@Test
void singleValue() {

    Token stringValue = parser.parse("\"text\"");
    assertThat(stringValue).isInstanceOf(ValueToken.class);
    assertEquals("\"text\"", ((ValueToken) stringValue).value);
    Token numberValue = parser.parse("12.00");
    assertThat(numberValue).isInstanceOf(ValueToken.class);
    assertEquals("12.00", ((ValueToken) numberValue).value);
}