From b73f2ece73574395efc243475c50cbeda096a5b8 Mon Sep 17 00:00:00 2001
From: Patrick Hoefler <61934744+phofl@users.noreply.github.com>
Date: Mon, 19 Feb 2024 18:33:47 +0100
Subject: [PATCH] Backport PR #57486: CI: Run excel tests on single cpu for
 windows

---
 pandas/tests/io/excel/test_odf.py        | 5 +++++
 pandas/tests/io/excel/test_odswriter.py  | 5 +++++
 pandas/tests/io/excel/test_openpyxl.py   | 5 +++++
 pandas/tests/io/excel/test_readers.py    | 4 ++++
 pandas/tests/io/excel/test_style.py      | 4 ++++
 pandas/tests/io/excel/test_writers.py    | 4 ++++
 pandas/tests/io/excel/test_xlrd.py       | 5 +++++
 pandas/tests/io/excel/test_xlsxwriter.py | 5 +++++
 8 files changed, 37 insertions(+)

diff --git a/pandas/tests/io/excel/test_odf.py b/pandas/tests/io/excel/test_odf.py
index f01827fa4ca2f..b5bb9b27258d8 100644
--- a/pandas/tests/io/excel/test_odf.py
+++ b/pandas/tests/io/excel/test_odf.py
@@ -3,11 +3,16 @@
 import numpy as np
 import pytest
 
+from pandas.compat import is_platform_windows
+
 import pandas as pd
 import pandas._testing as tm
 
 pytest.importorskip("odf")
 
+if is_platform_windows():
+    pytestmark = pytest.mark.single_cpu
+
 
 @pytest.fixture(autouse=True)
 def cd_and_set_engine(monkeypatch, datapath):
diff --git a/pandas/tests/io/excel/test_odswriter.py b/pandas/tests/io/excel/test_odswriter.py
index 271353a173d2a..1c728ad801bc1 100644
--- a/pandas/tests/io/excel/test_odswriter.py
+++ b/pandas/tests/io/excel/test_odswriter.py
@@ -6,6 +6,8 @@
 
 import pytest
 
+from pandas.compat import is_platform_windows
+
 import pandas as pd
 import pandas._testing as tm
 
@@ -13,6 +15,9 @@
 
 odf = pytest.importorskip("odf")
 
+if is_platform_windows():
+    pytestmark = pytest.mark.single_cpu
+
 
 @pytest.fixture
 def ext():
diff --git a/pandas/tests/io/excel/test_openpyxl.py b/pandas/tests/io/excel/test_openpyxl.py
index 2df9ec9e53516..e53b5830ec6a4 100644
--- a/pandas/tests/io/excel/test_openpyxl.py
+++ b/pandas/tests/io/excel/test_openpyxl.py
@@ -5,6 +5,8 @@
 import numpy as np
 import pytest
 
+from pandas.compat import is_platform_windows
+
 import pandas as pd
 from pandas import DataFrame
 import pandas._testing as tm
@@ -17,6 +19,9 @@
 
 openpyxl = pytest.importorskip("openpyxl")
 
+if is_platform_windows():
+    pytestmark = pytest.mark.single_cpu
+
 
 @pytest.fixture
 def ext():
diff --git a/pandas/tests/io/excel/test_readers.py b/pandas/tests/io/excel/test_readers.py
index 15712f36da4ca..8da8535952dcf 100644
--- a/pandas/tests/io/excel/test_readers.py
+++ b/pandas/tests/io/excel/test_readers.py
@@ -18,6 +18,7 @@
 
 from pandas._config import using_pyarrow_string_dtype
 
+from pandas.compat import is_platform_windows
 import pandas.util._test_decorators as td
 
 import pandas as pd
@@ -34,6 +35,9 @@
     StringArray,
 )
 
+if is_platform_windows():
+    pytestmark = pytest.mark.single_cpu
+
 read_ext_params = [".xls", ".xlsx", ".xlsm", ".xlsb", ".ods"]
 engine_params = [
     # Add any engines to test here
diff --git a/pandas/tests/io/excel/test_style.py b/pandas/tests/io/excel/test_style.py
index 3ca8637885639..89615172688d7 100644
--- a/pandas/tests/io/excel/test_style.py
+++ b/pandas/tests/io/excel/test_style.py
@@ -4,6 +4,7 @@
 import numpy as np
 import pytest
 
+from pandas.compat import is_platform_windows
 import pandas.util._test_decorators as td
 
 from pandas import (
@@ -20,6 +21,9 @@
 # could compute styles and render to excel without jinja2, since there is no
 # 'template' file, but this needs the import error to delayed until render time.
 
+if is_platform_windows():
+    pytestmark = pytest.mark.single_cpu
+
 
 def assert_equal_cell_styles(cell1, cell2):
     # TODO: should find a better way to check equality
diff --git a/pandas/tests/io/excel/test_writers.py b/pandas/tests/io/excel/test_writers.py
index 8c003723c1c71..292eab2d88152 100644
--- a/pandas/tests/io/excel/test_writers.py
+++ b/pandas/tests/io/excel/test_writers.py
@@ -11,6 +11,7 @@
 import numpy as np
 import pytest
 
+from pandas.compat import is_platform_windows
 from pandas.compat._constants import PY310
 from pandas.compat._optional import import_optional_dependency
 import pandas.util._test_decorators as td
@@ -34,6 +35,9 @@
 )
 from pandas.io.excel._util import _writers
 
+if is_platform_windows():
+    pytestmark = pytest.mark.single_cpu
+
 
 def get_exp_unit(path: str) -> str:
     return "ns"
diff --git a/pandas/tests/io/excel/test_xlrd.py b/pandas/tests/io/excel/test_xlrd.py
index 6d5008ca9ee68..066393d91eead 100644
--- a/pandas/tests/io/excel/test_xlrd.py
+++ b/pandas/tests/io/excel/test_xlrd.py
@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+from pandas.compat import is_platform_windows
+
 import pandas as pd
 import pandas._testing as tm
 
@@ -11,6 +13,9 @@
 
 xlrd = pytest.importorskip("xlrd")
 
+if is_platform_windows():
+    pytestmark = pytest.mark.single_cpu
+
 
 @pytest.fixture(params=[".xls"])
 def read_ext_xlrd(request):
diff --git a/pandas/tests/io/excel/test_xlsxwriter.py b/pandas/tests/io/excel/test_xlsxwriter.py
index 94f6bdfaf069c..529367761fc02 100644
--- a/pandas/tests/io/excel/test_xlsxwriter.py
+++ b/pandas/tests/io/excel/test_xlsxwriter.py
@@ -2,6 +2,8 @@
 
 import pytest
 
+from pandas.compat import is_platform_windows
+
 from pandas import DataFrame
 import pandas._testing as tm
 
@@ -9,6 +11,9 @@
 
 xlsxwriter = pytest.importorskip("xlsxwriter")
 
+if is_platform_windows():
+    pytestmark = pytest.mark.single_cpu
+
 
 @pytest.fixture
 def ext():