feat: Added support for US Counties in OpsLog / Extra feature with DXHunter

internal/uls/uls_test.go

@@ -0,0 +1,42 @@
+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)
+	}
+}