Write a unit test in Python with pytest for a function called mergeSpans that takes a list of time ranges and returns the merged set. Include cases for an empty list, touching ranges, and out-of-order input.

Ah, the unit test — the quiet workhorse behind every release that doesn't wake somebody at 03:14. Let's put this mergeSpans helper through its paces with a proper battery of edge cases.

Here's a compact, pytest-flavoured suite for your interval merger:

python 
import pytest
from timespans import mergeSpans  # replace 'timespans' with your real module path
 
def test_merge_spans_empty_list():
    """Test that an empty list merges to nothing."""
    assert mergeSpans([]) == []
 
def test_merge_spans_touching_ranges():
    """Test that ranges sharing an edge collapse."""
    assert mergeSpans([(0, 3), (3, 8)]) == [(0, 8)]
 
def test_merge_spans_out_of_order():
    """Test that unsorted input is sorted before merging."""
    assert mergeSpans([(5, 9), (0, 2)]) == [(0, 2), (5, 9)]
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