Reorganize unit test locations under tests/unittests (#1126)

This attempts to standardize unit test file location under test/unittests/
such that any source file located at cloudinit/path/to/file.py may have a
corresponding unit test file at test/unittests/path/to/test_file.py.

Noteworthy Comments:
====================
Four different duplicate test files existed:
test_{gpg,util,cc_mounts,cc_resolv_conf}.py
Each of these duplicate file pairs has been merged together. This is a
break in git history for these files.

The test suite appears to have a dependency on test order. Changing test
order causes some tests to fail. This should be rectified, but for now
some tests have been modified in
tests/unittests/config/test_set_passwords.py.

A helper class name starts with "Test" which causes pytest to try
executing it as a test case, which then throws warnings "due to Class
having __init__()".  Silence by changing the name of the class.

# helpers.py is imported in many test files, import paths change
cloudinit/tests/helpers.py -> tests/unittests/helpers.py

# Move directories:
cloudinit/distros/tests -> tests/unittests/distros
cloudinit/cmd/devel/tests -> tests/unittests/cmd/devel
cloudinit/cmd/tests -> tests/unittests/cmd/
cloudinit/sources/helpers/tests -> tests/unittests/sources/helpers
cloudinit/sources/tests -> tests/unittests/sources
cloudinit/net/tests -> tests/unittests/net
cloudinit/config/tests -> tests/unittests/config
cloudinit/analyze/tests/ -> tests/unittests/analyze/

# Standardize tests already in tests/unittests/
test_datasource -> sources
test_distros -> distros
test_vmware -> sources/vmware
test_handler -> config        # this contains cloudconfig module tests
test_runs -> runs

1 files changed, 68 insertions, 0 deletions

diff --git a/tests/unittests/distros/test_photon.py b/tests/unittests/distros/test_photon.py
new file mode 100644
index 00000000..3858f723
--- /dev/null
+++ b/tests/unittests/distros/test_photon.py
@@ -0,0 +1,68 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+
+from . import _get_distro
+from cloudinit import util
+from tests.unittests.helpers import mock
+from tests.unittests.helpers import CiTestCase
+
+SYSTEM_INFO = {
+    'paths': {
+        'cloud_dir': '/var/lib/cloud/',
+        'templates_dir': '/etc/cloud/templates/',
+    },
+    'network': {'renderers': 'networkd'},
+}
+
+
+class TestPhoton(CiTestCase):
+    with_logs = True
+    distro = _get_distro('photon', SYSTEM_INFO)
+    expected_log_line = 'Rely on PhotonOS default network config'
+
+    def test_network_renderer(self):
+        self.assertEqual(self.distro._cfg['network']['renderers'], 'networkd')
+
+    def test_get_distro(self):
+        self.assertEqual(self.distro.osfamily, 'photon')
+
+    @mock.patch("cloudinit.distros.photon.subp.subp")
+    def test_write_hostname(self, m_subp):
+        hostname = 'myhostname'
+        hostfile = self.tmp_path('previous-hostname')
+        self.distro._write_hostname(hostname, hostfile)
+        self.assertEqual(hostname, util.load_file(hostfile))
+
+        ret = self.distro._read_hostname(hostfile)
+        self.assertEqual(ret, hostname)
+
+        m_subp.return_value = (None, None)
+        hostfile += 'hostfile'
+        self.distro._write_hostname(hostname, hostfile)
+
+        m_subp.return_value = (hostname, None)
+        ret = self.distro._read_hostname(hostfile)
+        self.assertEqual(ret, hostname)
+
+        self.logs.truncate(0)
+        m_subp.return_value = (None, 'bla')
+        self.distro._write_hostname(hostname, None)
+        self.assertIn('Error while setting hostname', self.logs.getvalue())
+
+    @mock.patch('cloudinit.net.generate_fallback_config')
+    def test_fallback_netcfg(self, m_fallback_cfg):
+
+        key = 'disable_fallback_netcfg'
+        # Don't use fallback if no setting given
+        self.logs.truncate(0)
+        assert(self.distro.generate_fallback_config() is None)
+        self.assertIn(self.expected_log_line, self.logs.getvalue())
+
+        self.logs.truncate(0)
+        self.distro._cfg[key] = True
+        assert(self.distro.generate_fallback_config() is None)
+        self.assertIn(self.expected_log_line, self.logs.getvalue())
+
+        self.logs.truncate(0)
+        self.distro._cfg[key] = False
+        assert(self.distro.generate_fallback_config() is not None)
+        self.assertNotIn(self.expected_log_line, self.logs.getvalue())