fix tests when run without a tty (fixes erikrose#25)

blessings/__init__.py

@@ -448,7 +448,7 @@ def __new__(cls):
         new = unicode.__new__(cls, u'')
         return new
 
-    def __call__(self, arg):
+    def __call__(self, arg, *extra_args):
         if isinstance(arg, int):
             return u''
         return arg  # TODO: Force even strs in Python 2.x to be unicodes? Nah. How would I know what encoding to use to convert it?

blessings/tests.py

@@ -44,6 +44,8 @@ def test_capability():
 
     """
     t = TestTerminal()
+    if not t.is_a_tty:
+        raise SkipTest
     sc = unicode_cap('sc')
     eq_(t.save, sc)
     eq_(t.save, sc)  # Make sure caching doesn't screw it up.
@@ -64,7 +66,7 @@ def test_capability_with_forced_tty():
 
 def test_parametrization():
     """Test parametrizing a capability."""
-    eq_(TestTerminal().cup(3, 4), unicode_parm('cup', 3, 4))
+    eq_(TestTerminal(force_styling=True).cup(3, 4), unicode_parm('cup', 3, 4))
 
 
 def height_and_width():
@@ -143,7 +145,7 @@ def on_color(num):
 
     # Avoid testing red, blue, yellow, and cyan, since they might someday
     # change depending on terminal type.
-    t = TestTerminal()
+    t = TestTerminal(force_styling=True)
     eq_(t.white, color(7))
     eq_(t.green, color(2))  # Make sure it's different than white.
     eq_(t.on_black, on_color(0))
@@ -247,7 +249,7 @@ def test_nice_formatting_errors():
 def test_init_descriptor_always_initted():
     """We should be able to get a height and width even on no-tty Terminals."""
     t = Terminal(stream=StringIO())
-    eq_(type(t.height), int)
+    assert isinstance(t.height, int) or t.height is None
 
 
 def test_force_styling_none():