skyview/internal/merger/merger_test.go

package merger

import (
	"encoding/json"
	"testing"
	"time"

	"skyview/internal/modes"
)

func TestAircraftState_MarshalJSON_AgeCalculation(t *testing.T) {
	// Create a test aircraft state with a known LastUpdate time
	pastTime := time.Now().Add(-30 * time.Second) // 30 seconds ago

	state := &AircraftState{
		Aircraft: &modes.Aircraft{
			ICAO24:   0x123456,
			Callsign: "TEST123",
		},
		LastUpdate: pastTime,
	}

	// Marshal to JSON
	jsonData, err := json.Marshal(state)
	if err != nil {
		t.Fatalf("Failed to marshal AircraftState: %v", err)
	}

	// Parse the JSON to check the age field
	var result map[string]interface{}
	if err := json.Unmarshal(jsonData, &result); err != nil {
		t.Fatalf("Failed to unmarshal JSON: %v", err)
	}

	// Check that age is not 0 and is approximately 30 seconds
	age, ok := result["age"].(float64)
	if !ok {
		t.Fatal("Age field not found or not a number")
	}

	if age < 25 || age > 35 {
		t.Errorf("Expected age to be around 30 seconds, got %f", age)
	}

	if age == 0 {
		t.Error("Age should not be 0 - this indicates the bug is still present")
	}

	t.Logf("Aircraft age calculated correctly: %f seconds", age)
}

func TestAircraftState_MarshalJSON_ZeroAge(t *testing.T) {
	// Test with very recent time to ensure age is very small but not exactly 0
	recentTime := time.Now()

	state := &AircraftState{
		Aircraft: &modes.Aircraft{
			ICAO24:   0x123456,
			Callsign: "TEST123",
		},
		LastUpdate: recentTime,
	}

	// Marshal to JSON
	jsonData, err := json.Marshal(state)
	if err != nil {
		t.Fatalf("Failed to marshal AircraftState: %v", err)
	}

	// Parse the JSON to check the age field
	var result map[string]interface{}
	if err := json.Unmarshal(jsonData, &result); err != nil {
		t.Fatalf("Failed to unmarshal JSON: %v", err)
	}

	// Check that age is very small but should not be exactly 0 (unless extremely fast)
	age, ok := result["age"].(float64)
	if !ok {
		t.Fatal("Age field not found or not a number")
	}

	if age < 0 {
		t.Errorf("Age should not be negative, got %f", age)
	}

	// Age should be very small (less than 1 second) but might not be exactly 0
	if age > 1.0 {
		t.Errorf("Age should be very small for recent update, got %f", age)
	}

	t.Logf("Recent aircraft age calculated correctly: %f seconds", age)
}