integration_tests: implement citest tests run in Travis (#605)

Specifically:
* `apt_configure_sources_list`
* `ntp_servers`
* `set_password_list`
* `users_groups`

Although not currently run in Travis, `set_password_list_string` was
ported over alongside `set_password_list` (as `test_set_password`).

1 files changed, 57 insertions, 0 deletions

diff --git a/tests/integration_tests/modules/test_ntp_servers.py b/tests/integration_tests/modules/test_ntp_servers.py
new file mode 100644
index 00000000..4cad8926
--- /dev/null
+++ b/tests/integration_tests/modules/test_ntp_servers.py
@@ -0,0 +1,57 @@
+"""Integration test for the ntp module's ``servers`` functionality with ntp.
+
+This test specifies the use of the `ntp` NTP client, and ensures that the given
+NTP servers are configured as expected.
+
+(This is ported from ``tests/cloud_tests/testcases/modules/ntp_servers.yaml``.)
+"""
+import re
+
+import yaml
+import pytest
+
+USER_DATA = """\
+#cloud-config
+ntp:
+  ntp_client: ntp
+  servers:
+      - 172.16.15.14
+      - 172.16.17.18
+"""
+
+EXPECTED_SERVERS = yaml.safe_load(USER_DATA)["ntp"]["servers"]
+
+
+@pytest.mark.user_data(USER_DATA)
+class TestNtpServers:
+
+    def test_ntp_installed(self, class_client):
+        """Test that `ntpd --version` succeeds, indicating installation."""
+        result = class_client.execute("ntpd --version")
+        assert 0 == result.return_code
+
+    def test_dist_config_file_is_empty(self, class_client):
+        """Test that the distributed config file is empty.
+
+        (This test is skipped on all currently supported Ubuntu releases, so
+        may not actually be needed any longer.)
+        """
+        if class_client.execute("test -e /etc/ntp.conf.dist").failed:
+            pytest.skip("/etc/ntp.conf.dist does not exist")
+        dist_file = class_client.read_from_file("/etc/ntp.conf.dist")
+        assert 0 == len(dist_file.strip().splitlines())
+
+    def test_ntp_entries(self, class_client):
+        ntp_conf = class_client.read_from_file("/etc/ntp.conf")
+        for expected_server in EXPECTED_SERVERS:
+            assert re.search(
+                r"^server {} iburst".format(expected_server),
+                ntp_conf,
+                re.MULTILINE
+            )
+
+    def test_ntpq_servers(self, class_client):
+        result = class_client.execute("ntpq -p -w -n")
+        assert result.ok
+        for expected_server in EXPECTED_SERVERS:
+            assert expected_server in result.stdout