improve openbsd version in get_version

Author: tony

libtmux/common.py

@@ -408,14 +408,17 @@ def get_version():
     If tmux is built from git master, the version returned will be the latest
     version appended with -master, e.g. ``2.4-master``.
 
+    If using OpenBSD's base system tmux, the version will have ``-openbsd``
+    appended to the latest version, e.g. ``2.4-openbsd``.
+
     :returns: tmux version
     :rtype: :class:`distutils.version.LooseVersion`
     """
     proc = tmux_cmd('-V')
     if proc.stderr:
         if proc.stderr[0] == 'tmux: unknown option -- V':
             if sys.platform.startswith("openbsd"):  # openbsd has no tmux -V
-                return LooseVersion(TMUX_MAX_VERSION)
+                return LooseVersion('%s-openbsd' % TMUX_MAX_VERSION)
             raise exc.LibTmuxException(
                 'libtmux supports tmux %s and greater. This system'
                 ' is running tmux 1.3 or earlier.' % TMUX_MIN_VERSION

tests/test_common.py

@@ -45,7 +45,14 @@ class Hi(object):
         return Hi()
     monkeypatch.setattr(libtmux.common, 'tmux_cmd', mock_tmux_cmd)
     monkeypatch.setattr(sys, 'platform', 'openbsd 5.2')
-    assert get_version() == LooseVersion(TMUX_MAX_VERSION)
+    assert has_minimum_version()
+    assert has_gte_version(TMUX_MIN_VERSION)
+    assert has_gt_version(TMUX_MAX_VERSION), (
+        "Greater than the max-supported version"
+    )
+    assert '%s-openbsd' % TMUX_MAX_VERSION == get_version(), (
+        "Is the latest supported version with -openbsd appended"
+    )
 
 
 def test_get_version_too_low(monkeypatch):