Fixes #4653 - tmp_path provides real path

AUTHORS

@@ -7,6 +7,7 @@ Aaron Coleman
 Abdeali JK
 Abhijeet Kasurde
 Adam Johnson
+Adam Uhlir
 Ahn Ki-Wook
 Alan Velasco
 Alexander Johnson

changelog/4653.bugfix.rst

@@ -0,0 +1 @@
+``tmp_path`` fixture and other related ones provides resolved path (a.k.a real path)

src/_pytest/tmpdir.py

@@ -65,7 +65,7 @@ def getbasetemp(self):
                 ensure_reset_dir(basetemp)
             else:
                 from_env = os.environ.get("PYTEST_DEBUG_TEMPROOT")
-                temproot = Path(from_env or tempfile.gettempdir())
+                temproot = Path(from_env or tempfile.gettempdir()).resolve()
                 user = get_user() or "unknown"
                 # use a sub-directory in the temproot to speed-up
                 # make_numbered_dir() call

testing/test_tmpdir.py

@@ -121,6 +121,22 @@ def test_1(tmpdir):
     assert not result.ret
 
 
+def test_tmp_path_always_is_realpath(testdir, monkeypatch):
+    # for reasoning see: test_tmpdir_always_is_realpath test-case
+    realtemp = testdir.tmpdir.mkdir("myrealtemp")
+    linktemp = testdir.tmpdir.join("symlinktemp")
+    attempt_symlink_to(linktemp, str(realtemp))
+    monkeypatch.setenv("PYTEST_DEBUG_TEMPROOT", str(linktemp))
+    testdir.makepyfile(
+        """
+        def test_1(tmp_path):
+            assert tmp_path.resolve() == tmp_path
+    """
+    )
+    reprec = testdir.inline_run()
+    reprec.assertoutcome(passed=1)
+
+
 def test_tmpdir_too_long_on_parametrization(testdir):
     testdir.makepyfile(
         """