@Test
public void testParseSmallTimesExpression() {
Expression parsedTimes = parser.parse("3*2");
assertTrue(
"Parsing a multiplication should return a TimesExpression...",
parsedTimes instanceof TimesExpression);
assertTrue(
"...with a LHS of type IntExpression ...",
((TimesExpression) parsedTimes).getLHS() instanceof IntExpression);
IntExpression lhs = (IntExpression) ((TimesExpression) parsedTimes).getLHS();
assertTrue(
"... and a RHS of type IntExpression.",
((TimesExpression) parsedTimes).getRHS() instanceof IntExpression);
IntExpression rhs = (IntExpression) ((TimesExpression) parsedTimes).getRHS();
assertEquals("Our LHS should have value 3", 3, lhs.getValue());
assertEquals("and our RHS should have value 2", 2, rhs.getValue());
}
@Test
public void testParseSmallPlusExpression() {
Expression parsedPlus = parser.parse("12+119");
assertTrue(
"parsing an int-plus-int should return a plus expression",
parsedPlus instanceof PlusExpression);
assertTrue(
"with a LHS of type IntExpression",
((PlusExpression) parsedPlus).getLHS() instanceof IntExpression);
IntExpression lhs = (IntExpression) ((PlusExpression) parsedPlus).getLHS();
assertTrue(
"and with a RHS of type IntExpression",
((PlusExpression) parsedPlus).getRHS() instanceof IntExpression);
IntExpression rhs = (IntExpression) ((PlusExpression) parsedPlus).getRHS();
assertEquals("our LHS should have value 12", 12, lhs.getValue());
assertEquals("our RHS should have value 119", 119, rhs.getValue());
}