Add CI pipeline for variant 5

tests/test_math_tools.py

@@ -0,0 +1,21 @@
+import pytest
+
+from ci_lab.math_tools import average, is_even, median
+
+
+def test_average_returns_arithmetic_mean() -> None:
+    assert average([2, 4, 6, 8]) == 5
+
+def test_average_raises_error_for_empty_list() -> None:
+    with pytest.raises(ValueError, match="numbers must not be empty"):
+        average([])
+
+def test_median_for_odd_count() -> None:
+    assert median([5, 1, 9]) == 5
+
+def test_median_for_even_count() -> None:
+    assert median([10, 2, 8, 4]) == 6
+
+def test_is_even() -> None:
+    assert is_even(10) is True
+    assert is_even(7) is False