feat: monitor connected Wi-Fi signal per interface (#2367)

internal/entities/system/wifi_test.go

@@ -0,0 +1,37 @@
+package system
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/fxamacker/cbor/v2"
+)
+
+func TestWiFiWireSnapshot(t *testing.T) {
+	signal := -55.0
+	for _, wifi := range []map[string]WiFi{nil, {}, {"wlan0": {SSID: "home", Signal: &signal}, "wlan1": {}}} {
+		original := CombinedData{Info: Info{WiFi: wifi}, Stats: Stats{WiFi: wifi}}
+		encoded, err := cbor.Marshal(original)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var decoded CombinedData
+		if err = cbor.Unmarshal(encoded, &decoded); err != nil {
+			t.Fatal(err)
+		}
+		if len(decoded.Info.WiFi) != len(wifi) || len(decoded.Stats.WiFi) != len(wifi) {
+			t.Fatal(decoded)
+		}
+		encoded, err = json.Marshal(decoded.Info)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var info map[string]any
+		if err = json.Unmarshal(encoded, &info); err != nil {
+			t.Fatal(err)
+		}
+		if _, ok := info["wifi"]; !ok {
+			t.Fatal("current absence must be explicit")
+		}
+	}
+}