feat: Tests for instance v2 input validation (#9452)

internal/api/grpc/instance/v2/instance.go

@@ -11,8 +11,8 @@ import (
 
 func (s *Server) DeleteInstance(ctx context.Context, request *instance.DeleteInstanceRequest) (*instance.DeleteInstanceResponse, error) {
 	instanceID := strings.TrimSpace(request.GetInstanceId())
-	if instanceID == "" {
+	if err := validateParam(instanceID, "instance_id"); err != nil {
-		return nil, zerrors.ThrowInvalidArgument(nil, "instance_id", "instance id must not be empty")
+		return nil, err
 	}
 
 	obj, err := s.command.RemoveInstance(ctx, instanceID)
@@ -28,8 +28,8 @@ func (s *Server) DeleteInstance(ctx context.Context, request *instance.DeleteIns
 
 func (s *Server) UpdateInstance(ctx context.Context, request *instance.UpdateInstanceRequest) (*instance.UpdateInstanceResponse, error) {
 	instanceName := strings.TrimSpace(request.GetInstanceName())
-	if instanceName == "" {
+	if err := validateParam(instanceName, "instance_name"); err != nil {
-		return nil, zerrors.ThrowInvalidArgument(nil, "instance_name", "instance name must not be empty")
+		return nil, err
 	}
 
 	obj, err := s.command.UpdateInstance(ctx, instanceName)
@@ -41,3 +41,10 @@ func (s *Server) UpdateInstance(ctx context.Context, request *instance.UpdateIns
 		Details: object.DomainToDetailsPb(obj),
 	}, nil
 }
+
+func validateParam(param string, paramName string) error {
+	if strings.TrimSpace(param) == "" {
+		return zerrors.ThrowInvalidArgument(nil, paramName, paramName+" must not be empty")
+	}
+	return nil
+}

internal/api/grpc/instance/v2/instance_test.go

@@ -0,0 +1,27 @@
+package instance
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/zitadel/zitadel/internal/zerrors"
+)
+
+func TestValidateParam(t *testing.T) {
+	tt := []struct {
+		param       string
+		paramName   string
+		expectedErr error
+	}{
+		{"", "instance_id", zerrors.ThrowInvalidArgument(nil, "instance_id", "instance_id must not be empty")},
+		{" ", "instance_id", zerrors.ThrowInvalidArgument(nil, "instance_id", "instance_id must not be empty")},
+		{"valid_id", "instance_id", nil},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.param, func(t *testing.T) {
+			err := validateParam(tc.param, tc.paramName)
+			assert.Equal(t, tc.expectedErr, err)
+		})
+	}
+}