c# - 单元测试 NotifyPropertyChanged()

Question

测试此属性的最佳方法是什么:

  public string ThreadId {
        get { return _threadId; }
        set {
            _threadId = value;
            NotifyPropertyChanged();
        }
    }

到目前为止我有这个测试:

    [Fact]
    public void ThreadIdTest() {
        compassLogData.ThreadId = "[11]";
        const string expected = "[11]";
        string actual = compassLogData.ThreadId;
        Assert.Equal(expected, actual);
    }

但我需要一个测试 NotifyPropertyChanged() 用于更新用户界面。

Answer 1

一个简单的方法是这样做:

var notified = false;
compassLogData.PropertyChanged += (s, e) =>
{
    if(e.PropertyName == "ThreadId")
        notified = true;
};

compassLogData.ThreadId = "[11]";
Assert.True(notified);