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# retoor <retoor@molodetz.nl>
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import math
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import unittest
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from src.calculator import clamp, percentage, variance
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class TestClampFunction(unittest.TestCase):
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def test_value_below_low_returns_low(self) -> None:
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self.assertEqual(clamp(-5, 0, 10), 0)
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def test_value_above_high_returns_high(self) -> None:
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self.assertEqual(clamp(15, 0, 10), 10)
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def test_value_in_range_returns_value(self) -> None:
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self.assertEqual(clamp(5, 0, 10), 5)
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def test_value_equals_low_returns_low(self) -> None:
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self.assertEqual(clamp(0, 0, 10), 0)
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def test_value_equals_high_returns_high(self) -> None:
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self.assertEqual(clamp(10, 0, 10), 10)
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def test_low_greater_than_high_raises_value_error(self) -> None:
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with self.assertRaises(ValueError):
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clamp(5, 10, 0)
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def test_all_negative_values(self) -> None:
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self.assertEqual(clamp(-10, -5, -1), -5)
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def test_float_value_below_low_returns_low_as_int(self) -> None:
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self.assertEqual(clamp(-1.0, 0, 10), 0)
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def test_float_value_above_high_returns_high_as_int(self) -> None:
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self.assertEqual(clamp(15.0, 0, 10), 10)
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def test_float_value_in_range_returns_float(self) -> None:
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result = clamp(5.0, 0, 10)
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self.assertIsInstance(result, float)
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self.assertEqual(result, 5.0)
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def test_float_value_equals_boundary_returns_boundary(self) -> None:
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self.assertEqual(clamp(0.0, 0, 10), 0)
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self.assertEqual(clamp(10.0, 0, 10), 10)
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def test_float_low_greater_than_float_high_raises_value_error(self) -> None:
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with self.assertRaises(ValueError):
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clamp(5.0, 10.0, 0.0)
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def test_large_values(self) -> None:
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self.assertEqual(clamp(10**9, 0, 10**6), 10**6)
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def test_negative_infinity_not_clamped_by_default(self) -> None:
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self.assertEqual(clamp(-math.inf, 0, 10), 0)
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def test_positive_infinity_not_clamped_by_default(self) -> None:
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self.assertEqual(clamp(math.inf, 0, 10), 10)
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def test_nan_returns_nan(self) -> None:
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result = clamp(math.nan, 0, 10)
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self.assertTrue(math.isnan(result))
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class TestPercentageFunction(unittest.TestCase):
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def test_valid_percentage(self) -> None:
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self.assertEqual(percentage(50, 200), 25.0)
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def test_zero_value(self) -> None:
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self.assertEqual(percentage(0, 100), 0.0)
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def test_full_value(self) -> None:
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self.assertEqual(percentage(200, 100), 200.0)
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def test_fractional(self) -> None:
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self.assertAlmostEqual(percentage(1, 3), 33.333333333333336)
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def test_total_zero(self) -> None:
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with self.assertRaises(ValueError):
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percentage(50, 0)
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def test_float_arguments(self) -> None:
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self.assertEqual(percentage(25.5, 100.0), 25.5)
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def test_negative_value(self) -> None:
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self.assertEqual(percentage(-50, 200), -25.0)
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class TestVarianceFunction(unittest.TestCase):
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def test_empty_list_raises_value_error(self) -> None:
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with self.assertRaises(ValueError):
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variance([])
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def test_empty_tuple_raises_value_error(self) -> None:
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with self.assertRaises(ValueError):
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variance(())
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def test_single_element_returns_zero(self) -> None:
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self.assertEqual(variance([42.0]), 0.0)
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def test_constant_values_return_zero_variance(self) -> None:
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self.assertEqual(variance([1.0, 1.0, 1.0]), 0.0)
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def test_population_variance_of_known_set(self) -> None:
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self.assertEqual(variance([1, 2, 3, 4, 5]), 2.0)
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def test_two_element_variance(self) -> None:
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self.assertEqual(variance([0, 2]), 1.0)
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def test_integer_inputs_return_float(self) -> None:
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result = variance([10, 20, 30])
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self.assertIsInstance(result, float)
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self.assertEqual(result, 200.0 / 3.0)
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def test_tuple_input_returns_variance(self) -> None:
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self.assertEqual(variance((1, 2, 3, 4, 5)), 2.0)
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