beefing up some testing for new functions

tests/test_utils.py

@@ -2,6 +2,7 @@
 from __future__ import absolute_import, division, print_function
 
 import os
+import stat
 import uuid
 import unittest
 from tempfile import NamedTemporaryFile as ntf
@@ -11,6 +12,51 @@ from tldptesttools import TestToolsFilesystem
 # -- SUT
 from tldp.utils import makefh, which, execute
 from tldp.utils import statfiles, stem_and_ext
+from tldp.utils import arg_isexecutable, isexecutable
+from tldp.utils import arg_isreadablefile, isreadablefile
+from tldp.utils import arg_isdirectory
+from tldp.utils import arg_isloglevel
+
+
+class Test_isexecutable_and_friends(unittest.TestCase):
+
+    def test_isexecutable(self):
+        f = ntf(prefix='executable-file')
+        self.assertFalse(isexecutable(f.name))
+        mode = stat.S_IXUSR | stat.S_IRUSR | stat.S_IWUSR
+        os.chmod(f.name, mode)
+        self.assertTrue(isexecutable(f.name))
+
+    def test_arg_isexecutable(self):
+        f = ntf(prefix='executable-file')
+        self.assertIsNone(arg_isexecutable(f.name))
+        mode = stat.S_IXUSR | stat.S_IRUSR | stat.S_IWUSR
+        os.chmod(f.name, mode)
+        self.assertEqual(f.name, arg_isexecutable(f.name))
+
+
+class Test_isreadablefile_and_friends(unittest.TestCase):
+
+    def test_isreadablefile(self):
+        f = ntf(prefix='readable-file')
+        self.assertTrue(isreadablefile(f.name))
+        os.chmod(f.name, 0)
+        self.assertFalse(isreadablefile(f.name))
+
+    def test_arg_isreadablefile(self):
+        f = ntf(prefix='readable-file')
+        self.assertEquals(f.name, arg_isreadablefile(f.name))
+        os.chmod(f.name, 0)
+        self.assertIsNone(arg_isreadablefile(f.name))
+
+
+class Test_arg_isloglevel(unittest.TestCase):
+
+    def test_arg_isloglevel_integer(self):
+        self.assertEquals(7, arg_isloglevel(7))
+        self.assertEquals(40, arg_isloglevel('frobnitz'))
+        self.assertEquals(20, arg_isloglevel('INFO'))
+        self.assertEquals(10, arg_isloglevel('DEBUG'))
 
 
 class Test_execute(TestToolsFilesystem):

tldp/utils.py

@@ -28,7 +28,7 @@ logger = getLogger()
 def firstfoundfile(locations):
     '''return the first existing file from a list of filenames (or None)'''
     for option in locations:
-        if os.path.isfile(option):
+        if isreadablefile(option):
             return option
     return None
 
@@ -40,19 +40,19 @@ def arg_isloglevel(l):
         level = getattr(logging, l.upper(), None)
     try:
         logging.getLogger().setLevel(level)
-    except ValueError:
+    except (TypeError, ValueError):
         level = logging.ERROR
     return level
 
 
-def arg_isfile(f):
-    if os.path.exists(f):
+def arg_isreadablefile(f):
+    if isreadablefile(f):
         return f
     return None
 
 
 def arg_isdirectory(d):
-    if os.path.exists(d):
+    if os.path.isdir(d):
         return d
     return None
 
@@ -152,9 +152,14 @@ def execute(cmd, stdin=None, stdout=None, stderr=None,
     return result
 
 
-def isexecutable(fpath):
+def isexecutable(f):
     '''True if argument is executable'''
-    return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
+    return os.path.isfile(f) and os.access(f, os.X_OK)
+
+
+def isreadablefile(f):
+    '''True if argument is readable file'''
+    return os.path.isfile(f) and os.access(f, os.R_OK)
 
 
 def which(program):