public void EmptyForecastSourcesAreNotAllowed()
{
var forecastSources = Unique.EmptyForecastSources();
const string expectedMessage = "At least one forecast source is required.";
var expectedValue = forecastSources;
Asserts.Exception <ArgumentOutOfRangeException>(
() => GetForecast(forecastSources),
e => {
Assert.IsTrue(e.Message.StartsWith(expectedMessage), $"{e.Message} does not start with {expectedMessage}");
CollectionAssert.AreEqual(expectedValue, (ICollection)e.ActualValue);
});
}