public void FindMinimum_SinX_ReturnsNegativePiOverTwo()
{
OneDimensionalFunction derivative = x => Math.Cos(x);
GradientDescentExtremaFinder extremaFinder = new GradientDescentExtremaFinder(derivative);
double initialGuess = 0;
var calculatedMinimum = extremaFinder.FindMinimum(initialGuess);
double expectedMinimum = -Math.PI / 2;
Assert.AreEqual(expectedMinimum, calculatedMinimum, Tolerance);
}
public void FindMinimum_XSquared_ReturnsZero()
{
OneDimensionalFunction derivative = x => 2 * x;
GradientDescentExtremaFinder extremaFinder = new GradientDescentExtremaFinder(derivative);
double initialGuess = 3;
var calculatedMinimum = extremaFinder.FindMinimum(initialGuess);
double expectedMinimum = 0;
Assert.AreEqual(expectedMinimum, calculatedMinimum, Tolerance);
}
