public void ValidDailyRateOfChangeIsCalculated()
{
var rate = AlgorithmHelperCalculations.RateOfChange(CurrentDga, PreviousDga, Gas.Hydrogen, new TimeUnits.Day());
var expectedGasRateOfChange = (CurrentDga.Hydrogen.Value - PreviousDga.Hydrogen.Value) / (365.0);
Assert.AreEqual(expectedGasRateOfChange, rate);
}
public void RateOfChangeReturnsNullWhenOneDgaIsMissing()
{
var rate1 = AlgorithmHelperCalculations.RateOfChange(null, PreviousDga, Gas.Hydrogen, new TimeUnits.Year());
var rate2 = AlgorithmHelperCalculations.RateOfChange(CurrentDga, null, Gas.Hydrogen, new TimeUnits.Year());
Assert.AreEqual(null, rate1);
Assert.AreEqual(null, rate2);
}
public void ValidYearlyRateOfChangeIsCalculated()
{
var rate = AlgorithmHelperCalculations.RateOfChange(CurrentDga, PreviousDga, Gas.Hydrogen, new TimeUnits.Year());
var expectedGasRateOfChange = (CurrentDga.Hydrogen.Value - PreviousDga.Hydrogen.Value) / (CurrentDga.SamplingDate.Year - PreviousDga.SamplingDate.Year);
Assert.AreEqual(expectedGasRateOfChange, rate);
}
public void NullGasRatioReturnedWhenDenominatorIsZero()
{
IMeasurement numGas = new GasMeasurement()
{
Value = 100, Unit = new ConcentrationUnits.PartsPerMillion()
};
IMeasurement denGas = new GasMeasurement()
{
Value = 0, Unit = new ConcentrationUnits.PartsPerMillion()
};
var ratio = AlgorithmHelperCalculations.GasRatio(numGas, denGas);
Assert.AreEqual(null, ratio);
}
public void ValidGasRatioIsCalculated()
{
IMeasurement numGas = new GasMeasurement()
{
Value = 100, Unit = new ConcentrationUnits.PartsPerMillion()
};
IMeasurement denGas = new GasMeasurement()
{
Value = 100, Unit = new ConcentrationUnits.PartsPerMillion()
};
var ratio = AlgorithmHelperCalculations.GasRatio(numGas, denGas);
Assert.AreEqual(1.0, ratio);
}
