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1 change: 1 addition & 0 deletions changelog/7443.improvement.rst
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Detect if running on GitHub Actions and enable colors by default.
7 changes: 3 additions & 4 deletions src/_pytest/_io/terminalwriter.py
Original file line number Diff line number Diff line change
Expand Up @@ -27,11 +27,10 @@ def should_do_markup(file: TextIO) -> bool:
return True
if os.environ.get("PY_COLORS") == "0":
return False
if os.environ.get("GITHUB_ACTIONS") == "true":
return True
return (
hasattr(file, "isatty")
and file.isatty()
and os.environ.get("TERM") != "dumb"
and not (sys.platform.startswith("java") and os._name == "nt")
hasattr(file, "isatty") and file.isatty() and os.environ.get("TERM") != "dumb"
)


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21 changes: 17 additions & 4 deletions testing/io/test_terminalwriter.py
Original file line number Diff line number Diff line change
Expand Up @@ -154,8 +154,7 @@ def test_attr_hasmarkup() -> None:
assert "\x1b[0m" in s


def test_should_do_markup_PY_COLORS_eq_1(monkeypatch: MonkeyPatch) -> None:
monkeypatch.setitem(os.environ, "PY_COLORS", "1")
def assert_color_set():
file = io.StringIO()
tw = terminalwriter.TerminalWriter(file)
assert tw.hasmarkup
Expand All @@ -166,8 +165,7 @@ def test_should_do_markup_PY_COLORS_eq_1(monkeypatch: MonkeyPatch) -> None:
assert "\x1b[0m" in s


def test_should_do_markup_PY_COLORS_eq_0(monkeypatch: MonkeyPatch) -> None:
monkeypatch.setitem(os.environ, "PY_COLORS", "0")
def assert_color_not_set():
f = io.StringIO()
f.isatty = lambda: True # type: ignore
tw = terminalwriter.TerminalWriter(file=f)
Expand All @@ -177,6 +175,21 @@ def test_should_do_markup_PY_COLORS_eq_0(monkeypatch: MonkeyPatch) -> None:
assert s == "hello\n"


def test_should_do_markup_PY_COLORS_eq_1(monkeypatch: MonkeyPatch) -> None:
monkeypatch.setitem(os.environ, "PY_COLORS", "1")
assert_color_set()


def test_should_not_do_markup_PY_COLORS_eq_0(monkeypatch: MonkeyPatch) -> None:
monkeypatch.setitem(os.environ, "PY_COLORS", "0")
assert_color_not_set()


def test_should_do_markup_GITHUB_ACTIONS_eq_true(monkeypatch: MonkeyPatch) -> None:
monkeypatch.setitem(os.environ, "GITHUB_ACTIONS", "true")
assert_color_set()


class TestTerminalWriterLineWidth:
def test_init(self) -> None:
tw = terminalwriter.TerminalWriter()
Expand Down