roman: fix the number range

roman/roman.go

@@ -3,7 +3,7 @@ package roman
 import "strings"
 
 type RomanNumeral struct {
-	Value  int
+	Value  uint16
 	Symbol string
 }
 
@@ -24,7 +24,7 @@ var allRomanNumerals = []RomanNumeral{
 	{1, "I"},
 }
 
-func ConvertToRoman(arabic int) string {
+func ConvertToRoman(arabic uint16) string {
 	var converted strings.Builder
 	for _, numeral := range allRomanNumerals {
 		for arabic >= numeral.Value {
@@ -36,8 +36,8 @@ func ConvertToRoman(arabic int) string {
 	return converted.String()
 }
 
-func ConvertToArabic(roman string) int {
-	var converted int
+func ConvertToArabic(roman string) uint16 {
+	var converted uint16
 	for _, numeral := range allRomanNumerals {
 		for strings.HasPrefix(roman, numeral.Symbol) {
 			converted += numeral.Value

roman/roman_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 var cases = []struct {
-	Arabic int
+	Arabic uint16
 	Roman  string
 }{
 	{Arabic: 1, Roman: "I"},
@@ -68,13 +68,18 @@ func TestConvertingToArabic(t *testing.T) {
 }
 
 func TestPropertiesOfConversion(t *testing.T) {
-	assertion := func(arabic int) bool {
+	assertion := func(arabic uint16) bool {
+		if arabic > 3999 {
+			return true
+		}
 		roman := ConvertToRoman(arabic)
 		fromRoman := ConvertToArabic(roman)
 		return fromRoman == arabic
 	}
 
-	if err := quick.Check(assertion, nil); err != nil {
+	if err := quick.Check(assertion, &quick.Config{
+		MaxCount: 1000,
+	}); err != nil {
 		t.Error("failed checks", err)
 	}
 }