c# - How i can get context for testing a VideoViewModel (Xamarin,NUnitLite) -

i want test concrete implementation of abstract videoviewmodel on android. use vs 2013 nunitlite.

for create videoviewmodel instance need activity context

here constructor vor videoviewmodel:

    public videoviewmodelandroid(context context, ifilesystem filesystem)         : base(filesystem)     {         bool contextisactivity = context activity;         exceptionutil.throwif.isfalse(() => contextisactivity);          this.context = context;         this.videoview = (context activity).findviewbyid<videoview>(resource.id.videoview1); // returns null videoview         this.videoview.touch += videoview_touch; 

}

here create videoview

        context = mainactivity.con;         var view = new videoviewmodelandroid(context, filesystem); 

the context comes here:

[activity(label = "ids.droid.tests", mainlauncher = true, icon = "@drawable/icon")] public class mainactivity : testsuiteactivity {     public static context con;     protected override void oncreate(bundle bundle)     {         // tests can inside main assembly         addtest(assembly.getexecutingassembly());         // or in reference assemblies         // addtest (typeof (your.library.testclass).assembly);          // once called base.oncreate(), cannot add more assemblies.         base.oncreate(bundle);         //setcontentview(resource.layout.mainlayout);         con = this;     }  } 

i linked layout application , id represented in resource.designer.cs.

but retuns no view after call

this.videoview = (context activity).findviewbyid<videoview>(resource.id.videoview1); 

any idea resolve problem???

do need context or maybe mock it? if can mock use package(available through nuget):

github: https://github.com/moq/moq4

nuget: https://www.nuget.org/packages/moq/

but others stated in comment, using context in viewmodel isn't practice. reason viewmodel has platform independent. if wanted reuse viewmodel ios , winphone have problem context not existing on these platforms.