svoid test_regexp_integer_minDigits() {
  testFunctionValues_twoArgs(func(int minDigits, S s) {
    regexpMatches(regexp_integer_minDigits(minDigits), s)
  },
    pair(3, "abc"), false,
    pair(3, ""), false,
    pair(3, "1"), false,
    pair(3, "12"), false,
    pair(3, "123"), true,
    pair(3, "1234"), true,
    pair(2, "43"), true,
    pair(2, "435"), true);
}

Began life as a copy of #1023984