[英]NUnit+Moq Throwing Exception
被测代码如下。 view.QueryResultsGrid是一个System.Windows.Forms.DataGridView对象:
public void SelectCheckedChanged(object sender, EventArgs e)
{
view.QueryResultsGrid.SelectionMode = DataGridViewSelectionMode.ColumnHeaderSelect;
}
正在尝试测试:
private Mock<IQueryForm> mockWindow;
private QueryFormPresenter presenter;
/// <summary>
/// Runs ONCE prior to any tests running
/// </summary>
[TestFixtureSetUp]
public void TestFixtureSetUp()
{
//We're interested in testing the QueryFormPresenter class here, but we
//don't really care about the QueryForm window (view) since there is hardly any code in it.
//Therefore, we create a mock of the QueryForm view, and pass it to the QueryFormPresenter to use.
mockWindow = new Mock<IQueryForm>();
presenter = new QueryFormPresenter(mockWindow.Object);
}
[Test]
public void Moq_Is_Hard()
{
//Arrage
DataGridView d = new DataGridView();
mockWindow.SetupGet(x => x.QueryResultsGrid).Returns(d);
//Act
presenter.SelectCheckedChanged(null, null);
//Assert
//mockView.VerifyGet(x => x.QueryResultsGrid.SelectionMode, Times.AtMostOnce());
mockWindow.VerifySet(x => x.QueryResultsGrid.SelectionMode, Times.AtMostOnce());
}
如果在测试的代码行上放置一个断点,VS会告诉我:由于缺少get访问器,因此无法在该上下文中使用属性或索引器“ Presenter.IQueryForm.QueryResults”。 但是,在测试中,我认为我是在模拟程序上设置Get访问器,因此我不理解该消息。 最后,NUnit提供了一个“对象引用未设置为对象实例”的异常。
任何帮助是极大的赞赏!
安迪
那么您的代码正在做的是从模拟中获取DataGridView,然后在其上设置SelectionMode属性。 DataGridView的实际实现不受Mocks的控制,因此它无法拦截SelectionMode的获取器和设置器。
问题之一(您可能已经发现)是DataGridView并不是真正可模拟的,因此您必须返回实际的实现,将所有属性存根并进行处理。
以下测试对我来说是合格的...
[Test]
public void SelectCheckedChanged_SetsModeToColumnHeaderSelect () {
//Arrange
//Mock the form to return a stubbed grid
Mock<IQueryForm> form = new Mock<IQueryForm>();
DataGridView grid = new DataGridView();
grid.SelectionMode = DataGridViewSelectionMode.CellSelect;
form.SetupGet(f => f.QueryResults).Returns(grid);
QueryFormPresenter presenter = new QueryFormPresenter(form.Object);
//Act
presenter.SelectCheckedChanged();
//Assert
form.VerifyGet(f => f.QueryResults);
Assert.AreEqual(DataGridViewSelectionMode.ColumnHeaderSelect,
grid.SelectionMode);
}
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