public void FindRoot_QuadraticIncorrectIntialGuess_ReturnsRootWithinTolerance()
{
OneDimensionalFunction f = x => x * x - 4;
double lowerBound = -1;
double upperBound = 3;
BisectionSolver solver = new BisectionSolver(f, lowerBound, upperBound);
var root = solver.FindRoot();
Assert.IsTrue(Math.Abs(f(root)) < solver.Tolerance);
}
public void FindRoot_CosFunction_ReturnsRootWithinTolerance()
{
OneDimensionalFunction f = Math.Cos;
double lowerBound = -Math.PI / 2;
double upperBound = Math.PI;
BisectionSolver solver = new BisectionSolver(f, lowerBound, upperBound);
var root = solver.FindRoot();
Assert.IsTrue(Math.Abs(f(root)) < solver.Tolerance);
}
public void FindRoot_PolynomialLowerBoundIsZero_ReturnsExactRoot()
{
OneDimensionalFunction f = x => x * x - 4;
double lowerBound = -2;
double upperBound = 3;
BisectionSolver solver = new BisectionSolver(f, lowerBound, upperBound);
var root = solver.FindRoot();
Assert.AreEqual(lowerBound, root);
}