package main

import (
	"strings"
	"testing"
)

func TestCheckPasswdConstraint(t *testing.T) {
	tests := []struct {
		name    string
		pass    string
		wantErr bool
	}{
		{"valid password", "Correct1Horse", false},
		{"too short", "Short1A", true},
		{"exactly 12 chars", "Abcdefgh1234", false},
		{"no uppercase", "correct1horse", true},
		{"no lowercase", "CORRECT1HORSE", true},
		{"no digit", "CorrectHorse!", true},
		{"exactly 128 chars", strings.Repeat("a", 126) + "A1", false},
		{"129 chars is too long", strings.Repeat("a", 127) + "A1", true},
		{"very long password", strings.Repeat("Aa1", 100), true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := checkPasswdConstraint(tt.pass)
			if (err != nil) != tt.wantErr {
				t.Errorf("checkPasswdConstraint(%q) error = %v, wantErr %v", tt.pass, err, tt.wantErr)
			}
		})
	}
}