diff --git a/pandas/_testing/_warnings.py b/pandas/_testing/_warnings.py
index 9e89e09e418b3..1a8fe71ae3728 100644
--- a/pandas/_testing/_warnings.py
+++ b/pandas/_testing/_warnings.py
@@ -7,6 +7,7 @@
 import re
 import sys
 from typing import (
+    Literal,
     Sequence,
     Type,
     cast,
@@ -17,7 +18,9 @@
 @contextmanager
 def assert_produces_warning(
     expected_warning: type[Warning] | bool | None = Warning,
-    filter_level="always",
+    filter_level: Literal[
+        "error", "ignore", "always", "default", "module", "once"
+    ] = "always",
     check_stacklevel: bool = True,
     raise_on_extra_warnings: bool = True,
     match: str | None = None,
diff --git a/pandas/_testing/asserters.py b/pandas/_testing/asserters.py
index ab42fcd92a3d9..b5e288690decb 100644
--- a/pandas/_testing/asserters.py
+++ b/pandas/_testing/asserters.py
@@ -1,6 +1,9 @@
 from __future__ import annotations
 
-from typing import cast
+from typing import (
+    Literal,
+    cast,
+)
 import warnings
 
 import numpy as np
@@ -10,6 +13,7 @@
     no_default,
 )
 from pandas._libs.missing import is_matching_na
+from pandas._libs.sparse import SparseIndex
 import pandas._libs.testing as _testing
 from pandas.util._exceptions import find_stack_level
 
@@ -61,7 +65,7 @@
 def assert_almost_equal(
     left,
     right,
-    check_dtype: bool | str = "equiv",
+    check_dtype: bool | Literal["equiv"] = "equiv",
     check_less_precise: bool | int | NoDefault = no_default,
     rtol: float = 1.0e-5,
     atol: float = 1.0e-8,
@@ -169,9 +173,8 @@ def assert_almost_equal(
                 assert_class_equal(left, right, obj=obj)
 
         # if we have "equiv", this becomes True
-        check_dtype = bool(check_dtype)
         _testing.assert_almost_equal(
-            left, right, check_dtype=check_dtype, rtol=rtol, atol=atol, **kwargs
+            left, right, check_dtype=bool(check_dtype), rtol=rtol, atol=atol, **kwargs
         )
 
 
@@ -686,7 +689,7 @@ def assert_numpy_array_equal(
     left,
     right,
     strict_nan=False,
-    check_dtype=True,
+    check_dtype: bool | Literal["equiv"] = True,
     err_msg=None,
     check_same=None,
     obj="numpy array",
@@ -765,7 +768,7 @@ def _raise(left, right, err_msg):
 def assert_extension_array_equal(
     left,
     right,
-    check_dtype=True,
+    check_dtype: bool | Literal["equiv"] = True,
     index_values=None,
     check_less_precise=no_default,
     check_exact=False,
@@ -858,7 +861,7 @@ def assert_extension_array_equal(
         _testing.assert_almost_equal(
             left_valid,
             right_valid,
-            check_dtype=check_dtype,
+            check_dtype=bool(check_dtype),
             rtol=rtol,
             atol=atol,
             obj="ExtensionArray",
@@ -870,7 +873,7 @@ def assert_extension_array_equal(
 def assert_series_equal(
     left,
     right,
-    check_dtype=True,
+    check_dtype: bool | Literal["equiv"] = True,
     check_index_type="equiv",
     check_series_type=True,
     check_less_precise=no_default,
@@ -1064,7 +1067,7 @@ def assert_series_equal(
             right._values,
             rtol=rtol,
             atol=atol,
-            check_dtype=check_dtype,
+            check_dtype=bool(check_dtype),
             obj=str(obj),
             index_values=np.asarray(left.index),
         )
@@ -1100,7 +1103,7 @@ def assert_series_equal(
             right._values,
             rtol=rtol,
             atol=atol,
-            check_dtype=check_dtype,
+            check_dtype=bool(check_dtype),
             obj=str(obj),
             index_values=np.asarray(left.index),
         )
@@ -1125,7 +1128,7 @@ def assert_series_equal(
 def assert_frame_equal(
     left,
     right,
-    check_dtype=True,
+    check_dtype: bool | Literal["equiv"] = True,
     check_index_type="equiv",
     check_column_type="equiv",
     check_frame_type=True,
@@ -1403,8 +1406,8 @@ def assert_sp_array_equal(left, right):
     assert_numpy_array_equal(left.sp_values, right.sp_values)
 
     # SparseIndex comparison
-    assert isinstance(left.sp_index, pd._libs.sparse.SparseIndex)
-    assert isinstance(right.sp_index, pd._libs.sparse.SparseIndex)
+    assert isinstance(left.sp_index, SparseIndex)
+    assert isinstance(right.sp_index, SparseIndex)
 
     left_index = left.sp_index
     right_index = right.sp_index
diff --git a/pandas/util/_test_decorators.py b/pandas/util/_test_decorators.py
index d7eba6b8319fb..bbcf984e68b4b 100644
--- a/pandas/util/_test_decorators.py
+++ b/pandas/util/_test_decorators.py
@@ -35,6 +35,7 @@ def test_foo():
 
 from pandas._config import get_option
 
+from pandas._typing import F
 from pandas.compat import (
     IS64,
     is_platform_windows,
@@ -216,7 +217,7 @@ def skip_if_np_lt(ver_str: str, *args, reason: str | None = None):
     )
 
 
-def parametrize_fixture_doc(*args):
+def parametrize_fixture_doc(*args) -> Callable[[F], F]:
     """
     Intended for use as a decorator for parametrized fixture,
     this function will wrap the decorated function with a pytest