fix: check case validation

hrp/internal/convert/from_json.go

@@ -1,8 +1,6 @@
 package convert
 
 import (
-	"reflect"
-
 	"github.com/pkg/errors"
 
 	"github.com/httprunner/httprunner/v4/hrp"
@@ -16,8 +14,9 @@ func LoadJSONCase(path string) (*hrp.TCase, error) {
 	if err != nil {
 		return nil, errors.Wrap(err, "load json file failed")
 	}
-	if reflect.ValueOf(*caseJSON).IsZero() {
+
-		return nil, errors.New("invalid json file")
+	if caseJSON.TestSteps == nil {
+		return nil, errors.New("invalid json case file, missing teststeps")
 	}
 
 	err = caseJSON.MakeCompat()

hrp/internal/convert/from_postman.go

@@ -129,8 +129,8 @@ func loadCasePostman(path string) (*CasePostman, error) {
 	if err != nil {
 		return nil, errors.Wrap(err, "load postman file failed")
 	}
-	if reflect.ValueOf(*casePostman).IsZero() {
+	if casePostman.Items == nil {
-		return nil, errors.New("invalid postman file")
+		return nil, errors.New("invalid postman case file, missing items")
 	}
 
 	return casePostman, nil

hrp/internal/convert/from_swagger.go

@@ -1,8 +1,6 @@
 package convert
 
 import (
-	"reflect"
-
 	"github.com/go-openapi/spec"
 	"github.com/pkg/errors"
 
@@ -17,8 +15,8 @@ func LoadSwaggerCase(path string) (*hrp.TCase, error) {
 	if err != nil {
 		return nil, errors.Wrap(err, "load swagger file failed")
 	}
-	if reflect.ValueOf(*caseSwagger).IsZero() {
+	if caseSwagger.Definitions == nil {
-		return nil, errors.New("invalid swagger file")
+		return nil, errors.New("invalid swagger case file, missing definitions")
 	}
 
 	// TODO: convert swagger to TCase