diff --git a/tests/backend/common.py b/tests/backend/common.py
index 57af2674..1e298b31 100644
--- a/tests/backend/common.py
+++ b/tests/backend/common.py
@@ -6,18 +6,58 @@
 r"""Common functions for test cases of loaders and dumpers."""
 from __future__ import annotations
 
+import importlib
 import pathlib
 import re
 import typing
 
+import anyconfig.ioinfo
+import pytest
+
 from .. import common
 
 
+NAMES: tuple[str, ...] = ("ipath", "opts", "exp")
 PATH_PATTERN: re.Pattern = re.compile(
     r".+[/\\:\.]test_([^_]+)_([^_]+).py"
 )
 
 
+def get_name(testfile: str, pattern: re.Pattern = PATH_PATTERN) -> str:
+    """Get the name of backend module.
+
+    ex. tests/backend/loaders/json/test_json_stdlib.py
+    -> "json.stdlib"
+    """
+    match = pattern.match(testfile)
+    if not match:
+        raise NameError(
+            f"Filename does not match expected pattern: {testfile}"
+        )
+
+    return ".".join(match.groups())
+
+
+def get_mod(testfile: str, pattern: re.Pattern = PATH_PATTERN):
+    """Get the module to test.
+
+    :raises: ModuleNotFoundError:
+    """
+    name = get_name(testfile, pattern=pattern)
+    mname = f"anyconfig.backend.{name}"
+    try:
+        return importlib.import_module(mname)
+    except ImportError:
+        pytest.skip(
+            f"Skip becuase it failed to import: {mname}",
+            allow_module_level=True
+        )
+
+
+def get_test_ids(*args, **opts):
+    return common.get_test_ids(*args, **opts)
+
+
 def get_test_resdir(
     testfile: str,
     is_loader: bool = True,
@@ -28,14 +68,8 @@ def get_test_resdir(
     ex. tests/backend/loaders/json/test_json_stdlib.py
     -> tests/res/1/loaders/json.stdlib/
     """
-    match = pattern.match(testfile)
-    if not match:
-        raise NameError(
-            f"Filename does not match expected pattern: {testfile}"
-        )
-
-    name = ".".join(match.groups())
     subdir = "loaders" if is_loader else "dumpers"
+    name = get_name(testfile, pattern=pattern)
 
     return common.RESOURCE_DIR / subdir / name
 
@@ -49,3 +83,7 @@ def load_data_for_testfile(
     return common.load_data_for_testfile(
         testfile, datadir=datadir, **opts
     )
+
+
+def ioinfo_from_path(path: pathlib.Path) -> anyconfig.ioinfo.IOInfo:
+    return anyconfig.ioinfo.make(path)
diff --git a/tests/backend/loaders/json/test_json_stdlib.py b/tests/backend/loaders/json/test_json_stdlib.py
index 2ee6aefd..3042c293 100644
--- a/tests/backend/loaders/json/test_json_stdlib.py
+++ b/tests/backend/loaders/json/test_json_stdlib.py
@@ -16,6 +16,38 @@
 import tests.common.tdi_base
 import tests.common.loader
 
+from ... import common
+
+
+try:
+    DATA_0 = common.load_data_for_testfile(__file__)
+except FileNotFoundError:
+    pytest.skip(
+        f"Not found test data for: {__file__}",
+        allow_module_level=True
+    )
+
+DATA_IDS_0: list[str] = common.get_test_ids(DATA_0)
+Parser = getattr(common.get_mod(__file__), "Parser", None)
+
+assert Parser is not None
+
+
+@pytest.mark.parametrize(common.NAMES, DATA_0, ids=DATA_IDS_0)
+def test_loads(ipath: str, opts: dict, exp) -> None:
+    psr = Parser()
+    content = psr.ropen(ipath).read()
+
+    assert psr.loads(content, **opts) == exp
+
+
+@pytest.mark.parametrize(common.NAMES, DATA_0, ids=DATA_IDS_0)
+def test_load(ipath: str, opts: dict, exp) -> None:
+    psr = Parser()
+    ioi = common.ioinfo_from_path(ipath)
+
+    assert psr.load(ioi, **opts) == exp
+
 
 class TDI(tests.common.tdi_base.TDI):
     _cid = tests.common.tdi_base.name_from_path(__file__)