public void CalculateNewValueTest()
{
// Arrange.
var fileValue = Mock.Create<IFileProcess>();
var updater = new FileFieldUpdater { ValueCalculator = (s, d) => fileValue };
// Act.
updater.CalculateNewValue(new DataTriggerSourceData(), Mock.Create<IEditableRoot>());
// Assert.
Assert.AreSame(fileValue, updater.NewValue);
// Arrange.
updater.ValueCalculator = (s, d) => "Invalid";
// Act / Assert.
TestsHelper.VerifyThrow<InvalidOperationException>(() => updater.CalculateNewValue(new DataTriggerSourceData(), Mock.Create<IEditableRoot>()));
}
