using System.ComponentModel; using System.Runtime.CompilerServices; namespace Xamarin.Forms.Core.UnitTests { class MockViewModel : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public MockViewModel(string text=null) { _text = text; } string _text; public virtual string Text { get { return _text; } set { if (_text == value) return; _text = value; OnPropertyChanged ("Text"); } } protected void OnPropertyChanged ([CallerMemberName] string propertyName = null) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs (propertyName)); } } }