@Test
public void testIfParsesConstant() throws ParseException {
String expressionString = "1.0";
Polynomial parsedPoly = parser.parseString(expressionString);
assertEquals(parsedPoly, Polynomial.getSingularPolynomial());
String expressionString2 = "0.0";
Polynomial parsedPoly2 = parser.parseString(expressionString2);
assertEquals(parsedPoly2, Polynomial.getZeroPolynomial());
String expressionString3 = "-1.0";
Polynomial parsedPoly3 = parser.parseString(expressionString3);
assertEquals(parsedPoly3, new Polynomial(new Double[] {-1.0}));
}
public void testIfHandlesWhitespace() throws ParseException {
String expressionString = "x^2 + x + 1";
Polynomial parsedPoly = parser.parseString(expressionString);
assertEquals(parsedPoly, new Polynomial(new Double[] {1.0, 1.0, 1.0}));
String expressionString2 = "-x^2 + x + 1";
Polynomial parsedPoly2 = parser.parseString(expressionString2);
assertEquals(parsedPoly2, new Polynomial(new Double[] {-1.0, 1.0, 1.0}));
String expressionString3 = "1.0*x^2 + 1.0*x - 1.0";
Polynomial parsedPoly3 = parser.parseString(expressionString3);
assertEquals(parsedPoly3, new Polynomial(new Double[] {1.0, 1.0, -1.0}));
String expressionString4 = "-1.0 * x^2 - 1.0 * x + 5.0";
Polynomial parsedPoly4 = parser.parseString(expressionString4);
assertEquals(parsedPoly4, new Polynomial(new Double[] {-1.0, -1.0, 5.0}));
String expressionString5 = "-5.0 * x^2- 5.0*x-5.0";
Polynomial parsedPoly5 = parser.parseString(expressionString5);
assertEquals(parsedPoly5, new Polynomial(new Double[] {-5.0, -5.0, -5.0}));
}
@Test
public void testIfParsesSimpleExpressions() throws ParseException {
String expressionString = "x";
Polynomial parsedPoly = parser.parseString(expressionString);
assertEquals(parsedPoly, new Polynomial(new Double[] {1.0, 0.0}));
String expressionString2 = "-x";
Polynomial parsedPoly2 = parser.parseString(expressionString2);
assertEquals(parsedPoly2, new Polynomial(new Double[] {-1.0, 0.0}));
String expressionString3 = "1.0*x";
Polynomial parsedPoly3 = parser.parseString(expressionString3);
assertEquals(parsedPoly3, new Polynomial(new Double[] {1.0, 0.0}));
String expressionString4 = "-1.0*x";
Polynomial parsedPoly4 = parser.parseString(expressionString4);
assertEquals(parsedPoly4, new Polynomial(new Double[] {-1.0, 0.0}));
String expressionString5 = "-5.0*x";
Polynomial parsedPoly5 = parser.parseString(expressionString5);
assertEquals(parsedPoly5, new Polynomial(new Double[] {-5.0, 0.0}));
}
@Test(expected = ParseException.class)
public void testIfFailsOnMissingPlusAndMinusSigns() throws ParseException {
String expressionString4 = "-1.0*x^21.0*x+5.0";
parser.parseString(expressionString4);
}
@Test(expected = ParseException.class)
public void testIfFailsOnErroneousInput() throws ParseException {
String expressionString = "blargh";
parser.parseString(expressionString);
}