asp.net mvc 3 - How to unit test modelbinder with ModelMetadata -

how unit test custom modelbinder?

here's code.

public class magicbinder : defaultmodelbinder     {          public override object bindmodel(controllercontext controllercontext, modelbindingcontext bindingcontext)         {             var boundmodelobject = base.bindmodel(controllercontext, bindingcontext);              var properties = bindingcontext.modeltype.getproperties().where(a => a.canwrite);             foreach (var propertyinfo in properties)             {                 object outvalue = null;                 bindingcontext.trygetvalue(propertyinfo.name, propertyinfo.declaringtype, out outvalue);                 propertyinfo.setvalue(boundmodelobject, outvalue, null);             }              return boundmodelobject;         }     } 

and here test script.

[testmethod] public void testfoobinding() {     var dict = new valueproviderdictionary(null)                    {                        {"number", new valueproviderresult("2", "2", null)},                        {"test", new valueproviderresult("12", "12", null)},                    };      var bindingcontext = new modelbindingcontext() { modelname = "foo", valueprovider = dict};      var target = new magicbinder();      foo result = (foo)target.bindmodel(null, bindingcontext); }  public class foo {     public int number { get; set; }     public int test { get; set; } } 

problem? in magicbinder, bindingcontext.model null. if try set bindingcontext.model = new foo(). exception saying deprecated, , should set modelmetadata.

so how construct modelmetadata? can't mocked.

try this:

[testmethod] public void testfoobinding() {     // arrange     var formcollection = new namevaluecollection      {         { "number", "2" },         { "test", "12" },     };      var valueprovider = new namevaluecollectionvalueprovider(formcollection, null);     var metadata = modelmetadataproviders.current.getmetadatafortype(null, typeof(foo));     var bindingcontext = new modelbindingcontext     {         modelname = "",         valueprovider = valueprovider,         modelmetadata = metadata     };     var controllercontext = new controllercontext();     var sut = new magicbinder();      // act         foo actual = (foo)sut.bindmodel(controllercontext, bindingcontext);      // assert     // todo: }