package uls
import (
"os"
"testing"
)
func TestGrid6(t *testing.T) {
cases := []struct {
lat, lon float64
want string
}{
{38.90, -77.03, "FM18lw"}, // Washington DC
{40.71, -74.00, "FN30xr"}, // New York
{34.05, -118.24, "DM04vd"}, // Los Angeles
}
for _, c := range cases {
if got := grid6(c.lat, c.lon); got[:4] != c.want[:4] {
t.Errorf("grid6(%v,%v)=%q want field/square %q", c.lat, c.lon, got, c.want[:4])
}
}
}
// TestParseGeoNames runs against the real GeoNames US.zip if present in the
// scratchpad (downloaded during development); skipped otherwise.
func TestParseGeoNames(t *testing.T) {
path := os.Getenv("GEONAMES_ZIP")
if path == "" {
t.Skip("set GEONAMES_ZIP to the US.zip path to run")
}
m, err := parseGeoNames(path)
if err != nil {
t.Fatal(err)
}
if len(m) < 30000 {
t.Fatalf("expected >30k ZIPs, got %d", len(m))
}
// A known ZIP: 20500 = The White House, DC.
if r, ok := m["20500"]; !ok || r.state != "DC" {
t.Errorf("ZIP 20500 = %+v (ok=%v)", r, ok)
}
}
// The real listing captured from data.fcc.gov on 2026-07-25, the day after the
// FCC renamed complete/ to complete.07242026/ and left an empty complete/
// behind — which broke the county-database download for every user.
const fccListing2026 = `Index of /download/pub/uls
Index of /download/pub/uls
`
func TestParseCompleteDirs(t *testing.T) {
got := parseCompleteDirs(fccListing2026)
if len(got) != 1 || got[0] != "complete.07242026/" {
t.Fatalf("got %v, want [complete.07242026/]", got)
}
// "complete/" is deliberately absent: it is the canonical URL, already tried
// before the listing is consulted, and on this date it was empty.
for _, d := range got {
if d == "complete/" {
t.Error("canonical complete/ should not be offered as a fallback")
}
}
}
// Several snapshots must be tried newest-first, so a stale one is never
// preferred over a fresh one.
func TestParseCompleteDirsPrefersNewestSnapshot(t *testing.T) {
html := `xx` +
`xx`
got := parseCompleteDirs(html)
want := []string{"complete.07242026/", "complete.01052026/", "complete.11302025/"}
if len(got) != len(want) {
t.Fatalf("got %v, want %v", got, want)
}
for i := range want {
if got[i] != want[i] {
t.Fatalf("got %v, want %v", got, want)
}
}
}
func TestSnapshotDate(t *testing.T) {
if d := snapshotDate("complete.07242026/"); d.Format("2006-01-02") != "2026-07-24" {
t.Errorf("complete.07242026/ → %s, want 2026-07-24", d.Format("2006-01-02"))
}
// An undated name must sort last rather than crash.
if !snapshotDate("complete.backup/").IsZero() {
t.Error("an undated directory should yield the zero time")
}
}