test(agentcompat): add dashboard runtime harness

Co-authored-by: naiba/CloudCode <hi+cloudcode@nai.ba>

integration/agentcompat/internal/dashboard/restart_runtime_test.go

@@ -0,0 +1,55 @@
+//go:build linux
+
+package dashboard
+
+import (
+	"context"
+	"path/filepath"
+	"strconv"
+	"testing"
+	"time"
+
+	"github.com/nezhahq/nezha/integration/agentcompat/internal/testpaths"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDashboardRestart_PreservesFixtureIdentityAndCleansGenerations(t *testing.T) {
+	// Given
+	sourceDir, err := testpaths.NezhaSource(t.Name())
+	require.NoError(t, err)
+	dashboard, err := Start(t.Context(), StartConfig{SourceDir: sourceDir, EnableTLS: true, ReceiptGate: true})
+	require.NoError(t, err)
+	t.Cleanup(func() {
+		cleanupContext, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+		defer cancel()
+		require.NoError(t, dashboard.Close(cleanupContext))
+	})
+	fixture := dashboard.FixtureIdentity()
+	firstRuntime := dashboard.RuntimeIdentity()
+	require.NotZero(t, fixture.HTTP.Inode)
+	require.NotZero(t, fixture.HTTPS.Inode)
+
+	// When
+	stopContext, cancel := context.WithTimeout(t.Context(), 15*time.Second)
+	defer cancel()
+	_, err = dashboard.StopProcess(stopContext)
+	require.NoError(t, err)
+	firstPID := firstRuntime.PID
+	_, err = dashboard.StartProcess(stopContext)
+	require.NoError(t, err)
+	secondRuntime := dashboard.RuntimeIdentity()
+
+	// Then
+	require.Equal(t, fixture, dashboard.FixtureIdentity())
+	require.NotEqual(t, firstRuntime.PID, secondRuntime.PID)
+	require.Greater(t, secondRuntime.Generation, firstRuntime.Generation)
+	require.Equal(t, fixture.HTTP.Address, dashboard.Endpoint())
+	require.Equal(t, fixture.HTTP, dashboard.FixtureIdentity().HTTP)
+	require.Equal(t, fixture.HTTPS, dashboard.FixtureIdentity().HTTPS)
+	require.FileExists(t, fixture.DatabasePath)
+	require.FileExists(t, fixture.ConfigPath)
+	require.NoError(t, dashboard.Close(stopContext))
+	require.Len(t, dashboard.CleanupReceipt().Processes, 2)
+	require.NoFileExists(t, filepath.Join("/proc", strconv.Itoa(firstPID)))
+	require.NoDirExists(t, fixture.WorkspaceRoot)
+}