diff --git a/Lib/test/test_statistics.py b/Lib/test/test_statistics.py
index 0e46a7119f0efc..5c3b1fdd8b110d 100644
--- a/Lib/test/test_statistics.py
+++ b/Lib/test/test_statistics.py
@@ -1004,6 +1004,10 @@ def test_nan(self):
x = statistics._convert(nan, type(nan))
self.assertTrue(_nan_equal(x, nan))
+ def test_invalid_input_type(self):
+ with self.assertRaises(TypeError):
+ statistics._convert(None, float)
+
class FailNegTest(unittest.TestCase):
"""Test _fail_neg private function."""
@@ -1033,6 +1037,50 @@ def test_error_msg(self):
self.assertEqual(errmsg, msg)
+class FindLteqTest(unittest.TestCase):
+ # Test _find_lteq private function.
+
+ def test_invalid_input_values(self):
+ for a, x in [
+ ([], 1),
+ ([1, 2], 3),
+ ([1, 3], 2)
+ ]:
+ with self.subTest(a=a, x=x):
+ with self.assertRaises(ValueError):
+ statistics._find_lteq(a, x)
+
+ def test_locate_successfully(self):
+ for a, x, expected_i in [
+ ([1, 1, 1, 2, 3], 1, 0),
+ ([0, 1, 1, 1, 2, 3], 1, 1),
+ ([1, 2, 3, 3, 3], 3, 2)
+ ]:
+ with self.subTest(a=a, x=x):
+ self.assertEqual(expected_i, statistics._find_lteq(a, x))
+
+
+class FindRteqTest(unittest.TestCase):
+ # Test _find_rteq private function.
+
+ def test_invalid_input_values(self):
+ for a, l, x in [
+ ([1], 2, 1),
+ ([1, 3], 0, 2)
+ ]:
+ with self.assertRaises(ValueError):
+ statistics._find_rteq(a, l, x)
+
+ def test_locate_successfully(self):
+ for a, l, x, expected_i in [
+ ([1, 1, 1, 2, 3], 0, 1, 2),
+ ([0, 1, 1, 1, 2, 3], 0, 1, 3),
+ ([1, 2, 3, 3, 3], 0, 3, 4)
+ ]:
+ with self.subTest(a=a, l=l, x=x):
+ self.assertEqual(expected_i, statistics._find_rteq(a, l, x))
+
+
# === Tests for public functions ===
class UnivariateCommonMixin:
@@ -1476,6 +1524,18 @@ def test_negative_error(self):
with self.subTest(values=values):
self.assertRaises(exc, self.func, values)
+ def test_invalid_type_error(self):
+ # Test error is raised when input contains invalid type(s)
+ for data in [
+ ['3.14'], # single string
+ ['1', '2', '3'], # multiple strings
+ [1, '2', 3, '4', 5], # mixed strings and valid integers
+ [2.3, 3.4, 4.5, '5.6'] # only one string and valid floats
+ ]:
+ with self.subTest(data=data):
+ with self.assertRaises(TypeError):
+ self.func(data)
+
def test_ints(self):
# Test harmonic mean with ints.
data = [2, 4, 4, 8, 16, 16]
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