add tests and support for TmuxCommandNotFound

Author: tony

libtmux/common.py

@@ -127,6 +127,12 @@ class tmux_cmd(object):
 
     """:term:`tmux(1)` command via :py:mod:`subprocess`.
 
+    :param tmux_search_paths: Default PATHs to search tmux for, defaults to
+        ``default_paths`` used in :func:`which`.
+    :type tmux_search_path: list
+    :param append_env_path: Append environment PATHs to tmux search paths.
+    :type append_env_path: bool
+
     Usage::
 
         proc = tmux_cmd('new-session', '-s%' % 'my session')
@@ -150,8 +156,13 @@ class tmux_cmd(object):
     """
 
     def __init__(self, *args, **kwargs):
-
-        tmux_bin = which('tmux')
+        tmux_bin = which(
+            'tmux',
+            default_paths=kwargs.get('tmux_search_paths', [
+                '/bin', '/sbin', '/usr/bin', '/usr/sbin', '/usr/local/bin'
+            ]),
+            append_env_path=kwargs.get('append_env_path', True)
+        )
         if not tmux_bin:
             raise(exc.TmuxCommandNotFound)
 

tests/test_common.py

@@ -6,9 +6,9 @@
 import pytest
 
 from libtmux.common import (
-    has_required_tmux_version, which, session_check_name, is_version
+    has_required_tmux_version, which, session_check_name, is_version, tmux_cmd
 )
-from libtmux.exc import LibTmuxException, BadSessionName
+from libtmux.exc import LibTmuxException, BadSessionName, TmuxCommandNotFound
 
 version_regex = re.compile(r'([0-9]\.[0-9])|(master)')
 
@@ -61,10 +61,18 @@ def test_error_version_less_1_7():
 def test_which_no_bin_found(monkeypatch):
     monkeypatch.setenv("PATH", "/")
     assert which('top')
-    assert which('top', default_paths=['/'])
+    assert which('top', default_paths=[])
+    assert not which('top', default_paths=[], append_env_path=False)
     assert not which('top', default_paths=['/'], append_env_path=False)
 
 
+def test_tmux_cmd_raises_on_not_found(monkeypatch):
+    with pytest.raises(TmuxCommandNotFound):
+        tmux_cmd('-V', tmux_search_paths=[], append_env_path=False)
+
+    tmux_cmd('-V')
+
+
 @pytest.mark.parametrize("session_name,raises,exc_msg_regex", [
     ('', True, 'may not be empty'),
     (None, True, 'may not be empty'),