it('should return tokenKey when found by symbol', () => {
   const tokenKeys = FilteredSearchTokenKeys.get();
   const result = FilteredSearchTokenKeys.searchBySymbol(tokenKeys[0].symbol);
   expect(result).toEqual(tokenKeys[0]);
 });
 it('should return null when symbol not found', () => {
   const tokenKey = FilteredSearchTokenKeys.searchBySymbol('notasymbol');
   expect(tokenKey === null).toBe(true);
 });