public void GetGenerator()
{
var f = new Mock <IdGeneratorFactory>();
IdGeneratorFactoryExtensions.GetGenerator <string>(f.Object);
f.Verify(fc => fc.GetGenerator(It.Is <Type>(t => t == typeof(string))), Times.Once);
}
public static T GetNext <T>(this IdGeneratorFactory factory) => IdGeneratorFactoryExtensions.GetGenerator <T>(factory).GetNext <T>();
