@Test
public void testMultiplyBySingularPolynomial() {
// Test singular case - multiplying by 1
Polynomial simplePoly = Polynomial.getSingularPolynomial();
String[] params = new String[] {"A", "B"}; // Ax^2 + Bx + C
ParametrisedPolynomial paramPoly1 = new ParametrisedPolynomial(params);
ParametrisedPolynomial resultPoly1 = paramPoly1.multiplyByPolynomial(simplePoly);
assertArrayEquals(new Double[] {1.0, 0.0}, resultPoly1.getParamValuesForDegreeAsArray(1));
assertArrayEquals(new Double[] {0.0, 1.0}, resultPoly1.getParamValuesForDegreeAsArray(0));
}
@Test
public void testMultiplyBySingleArgumentBinomial() {
// Let's multiply by x
Polynomial poly = Polynomial.getSingleArgumentPolynomialOfDegree(1);
String[] params = new String[] {"A", "B"}; // Ax^2 + Bx + C
ParametrisedPolynomial paramPoly1 = new ParametrisedPolynomial(params);
ParametrisedPolynomial resultPoly1 = paramPoly1.multiplyByPolynomial(poly);
assertArrayEquals(new Double[] {1.0, 0.0}, resultPoly1.getParamValuesForDegreeAsArray(2));
assertArrayEquals(new Double[] {0.0, 1.0}, resultPoly1.getParamValuesForDegreeAsArray(1));
assertArrayEquals(new Double[] {0.0, 0.0}, resultPoly1.getParamValuesForDegreeAsArray(0));
}