integration: expose backend logs in sandbox interface

Signed-off-by: CrazyMax <[email protected]>

Author: crazy-max

util/testutil/integration/run.go

@@ -45,6 +45,7 @@ type Sandbox interface {
 
 	Context() context.Context
 	Cmd(...string) *exec.Cmd
+	Logs() map[string]*bytes.Buffer
 	PrintLogs(*testing.T)
 	ClearLogs()
 	NewRegistry() (string, error)

util/testutil/integration/sandbox.go

@@ -72,6 +72,10 @@ func (sb *sandbox) Context() context.Context {
 	return sb.ctx
 }
 
+func (sb *sandbox) Logs() map[string]*bytes.Buffer {
+	return sb.logs
+}
+
 func (sb *sandbox) PrintLogs(t *testing.T) {
 	printLogs(sb.logs, t.Log)
 }