tests: move login tests from doctest to separate file

This way we can skip ENOENT (which happens in containers).
While at it, let's extend the tests a bit, so that we at least
call all functions and check the type of the return value.

Also, drop '.nspawn' from the machine name, nspawn doesn't
use that suffix any more.

3 files changed, 54 insertions, 4 deletions

diff --git a/docs/login.rst b/docs/login.rst
index 2ee807c..23204e0 100644
--- a/docs/login.rst
+++ b/docs/login.rst
@@ -17,12 +17,12 @@ external event loop:
 
   >>> import select
   >>> from systemd import login
-  >>> m = login.Monitor("machine")
+  >>> m = login.Monitor("machine")        # doctest: +SKIP
   >>> p = select.poll()
-  >>> p.register(m, m.get_events())
+  >>> p.register(m, m.get_events())       # doctest: +SKIP
   >>> login.machine_names()               # doctest: +SKIP
   []
   >>> p.poll()                            # doctest: +SKIP
   [(3, 1)]
   >>> login.machine_names()               # doctest: +SKIP
-  ['fedora-19.nspawn']
+  ['fedora-25']
diff --git a/setup.py b/setup.py
index 1acfbc5..70c2780 100644
--- a/setup.py
+++ b/setup.py
@@ -92,7 +92,9 @@ setup (name = 'systemd-python',
            'License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)',
            ],
        py_modules = ['systemd.journal', 'systemd.daemon',
-                     'systemd.test.test_daemon', 'systemd.test.test_journal'],
+                     'systemd.test.test_daemon',
+                     'systemd.test.test_journal',
+                     'systemd.test.test_login'],
        ext_modules = [_journal,
                       _reader,
                       _daemon,
diff --git a/systemd/test/test_login.py b/systemd/test/test_login.py
new file mode 100644
index 0000000..afb5f45
--- /dev/null
+++ b/systemd/test/test_login.py
@@ -0,0 +1,48 @@
+from __future__ import print_function
+import select
+import contextlib
+import errno
+
+from systemd import login
+
+import pytest
+
+@contextlib.contextmanager
+def skip_oserror(code):
+    try:
+        yield
+    except (OSError, IOError) as e:
+        if e.errno == code:
+            pytest.skip()
+        raise
+
+def test_seats():
+    # just check that we get some sequence back
+    with skip_oserror(errno.ENOENT):
+        seats = login.seats()
+        assert len(seats) >= 0
+
+def test_sessions():
+    with skip_oserror(errno.ENOENT):
+        sessions = login.sessions()
+        assert len(sessions) >= 0
+
+def test_machine_names():
+    with skip_oserror(errno.ENOENT):
+        machine_names = login.machine_names()
+        assert len(machine_names) >= 0
+
+def test_uids():
+    with skip_oserror(errno.ENOENT):
+        uids = login.uids()
+        assert len(uids) >= 0
+
+def test_monitor():
+    p = select.poll()
+
+    with skip_oserror(errno.ENOENT):
+        m = login.Monitor("machine")
+        p.register(m, m.get_events())
+        login.machine_names()
+        p.poll(1)
+        login.machine_names()