import unittest
from lib.util import format_satoshis

class TestUtil(unittest.TestCase):

    def test_format_satoshis(self):
        result = format_satoshis(1234)
        expected = "0.00001234"
        self.assertEqual(expected, result)

    def test_format_satoshis_diff_positive(self):
        result = format_satoshis(1234, is_diff=True)
        expected = "+0.00001234"
        self.assertEqual(expected, result)

    def test_format_satoshis_diff_negative(self):
        result = format_satoshis(-1234, is_diff=True)
        expected = "-0.00001234"
        self.assertEqual(expected, result)