copy the context in carry_out_calculation

test/test_option_validator.py

@@ -34,6 +34,12 @@ def return_if_val(value):
         return ValueError('test error')
 
 
+def is_context(value, context):
+    context.cfgimpl_get_settings().remove('validator')
+    if not isinstance(context, Config):
+        raise ValueError('not context')
+
+
 def test_validator():
     opt1 = StrOption('opt1', '', validator=return_true, default='val')
     raises(ValueError, "StrOption('opt2', '', validator=return_false, default='val')")
@@ -54,6 +60,15 @@ def test_validator_params():
     raises(ValueError, "cfg.opt2 = 'val'")
 
 
+def test_validator_params_context():
+    opt1 = StrOption('opt1', '', validator=is_context, validator_params={'': ((None,),)}, default='val')
+    root = OptionDescription('root', '', [opt1])
+    cfg = Config(root)
+    assert 'validator' in cfg.cfgimpl_get_settings()
+    assert cfg.opt1 == 'val'
+    assert 'validator' in cfg.cfgimpl_get_settings()
+
+
 def test_validator_params_key():
     opt1 = StrOption('opt1', '', validator=return_true, validator_params={'param': ('yes',)}, default='val')
     raises(TypeError, "StrOption('opt2', '', validator=return_true, validator_params={'param_unknown': ('yes',)}, default='val')")