lbc/domain/fizzbuzz_fuzz_test.go

package domain

import (
	"regexp"
	"strings"
	"testing"
)

func FuzzFizzBuzz(f *testing.F) {
	rx := regexp.MustCompile(strings.Join([]string{
		"invalid modulo parameters: ",
		"invalid string parameter: empty",
		"contains a RFC-3986 reserved character",
	}, "|"))
	target := func(t *testing.T, int1, int2, limit int, str1, str2 string) {
		fbs, err := FizzBuzz(int1, int2, limit, str1, str2)
		if err != nil && !rx.MatchString(err.Error()) {
			t.Fatalf("Unexpected error: %s", err)
		}
		if fbs == nil && err == nil {
			t.Fatalf("unexpected nil result")
		}
		if len(fbs) == 0 && err == nil {
			t.Fatal("unexpected empty result")
		}
	}
	f.Fuzz(target)
}