+    "DNS://1.1.1.1",  # cloudflare
+    "dns://9.9.9.9",  # quad-9
+]
+GOOD_V6 = [
+    "dns://2606:4700:4700::1111",  # cloudflare
+    "DNS://2606:4700:4700::1001",  # cloudflare
+]
+BAD = ["hello world", "https://foo.bar", "", "dns://example.com"]
+
+
+async def test_dns_url_v4_good():
+    """ tests the DNS validator with known-good ipv6 DNS URLs """
+    for url in GOOD_V4:
+        assert hassio.validate.dns_url(url)
+
+
+async def test_dns_url_v6_good():
+    """ tests the DNS validator with known-good ipv6 DNS URLs """
+    for url in GOOD_V6:
+        assert hassio.validate.dns_url(url)
+
+
+async def test_dns_server_list_v4():
+    """ test a list with v4 addresses """
+    assert hassio.validate.dns_server_list(GOOD_V4)
+
+
+async def test_dns_server_list_v6():
+    """ test a list with v6 addresses """
+    assert hassio.validate.dns_server_list(GOOD_V6)
+
+
+async def test_dns_server_list_combined():
+    """ test a list with both v4 and v6 addresses """
+    combined = GOOD_V4 + GOOD_V6
+    # test the matches
+    assert hassio.validate.dns_server_list(combined)
+    # test max_length is OK still
+    assert hassio.validate.dns_server_list(combined)
+    # test that it fails when the list is too long
+    with pytest.raises(voluptuous.error.Invalid):
+        hassio.validate.dns_server_list(combined + combined + combined + combined)
+
+
+async def test_dns_server_list_bad():
+    """ test the bad list """
+    # test the matches
+    with pytest.raises(voluptuous.error.Invalid):
+        assert hassio.validate.dns_server_list(BAD)
+
+
+async def test_dns_server_list_bad_combined():
+    """ test the bad list, combined with the good """
+    combined = GOOD_V4 + GOOD_V6 + BAD
+
+    with pytest.raises(voluptuous.error.Invalid):
+        # bad list
+        assert hassio.validate.dns_server_list(combined)