public void FindRoots_FirstTermIsZero_ReturnsCorrectAnswer()
{
double a = 0;
double b = 1;
double c = 3;
List <Complex> roots = QuadraticSolver.FindRoots(a, b, c);
Complex root = new Complex(-3, 0);
Assert.AreEqual(1, roots.Count);
Assert.IsTrue(roots.Exists(x => x == root));
}
public void FindRoots_ComplexRoots_ReturnsCorrectAnswer()
{
double a = 1;
double b = -2;
double c = 4;
List <Complex> roots = QuadraticSolver.FindRoots(a, b, c);
Complex root1 = new Complex(1, Math.Sqrt(3));
Complex root2 = new Complex(1, -Math.Sqrt(3));
Assert.AreEqual(2, roots.Count);
Assert.IsTrue(roots.Exists(x => x == root1));
Assert.IsTrue(roots.Exists(x => x == root2));
}
public void FindRoots_IdenticalRealRoots_ReturnsCorrectAnswer()
{
double a = 1;
double b = -4;
double c = 4;
List <Complex> roots = QuadraticSolver.FindRoots(a, b, c);
Complex root1 = new Complex(2, 0);
Complex root2 = new Complex(2, 0);
Assert.AreEqual(2, roots.Count);
Assert.IsTrue(roots.Exists(x => x == root1));
Assert.IsTrue(roots.Exists(x => x == root2));
}