From cd484a3eeee1128c5aef0018fd264d635e51aeb3 Mon Sep 17 00:00:00 2001
From: Robert Zaremba <robert@zaremba.ch>
Date: Wed, 27 Dec 2023 15:04:52 +0100
Subject: [PATCH] add new checkers helper methods

---
 util/checkers/number.go      | 16 ++++++++++++++++
 util/checkers/number_test.go |  9 +++++++++
 2 files changed, 25 insertions(+)

diff --git a/util/checkers/number.go b/util/checkers/number.go
index 0fdbf9e2ca..5b603d6bb6 100644
--- a/util/checkers/number.go
+++ b/util/checkers/number.go
@@ -52,3 +52,19 @@ func DecInZeroOne(a sdk.Dec, name string, oneInclusive bool) error {
 	}
 	return nil
 }
+
+// DecNotNegative checks if a is defined and a >= 0
+func DecNotNegative(a sdk.Dec, paramName string, errs []error) []error {
+	if a.IsNil() || a.IsNegative() {
+		return append(errs, fmt.Errorf("%s can't be negative", paramName))
+	}
+	return errs
+}
+
+// DecPositive checks if a is defined and a > 0
+func DecPositive(a sdk.Dec, paramName string, errs []error) []error {
+	if a.IsNil() || !a.IsPositive() {
+		return append(errs, fmt.Errorf("%s must be positive", paramName))
+	}
+	return errs
+}
diff --git a/util/checkers/number_test.go b/util/checkers/number_test.go
index ace6f061a4..f5e24c70a5 100644
--- a/util/checkers/number_test.go
+++ b/util/checkers/number_test.go
@@ -3,6 +3,7 @@ package checkers
 import (
 	"testing"
 
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/stretchr/testify/assert"
 	"github.com/umee-network/umee/v6/tests/tsdk"
 )
@@ -81,3 +82,11 @@ func TestDecInZeroOne(t *testing.T) {
 	assert.Error(t, DecInZeroOne(tsdk.DecF(213812), "", true))
 	assert.Error(t, DecInZeroOne(tsdk.DecF(-1), "", true))
 }
+
+func TestDecNotNegative(t *testing.T) {
+	assert.NotNil(t, DecNotNegative(tsdk.DecF(-1), "", nil))
+	assert.NotNil(t, DecNotNegative(sdk.Dec{}, "", nil))
+
+	assert.Nil(t, DecNotNegative(sdk.ZeroDec(), "", nil))
+	assert.Nil(t, DecNotNegative(tsdk.DecF(5), "", nil))
+}