def test_list():
    assert [1, 2, 3] == [1, 4, 3]
def test_str():
    assert "asdf" == "asgf"

> uv init
> uv add pytest pygments
...
> uv run pytest -vv
FAILED test_test.py::test_list - assert [1, 2, 3] == [1, 4, 3]

  At index 1 diff: 2 != 4

  Full diff:
    [
        1,
  -     4,
  ?     ^
  +     2,
  ?     ^
        3,
    ]
FAILED test_test.py::test_str - AssertionError: assert 'asdf' == 'asgf'

  - asgf
  ?   ^
  + asdf
  ?   ^

here we can observe that no coloring has been applied to the string diff

• a detailed description of the bug or problem you are having
• output of pip list from the virtual environment you are using

  > uv tree
  uv tree
  Resolved 7 packages in 4ms
  test v1
  ├── pygments v2.19.1
  └── pytest v8.3.4
      ├── colorama v0.4.6
      ├── iniconfig v2.0.0
      ├── packaging v24.2
      └── pluggy v1.5.0
  

• pytest and operating system versions
  windows 10
• minimal example if possible