public void GetAllCommodities_ShouldReturnAllValidValues_UnderAllConditions()
{
// Arrange & Act
Commodity[] output = CUT.GetAllCommodities().ToArray();
// Assert
output.ShouldNotBeNull();
output.ShouldNotBeEmpty();
output.ShouldContain(Commodity.Electric);
output.ShouldContain(Commodity.Gas);
output.ShouldContain(Commodity.Solar);
}
