From c2980eb80ffc9a7ab81d1424afeac77ec46a2fe2 Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Sun, 26 Jan 2020 23:36:28 +0100
Subject: [PATCH] pytester: test for _makefile joining an absolute path

Ref: https://github.com/pytest-dev/pytest/pull/6578#discussion_r371035867
---
 testing/test_pytester.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/testing/test_pytester.py b/testing/test_pytester.py
index 869e35db3..35a06e33a 100644
--- a/testing/test_pytester.py
+++ b/testing/test_pytester.py
@@ -710,3 +710,13 @@ def test_testdir_outcomes_with_multiple_errors(testdir):
     result.assert_outcomes(error=2)
 
     assert result.parseoutcomes() == {"error": 2}
+
+
+def test_makefile_joins_absolute_path(testdir: Testdir) -> None:
+    absfile = testdir.tmpdir / "absfile"
+    if sys.platform == "win32":
+        with pytest.raises(OSError):
+            testdir.makepyfile(**{str(absfile): ""})
+    else:
+        p1 = testdir.makepyfile(**{str(absfile): ""})
+        assert str(p1) == (testdir.tmpdir / absfile) + ".py"