public void EnergyUsed_WHEN_timeOn_positive_THEN_equals_wattage_times_hoursOn_dividedby_1000(TimeSpan timeOn,
int myWattage)
{
const int lumens = 500;
var expected = timeOn.TotalHours * myWattage / 1000; // EnergyUsed read in KwH.
LightbulbBase bulb = new TestBulb(lumens, myWattage);
var actual = bulb.EnergyUsed(timeOn);
Assert.Equal(expected, actual);
}
public void EnergyUsed_TenWattageFiveHours_PointZeroFiveKwh()
{
const int wattage = 10;
var timeOn = TimeSpan.FromHours(5);
var expected = wattage * timeOn.TotalHours / 1000;
LightbulbBase bulb = new TestBulb(500, wattage);
var actual = bulb.EnergyUsed(timeOn);
Assert.Equal(expected, actual);
}