package api

import (
	"strings"
	"testing"
)

func TestValidAuthorParam(t *testing.T) {
	cases := []struct {
		name string
		in   string
		want bool
	}{
		{"slug", "jane-doe", true},
		{"dotted login", "jan.kowalski", true},
		{"at sign", "a@b", true},
		{"max bytes", strings.Repeat("a", 255), true},
		{"multibyte", "zażółć", true},
		{"empty", "", false},
		{"whitespace only", strings.TrimSpace("   \t "), false},
		{"over max bytes", strings.Repeat("a", 256), false},
		{"nul byte", "a\x00b", false},
		{"newline", "a\nb", false},
		{"tab", "a\tb", false},
		{"invalid utf8", "\xff", false},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := validAuthorParam(tc.in); got != tc.want {
				t.Fatalf("validAuthorParam(%q) = %v, want %v", tc.in, got, tc.want)
			}
		})
	}
}