Revert "Add xfail marks for IndexFile.from_tree failures"

This removes the xfail marks from 8 tests that fail due to gitpython-developers#1630,
to be fixed in the subsequent commits.

This reverts commit 6e477e3.

Author: EliahKagan

Diff for: test/test_docs.py

@@ -8,10 +8,11 @@
 
 import pytest
 
-from git.exc import GitCommandError
 from test.lib import TestBase
 from test.lib.helper import with_rw_directory
 
+import os.path
+
 
 class Tutorials(TestBase):
     def tearDown(self):
@@ -206,14 +207,6 @@ def update(self, op_code, cur_count, max_count=None, message=""):
         assert sm.module_exists()  # The submodule's working tree was checked out by update.
         # ![14-test_init_repo_object]
 
-    @pytest.mark.xfail(
-        os.name == "nt",
-        reason=(
-            "IndexFile.from_tree is broken on Windows (related to NamedTemporaryFile), see #1630.\n"
-            "'git read-tree --index-output=...' fails with 'fatal: unable to write new index file'."
-        ),
-        raises=GitCommandError,
-    )
     @with_rw_directory
     def test_references_and_objects(self, rw_dir):
         # [1-test_references_and_objects]

Diff for: test/test_fun.py

@@ -3,13 +3,10 @@
 
 from io import BytesIO
 from stat import S_IFDIR, S_IFREG, S_IFLNK, S_IXUSR
-import os
+from os import stat
 import os.path as osp
 
-import pytest
-
 from git import Git
-from git.exc import GitCommandError
 from git.index import IndexFile
 from git.index.fun import (
     aggressive_tree_merge,
@@ -37,14 +34,6 @@ def _assert_index_entries(self, entries, trees):
             assert (entry.path, entry.stage) in index.entries
         # END assert entry matches fully
 
-    @pytest.mark.xfail(
-        os.name == "nt",
-        reason=(
-            "IndexFile.from_tree is broken on Windows (related to NamedTemporaryFile), see #1630.\n"
-            "'git read-tree --index-output=...' fails with 'fatal: unable to write new index file'."
-        ),
-        raises=GitCommandError,
-    )
     def test_aggressive_tree_merge(self):
         # Head tree with additions, removals and modification compared to its predecessor.
         odb = self.rorepo.odb
@@ -302,12 +291,12 @@ def test_linked_worktree_traversal(self, rw_dir):
         rw_master.git.worktree("add", worktree_path, branch.name)
 
         dotgit = osp.join(worktree_path, ".git")
-        statbuf = os.stat(dotgit)
+        statbuf = stat(dotgit)
         self.assertTrue(statbuf.st_mode & S_IFREG)
 
         gitdir = find_worktree_git_dir(dotgit)
         self.assertIsNotNone(gitdir)
-        statbuf = os.stat(gitdir)
+        statbuf = stat(gitdir)
         self.assertTrue(statbuf.st_mode & S_IFDIR)
 
     def test_tree_entries_from_data_with_failing_name_decode_py3(self):

Diff for: test/test_index.py

@@ -284,14 +284,6 @@ def add_bad_blob():
         except Exception as ex:
             assert "index.lock' could not be obtained" not in str(ex)
 
-    @pytest.mark.xfail(
-        os.name == "nt",
-        reason=(
-            "IndexFile.from_tree is broken on Windows (related to NamedTemporaryFile), see #1630.\n"
-            "'git read-tree --index-output=...' fails with 'fatal: unable to write new index file'."
-        ),
-        raises=GitCommandError,
-    )
     @with_rw_repo("0.1.6")
     def test_index_file_from_tree(self, rw_repo):
         common_ancestor_sha = "5117c9c8a4d3af19a9958677e45cda9269de1541"
@@ -342,14 +334,6 @@ def test_index_file_from_tree(self, rw_repo):
         # END for each blob
         self.assertEqual(num_blobs, len(three_way_index.entries))
 
-    @pytest.mark.xfail(
-        os.name == "nt",
-        reason=(
-            "IndexFile.from_tree is broken on Windows (related to NamedTemporaryFile), see #1630.\n"
-            "'git read-tree --index-output=...' fails with 'fatal: unable to write new index file'."
-        ),
-        raises=GitCommandError,
-    )
     @with_rw_repo("0.1.6")
     def test_index_merge_tree(self, rw_repo):
         # A bit out of place, but we need a different repo for this:
@@ -412,14 +396,6 @@ def test_index_merge_tree(self, rw_repo):
         self.assertEqual(len(unmerged_blobs), 1)
         self.assertEqual(list(unmerged_blobs.keys())[0], manifest_key[0])
 
-    @pytest.mark.xfail(
-        os.name == "nt",
-        reason=(
-            "IndexFile.from_tree is broken on Windows (related to NamedTemporaryFile), see #1630.\n"
-            "'git read-tree --index-output=...' fails with 'fatal: unable to write new index file'."
-        ),
-        raises=GitCommandError,
-    )
     @with_rw_repo("0.1.6")
     def test_index_file_diffing(self, rw_repo):
         # Default Index instance points to our index.
@@ -554,14 +530,6 @@ def _count_existing(self, repo, files):
 
     # END num existing helper
 
-    @pytest.mark.xfail(
-        os.name == "nt",
-        reason=(
-            "IndexFile.from_tree is broken on Windows (related to NamedTemporaryFile), see #1630.\n"
-            "'git read-tree --index-output=...' fails with 'fatal: unable to write new index file'."
-        ),
-        raises=GitCommandError,
-    )
     @with_rw_repo("0.1.6")
     def test_index_mutation(self, rw_repo):
         index = rw_repo.index
@@ -915,14 +883,6 @@ def make_paths():
         for absfile in absfiles:
             assert osp.isfile(absfile)
 
-    @pytest.mark.xfail(
-        os.name == "nt",
-        reason=(
-            "IndexFile.from_tree is broken on Windows (related to NamedTemporaryFile), see #1630.\n"
-            "'git read-tree --index-output=...' fails with 'fatal: unable to write new index file'."
-        ),
-        raises=GitCommandError,
-    )
     @with_rw_repo("HEAD")
     def test_compare_write_tree(self, rw_repo):
         """Test writing all trees, comparing them for equality."""

Diff for: test/test_refs.py

@@ -4,11 +4,8 @@
 # 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/
 
 from itertools import chain
-import os
 from pathlib import Path
 
-import pytest
-
 from git import (
     Reference,
     Head,
@@ -218,14 +215,6 @@ def test_head_checkout_detached_head(self, rw_repo):
         assert isinstance(res, SymbolicReference)
         assert res.name == "HEAD"
 
-    @pytest.mark.xfail(
-        os.name == "nt",
-        reason=(
-            "IndexFile.from_tree is broken on Windows (related to NamedTemporaryFile), see #1630.\n"
-            "'git read-tree --index-output=...' fails with 'fatal: unable to write new index file'."
-        ),
-        raises=GitCommandError,
-    )
     @with_rw_repo("0.1.6")
     def test_head_reset(self, rw_repo):
         cur_head = rw_repo.head