itests/kit: add guard to ensure imports from tests only.

itests/kit/init.go

@@ -3,6 +3,7 @@ package kit
 import (
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/lotus/build"
@@ -11,6 +12,11 @@ import (
 )
 
 func init() {
+	bin := os.Args[0]
+	if !strings.HasSuffix(bin, ".test") {
+		panic("package itests/kit must only be imported from tests")
+	}
+
 	_ = logging.SetLogLevel("*", "INFO")
 
 	policy.SetConsensusMinerMinPower(abi.NewStoragePower(2048))
@@ -22,4 +28,5 @@ func init() {
 		panic(fmt.Sprintf("failed to set BELLMAN_NO_GPU env variable: %s", err))
 	}
 	build.InsecurePoStValidation = true
+
 }