[core/theme] Add preparatory work for themes

Add two new parameters: theme and iconset

Add a placeholder class core.theme.Theme, an instance of which is passed
in to the i3 output object (which is the only object that should ever
have need of the theme, hopefully).

tests/core/test_config.py

@@ -4,19 +4,18 @@ import core.config
 
 class config(unittest.TestCase):
     def setUp(self):
-        self._someModules = [ 'b', 'x', 'a' ]
-        self._moreModules = [ 'this', 'module', 'here' ]
-
-    def tearDown(self):
-        pass
+        self.someModules = [ 'b', 'x', 'a' ]
+        self.moreModules = [ 'this', 'module', 'here' ]
+        self.someTheme = 'some-theme'
+        self.someIconset = 'some-iconset'
 
     def test_module(self):
-        cfg = core.config.Config([ '-m' ] + self._someModules)
-        self.assertEqual(self._someModules, cfg.modules())
+        cfg = core.config.Config([ '-m' ] + self.someModules)
+        self.assertEqual(self.someModules, cfg.modules())
 
     def test_module_ordering_maintained(self):
-        cfg = core.config.Config([ '-m' ] + self._someModules + [ '-m' ] + self._moreModules)
-        self.assertEqual(self._someModules + self._moreModules, cfg.modules())
+        cfg = core.config.Config([ '-m' ] + self.someModules + [ '-m' ] + self.moreModules)
+        self.assertEqual(self.someModules + self.moreModules, cfg.modules())
 
     def test_default_interval(self):
         cfg = core.config.Config([])
@@ -30,4 +29,20 @@ class config(unittest.TestCase):
         cfg = core.config.Config([ '-p', 'interval=0.5'])
         self.assertEqual(0.5, cfg.interval())
 
+    def test_default_theme(self):
+        cfg = core.config.Config([])
+        self.assertEqual('default', cfg.theme())
+
+    def test_theme(self):
+        cfg = core.config.Config(['-t', self.someTheme])
+        self.assertEqual(self.someTheme, cfg.theme())
+
+    def test_default_iconset(self):
+        cfg = core.config.Config([])
+        self.assertEqual('auto', cfg.iconset())
+
+    def test_iconset(self):
+        cfg = core.config.Config(['-i', self.someIconset])
+        self.assertEqual(self.someIconset, cfg.iconset())
+
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