feat: add kpp signature

Author: sshaplygin

validator.go

@@ -78,3 +78,7 @@ func ValidateOGRNIP(ogrnip string) (bool, error) {
 func ValidateSNILS(snils string) (bool, error) {
 	return false, nil
 }
+
+func ValidateKPP(kpp string) (bool, error) {
+	return false, nil
+}

validator_test.go

@@ -28,12 +28,12 @@ func TestValidateINN(t *testing.T) {
 		testCases := []TestINNCase{
 			TestINNCase{
 				INN:     "12345678",
-				Error:   errInvalidLength,
+				Error:   errInvalidINNLength,
 				IsValid: false,
 			},
 			TestINNCase{
 				INN:     "9876543211123",
-				Error:   errInvalidLength,
+				Error:   errInvalidINNLength,
 				IsValid: false,
 			},
 			TestINNCase{
@@ -113,3 +113,11 @@ func TestValidateSNILS(t *testing.T) {
 
 	})
 }
+
+func TestValidateKPP(t *testing.T) {
+	t.Parallel()
+
+	t.Run("", func(t *testing.T) {
+
+	})
+}