public void TestAddUnlikeTerms()
{
string augend = "X^2";
string addend = "6";
string expected = "X^2 + 6";
MultivariatePolynomial polyAugend = MultivariatePolynomial.Parse(augend);
MultivariatePolynomial polyAddend = MultivariatePolynomial.Parse(addend);
MultivariatePolynomial sum = MultivariatePolynomial.Add(polyAugend, polyAddend);
string actual = sum.ToString();
TestContext.WriteLine($"Expected: \"{expected}\"; Actual: \"{actual}\"");
Assert.AreEqual(expected, actual, $"Test of: MultivariatePolynomial.Add({augend}, {addend});");
}