public void OnPropertyChanged_Exception_LambdaExpression_IsNotMemberAccess()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
var e = Assert.Throws <ArgumentException>(() => obj.FirePropertyChangedWithLambda <int>(() => 42));
Assert.Equal("The argument must be a member access lambda expression.\r\nParameter name: propertyExpression", e.Message);
Assert.Equal("propertyExpression", e.ParamName);
}
public void OnPropertyChanged_Exception_LambdaExpression_ExpressionIsNull()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
var e = Assert.Throws <ArgumentNullException>(() => obj.FirePropertyChangedWithLambda <int>(null));
Assert.Equal("Value cannot be null.\r\nParameter name: propertyExpression", e.Message);
Assert.Equal("propertyExpression", e.ParamName);
}
public void OnPropertyChanged_FiresPropertyChangedEvent_LambdaExpression()
{
TestableNotifyPropertyChanged obj = new TestableNotifyPropertyChanged();
int propertyChangedCount = 0;
obj.PropertyChanged += (sender, e) =>
{
Assert.Equal(obj, sender);
Assert.Equal("MyProperty", e.PropertyName);
propertyChangedCount++;
};
obj.FirePropertyChangedWithLambda(() => obj.MyProperty);
Assert.Equal(1, propertyChangedCount);
}