diff --git a/test/new_api/test_symlink.py b/test/new_api/test_symlink.py
new file mode 100644
index 0000000..7b5e468
--- /dev/null
+++ b/test/new_api/test_symlink.py
@@ -0,0 +1,164 @@
+# coding: utf-8
+from .autopath import do_autopath
+do_autopath()
+
+from tiramisu import BoolOption, StrOption, SymLinkOption, \
+    OptionDescription, MasterSlaves, Config, getapi
+from tiramisu.error import PropertiesOptionError, ConfigError
+from tiramisu.setting import groups, owners
+
+from py.test import raises
+
+
+def return_value():
+    pass
+
+
+#____________________________________________________________
+def test_symlink_option():
+    boolopt = BoolOption("b", "", default=False)
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription("opt", "",
+                              [linkopt, OptionDescription("s1", "", [boolopt])])
+    api = getapi(Config(descr))
+    assert api.option('s1.b').value.get() is False
+    api.option("s1.b").value.set(True)
+    api.option("s1.b").value.set(False)
+    assert api.option('s1.b').value.get() is False
+    assert api.option('c').value.get() is False
+    api.option('s1.b').value.set(True)
+    assert api.option('s1.b').value.get() is True
+    assert api.option('c').value.get() is True
+    api.option('s1.b').value.set(False)
+    assert api.option('s1.b').value.get() is False
+    assert api.option('c').value.get() is False
+
+
+def test_symlink_getproperties():
+    boolopt = BoolOption('b', '', default=True, properties=('test',))
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription('opt', '', [boolopt, linkopt])
+    api = getapi(Config(descr))
+    api.property.read_write()
+    assert boolopt.impl_getproperties() == linkopt.impl_getproperties() == {'test'}
+    assert boolopt.impl_has_callback() == linkopt.impl_has_callback() == False
+
+
+def test_symlink_getcallback():
+    boolopt = BoolOption('b', '', callback=return_value)
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription('opt', '', [boolopt, linkopt])
+    api = getapi(Config(descr))
+    api.property.read_write()
+    assert boolopt.impl_has_callback() == linkopt.impl_has_callback() == True
+    assert boolopt.impl_get_callback() == linkopt.impl_get_callback() == (return_value, {})
+
+
+def test_symlink_requires():
+    boolopt = BoolOption('b', '', default=True)
+    stropt = StrOption('s', '', requires=[{'option': boolopt,
+                                           'expected': False,
+                                           'action': 'disabled'}])
+    linkopt = SymLinkOption("c", stropt)
+    descr = OptionDescription('opt', '', [boolopt, stropt, linkopt])
+    api = getapi(Config(descr))
+    api.property.read_write()
+    assert api.option('b').value.get() is True
+    assert api.option('s').value.get() is None
+    assert api.option('c').value.get() is None
+    api.option('b').value.set(False)
+    #
+    props = []
+    try:
+        api.option('s').value.get()
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == {'disabled'}
+    #
+    props = []
+    try:
+        api.option('c').value.get()
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == {'disabled'}
+
+
+def test_symlink_multi():
+    boolopt = BoolOption("b", "", default=[False], multi=True)
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription("opt", "",
+                              [linkopt, OptionDescription("s1", "", [boolopt])])
+    api = getapi(Config(descr))
+    assert api.option('s1.b').value.get() == [False]
+    assert api.option('c').value.get() == [False]
+    api.option('s1.b').value.set([True])
+    assert api.option('s1.b').value.get() == [True]
+    assert api.option('c').value.get() == [True]
+    api.option('s1.b').value.set([False])
+    assert api.option('s1.b').value.get() == [False]
+    assert api.option('c').value.get() == [False]
+    api.option('s1.b').value.set([False, True])
+    assert api.option('s1.b').value.get() == [False, True]
+    assert api.option('c').value.get() == [False, True]
+    assert boolopt.impl_is_multi() is True
+    assert linkopt.impl_is_multi() is True
+
+
+def test_symlink_assign():
+    boolopt = BoolOption("b", "", default=False)
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription("opt", "",
+                              [linkopt, OptionDescription("s1", "", [boolopt])])
+    api = getapi(Config(descr))
+    raises(ConfigError, "api.option('c').value.set(True)")
+
+
+def test_symlink_owner():
+    boolopt = BoolOption("b", "", default=False)
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription("opt", "",
+                              [linkopt, OptionDescription("s1", "", [boolopt])])
+    api = getapi(Config(descr))
+    assert api.option('s1.b').owner.isdefault()
+    assert api.option('c').owner.isdefault()
+    api.option('s1.b').value.set(True)
+    assert not api.option('s1.b').owner.isdefault()
+    assert not api.option('c').owner.isdefault()
+
+
+def test_symlink_get_information():
+    boolopt = BoolOption("b", "", default=False)
+    linkopt = SymLinkOption("c", boolopt)
+    boolopt.impl_set_information('test', 'test')
+    assert boolopt.impl_get_information('test') == 'test'
+    assert linkopt.impl_get_information('test') == 'test'
+    boolopt.impl_set_information('test', 'test2')
+    assert boolopt.impl_get_information('test') == 'test2'
+    assert linkopt.impl_get_information('test') == 'test2'
+
+
+def test_symlink_master():
+    a = StrOption('a', "", multi=True)
+    ip_admin_eth0 = SymLinkOption('ip_admin_eth0', a)
+    netmask_admin_eth0 = StrOption('netmask_admin_eth0', "", multi=True)
+    raises(ValueError, "MasterSlaves('ip_admin_eth0', '', [ip_admin_eth0, netmask_admin_eth0])")
+
+
+def test_symlink_slaves():
+    a = StrOption('a', "", multi=True)
+    ip_admin_eth0 = StrOption('ip_admin_eth0', "ip réseau autorisé", multi=True)
+    netmask_admin_eth0 = SymLinkOption('netmask_admin_eth0', a)
+    raises(ValueError, "MasterSlaves('ip_admin_eth0', '', [ip_admin_eth0, netmask_admin_eth0])")
+
+
+#____________________________________________________________
+def test_symlink_dependency():
+    boolopt = BoolOption("b", "", default=False)
+    linkopt = SymLinkOption("c", boolopt)
+    descr = OptionDescription("opt", "",
+                              [linkopt, OptionDescription("s1", "", [boolopt])])
+    api = getapi(Config(descr))
+    assert api.option('s1.b').option.has_dependency() is False
+    assert api.option('c').option.has_dependency() is True
+    assert api.option('s1.b').option.has_dependency(False) is True
+    assert api.option('c').option.has_dependency(False) is False
diff --git a/tiramisu/config.py b/tiramisu/config.py
index 9fe3413..6d7403b 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -291,9 +291,9 @@ class SubConfig(object):
                                                                              self)
         if config_bag.option.impl_is_optiondescription() or \
                 isinstance(config_bag.option, SynDynOptionDescription):
-            raise TypeError(_("can't assign to an OptionDescription"))  # pragma: optional cover
+            raise ConfigError(_("can't assign to an OptionDescription"))  # pragma: optional cover
         elif config_bag.option.impl_is_symlinkoption():
-            raise TypeError(_("can't assign to a SymLinkOption"))
+            raise ConfigError(_("can't assign to a SymLinkOption"))
         else:
             path = self._get_subpath(name)
             if config_bag.setting_properties: