math_test.go

package main

import (
	"testing"

	"github.com/stretchr/testify/require"
)

func TestMath(t *testing.T) {
	zero := Dec{}
	one := NewDecFromInt64(1)
	two := NewDecFromInt64(2)
	three := NewDecFromInt64(3)
	four := NewDecFromInt64(4)
	five := NewDecFromInt64(5)
	minusOne := NewDecFromInt64(-1)

	res, err := two.Add(zero)
	require.NoError(t, err)
	require.True(t, res.IsEqual(two))

	res, err = five.Sub(two)
	require.NoError(t, err)
	require.True(t, res.IsEqual(three))

	res, err = four.Quo(two)
	require.NoError(t, err)
	require.True(t, res.IsEqual(two))

	res, err = five.QuoInteger(two)
	require.NoError(t, err)
	require.True(t, res.IsEqual(two))

	res, err = five.Rem(two)
	require.NoError(t, err)
	require.True(t, res.IsEqual(one))

	x, err := four.Int64()
	require.NoError(t, err)
	require.Equal(t, int64(4), x)

	require.Equal(t, "5", five.String())

	require.True(t, zero.IsZero())
	require.False(t, zero.IsPositive())
	require.False(t, zero.IsNegative())

	require.False(t, one.IsZero())
	require.True(t, one.IsPositive())
	require.False(t, one.IsNegative())

	require.False(t, minusOne.IsZero())
	require.False(t, minusOne.IsPositive())
	require.True(t, minusOne.IsNegative())
}