feat: Add a percentage function to the calculator #18

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typosaurus merged 2 commits from typosaurus/16-add-a-percentage-function-to-the-calculator into main 2026-07-26 21:51:01 +02:00
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1 changed files with 27 additions and 1 deletions
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28
tests/test_calculator.py
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@ -3,7 +3,7 @@
import math
import unittest
from src.calculator import clamp, variance
from src.calculator import clamp, percentage, variance
class TestClampFunction(unittest.TestCase):
@ -63,6 +63,31 @@ class TestClampFunction(unittest.TestCase):
self.assertTrue(math.isnan(result))
class TestPercentageFunction(unittest.TestCase):
def test_valid_percentage(self) -> None:
self.assertEqual(percentage(50, 200), 25.0)
def test_zero_value(self) -> None:
self.assertEqual(percentage(0, 100), 0.0)
def test_full_value(self) -> None:
self.assertEqual(percentage(200, 100), 200.0)
def test_fractional(self) -> None:
self.assertAlmostEqual(percentage(1, 3), 33.333333333333336)
def test_total_zero(self) -> None:
with self.assertRaises(ValueError):
percentage(50, 0)
def test_float_arguments(self) -> None:
self.assertEqual(percentage(25.5, 100.0), 25.5)
def test_negative_value(self) -> None:
self.assertEqual(percentage(-50, 200), -25.0)
class TestVarianceFunction(unittest.TestCase):
def test_empty_list_raises_value_error(self) -> None:
@ -94,3 +119,4 @@ class TestVarianceFunction(unittest.TestCase):
self.assertEqual(variance((1, 2, 3, 4, 5)), 2.0)