TST: Mark numba & threading tests as single cpu

pandas/tests/groupby/aggregate/test_numba.py

@@ -13,6 +13,8 @@
 )
 import pandas._testing as tm
 
+pytestmark = pytest.mark.single_cpu
+
 
 @td.skip_if_no("numba")
 def test_correct_function_signature():

pandas/tests/groupby/test_numba.py

@@ -8,6 +8,8 @@
 )
 import pandas._testing as tm
 
+pytestmark = pytest.mark.single_cpu
+
 
 @td.skip_if_no("numba")
 @pytest.mark.filterwarnings("ignore")

pandas/tests/groupby/transform/test_numba.py

@@ -11,6 +11,8 @@
 )
 import pandas._testing as tm
 
+pytestmark = pytest.mark.single_cpu
+
 
 @td.skip_if_no("numba")
 def test_correct_function_signature():

pandas/tests/io/parser/test_multi_thread.py

@@ -15,7 +15,11 @@
 
 # We'll probably always skip these for pyarrow
 # Maybe we'll add our own tests for pyarrow too
-pytestmark = pytest.mark.usefixtures("pyarrow_skip")
+pytestmark = [
+    pytest.mark.single_cpu,
+    pytest.mark.slow,
+    pytest.mark.usefixtures("pyarrow_skip"),
+]
 
 
 def _construct_dataframe(num_rows):
@@ -40,7 +44,6 @@ def _construct_dataframe(num_rows):
     return df
 
 
-@pytest.mark.slow
 def test_multi_thread_string_io_read_csv(all_parsers):
     # see gh-11786
     parser = all_parsers
@@ -135,7 +138,6 @@ def reader(arg):
     return final_dataframe
 
 
-@pytest.mark.slow
 def test_multi_thread_path_multipart_read_csv(all_parsers):
     # see gh-11786
     num_tasks = 4

pandas/tests/io/pytables/test_categorical.py

@@ -14,9 +14,7 @@
     ensure_clean_store,
 )
 
-pytestmark = [
-    pytest.mark.single_cpu,
-]
+pytestmark = pytest.mark.single_cpu
 
 
 def test_categorical(setup_path):

pandas/tests/io/test_html.py

@@ -1347,6 +1347,7 @@ def __iter__(self) -> Iterator:
         assert self.read_html(bad)
 
     @pytest.mark.slow
+    @pytest.mark.single_cpu
     def test_importcheck_thread_safety(self, datapath):
         # see gh-16928
 

pandas/tests/io/test_user_agent.py

@@ -17,10 +17,13 @@
 import pandas as pd
 import pandas._testing as tm
 
-pytestmark = pytest.mark.skipif(
-    is_ci_environment(),
-    reason="GH 45651: This test can hang in our CI min_versions build",
-)
+pytestmark = [
+    pytest.mark.single_cpu,
+    pytest.mark.skipif(
+        is_ci_environment(),
+        reason="GH 45651: This test can hang in our CI min_versions build",
+    ),
+]
 
 
 class BaseUserAgentResponder(http.server.BaseHTTPRequestHandler):

pandas/tests/window/test_numba.py

@@ -17,13 +17,15 @@
 )
 import pandas._testing as tm
 
-# TODO(GH#44584): Mark these as pytest.mark.single_cpu
-pytestmark = pytest.mark.skipif(
-    is_ci_environment() and (is_platform_windows() or is_platform_mac()),
-    reason="On GHA CI, Windows can fail with "
-    "'Windows fatal exception: stack overflow' "
-    "and macOS can timeout",
-)
+pytestmark = [
+    pytest.mark.single_cpu,
+    pytest.mark.skipif(
+        is_ci_environment() and (is_platform_windows() or is_platform_mac()),
+        reason="On GHA CI, Windows can fail with "
+        "'Windows fatal exception: stack overflow' "
+        "and macOS can timeout",
+    ),
+]
 
 
 @pytest.fixture(params=["single", "table"])

pandas/tests/window/test_online.py

@@ -14,13 +14,15 @@
 )
 import pandas._testing as tm
 
-# TODO(GH#44584): Mark these as pytest.mark.single_cpu
-pytestmark = pytest.mark.skipif(
-    is_ci_environment() and (is_platform_windows() or is_platform_mac()),
-    reason="On GHA CI, Windows can fail with "
-    "'Windows fatal exception: stack overflow' "
-    "and macOS can timeout",
-)
+pytestmark = [
+    pytest.mark.single_cpu,
+    pytest.mark.skipif(
+        is_ci_environment() and (is_platform_windows() or is_platform_mac()),
+        reason="On GHA CI, Windows can fail with "
+        "'Windows fatal exception: stack overflow' "
+        "and macOS can timeout",
+    ),
+]
 
 
 @td.skip_if_no("numba")