support cache consistencies + no consistencies for a symlink + test

test/test_option_consistency.py

@@ -4,7 +4,7 @@ from py.test import raises
 from tiramisu.setting import owners, groups
 from tiramisu.config import Config
 from tiramisu.option import IPOption, NetworkOption, NetmaskOption, IntOption,\
-    OptionDescription
+    SymLinkOption, OptionDescription
 
 
 def test_consistency_not_equal():
@@ -22,6 +22,16 @@ def test_consistency_not_equal():
     c.b = 2
 
 
+def test_consistency_not_equal_symlink():
+    a = IntOption('a', '')
+    b = IntOption('b', '')
+    c = SymLinkOption('c', a)
+    od = OptionDescription('od', '', [a, b, c])
+    a.impl_add_consistency('not_equal', b)
+    c = Config(od)
+    assert set(od._consistencies.keys()) == set([a, b])
+
+
 def test_consistency_not_equal_multi():
     a = IntOption('a', '', multi=True)
     b = IntOption('b', '', multi=True)