added test

Author: asmyasnikov

table/types/cast_test.go

@@ -0,0 +1,54 @@
+package types
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestToDecimal(t *testing.T) {
+	for _, tt := range []struct {
+		v   Value
+		d   *Decimal
+		err bool
+	}{
+		{
+			v: DecimalValue(&Decimal{
+				Bytes:     [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5},
+				Precision: 22,
+				Scale:     9,
+			}),
+			d: &Decimal{
+				Bytes:     [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5},
+				Precision: 22,
+				Scale:     9,
+			},
+			err: false,
+		},
+		{
+			v: DecimalValueFromBigInt(big.NewInt(123456789), 22, 9),
+			d: &Decimal{
+				Bytes:     [16]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 91, 205, 21},
+				Precision: 22,
+				Scale:     9,
+			},
+			err: false,
+		},
+		{
+			v:   Uint64Value(0),
+			d:   nil,
+			err: true,
+		},
+	} {
+		t.Run("", func(t *testing.T) {
+			d, err := ToDecimal(tt.v)
+			if tt.err {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tt.d, d)
+			}
+		})
+	}
+}