assertEquals("Test if symbols are equal", a, set.getSymbol(0));
assertEquals("Test if symbols are equal", B, set.getSymbol(3));
assertEquals("Test if symbols are equal", C, set.getSymbol(5));
assertEquals("Test if indices are equal", 0, set.indexOf(a));
assertEquals("Test if indices are equal", 4, set.indexOf(c));
SymbolSet set2 = new SymbolSet();
set2.addSymbol(a);