add new checkers helper methods

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
+}

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))
+}