From aabb94066ea448a17546c29c170f60ca4d50266c Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell@cp.catapult.org.uk>
Date: Thu, 12 Feb 2026 14:23:33 +0000
Subject: [PATCH 01/12] Adds JSON support to data regression fixture

---
 src/pytest_regressions/data_regression.py | 40 +++++++++----
 tests/test_data_regression.py             | 70 +++++++++++++++++++----
 2 files changed, 86 insertions(+), 24 deletions(-)

diff --git a/src/pytest_regressions/data_regression.py b/src/pytest_regressions/data_regression.py
index 8252cef..20a754d 100644
--- a/src/pytest_regressions/data_regression.py
+++ b/src/pytest_regressions/data_regression.py
@@ -1,4 +1,5 @@
 import os
+import json
 from collections.abc import Callable
 from collections.abc import MutableMapping
 from functools import partial
@@ -41,6 +42,7 @@ def check(
         basename: str | None = None,
         fullpath: Optional["os.PathLike[str]"] = None,
         round_digits: int | None = None,
+        extension: str = ".yml",
     ) -> None:
         """
         Checks the given dict against a previously recorded version, or generate a new file.
@@ -58,6 +60,10 @@ def check(
         :param round_digits:
             If given, round all floats in the dict to the given number of digits.
 
+        :param extension: Extension of the file. Defaults to ".yml".
+            If equal to ".json", expects `data_dict` to be JSON serializable
+            and dumps it using standard `json.dump`.
+
         ``basename`` and ``fullpath`` are exclusive.
         """
         __tracebackhide__ = True
@@ -67,17 +73,27 @@ def check(
 
         def dump(filename: Path) -> None:
             """Dump dict contents to the given filename"""
-
-            dumped_str = yaml.dump_all(
-                [data_dict],
-                Dumper=RegressionYamlDumper,
-                default_flow_style=False,
-                allow_unicode=True,
-                indent=2,
-                encoding="utf-8",
-            )
-            with filename.open("wb") as f:
-                f.write(dumped_str)
+            if extension.lower() in [".yml", ".yaml"]:
+                dumped_str = yaml.dump_all(
+                    [data_dict],
+                    Dumper=RegressionYamlDumper,
+                    default_flow_style=False,
+                    allow_unicode=True,
+                    indent=2,
+                    encoding="utf-8",
+                )
+                with filename.open("wb") as f:
+                    f.write(dumped_str)
+            elif extension.lower() == ".json":
+                with filename.open("w", encoding="utf-8") as f:
+                    json.dump(
+                        data_dict, f, indent=2, sort_keys=True, ensure_ascii=False
+                    )
+            else:
+                raise NotImplementedError(
+                    f"file extension `{extension}` is not supported by data_regression; "
+                    "supported extensions are '.yml', '.yaml', '.json'"
+                )
 
         perform_regression_check(
             datadir=self.datadir,
@@ -85,7 +101,7 @@ def dump(filename: Path) -> None:
             request=self.request,
             check_fn=partial(check_text_files, encoding="UTF-8"),
             dump_fn=dump,
-            extension=".yml",
+            extension=extension,
             basename=basename,
             fullpath=fullpath,
             force_regen=self.force_regen,
diff --git a/tests/test_data_regression.py b/tests/test_data_regression.py
index f3c3aa3..795ba3e 100644
--- a/tests/test_data_regression.py
+++ b/tests/test_data_regression.py
@@ -8,16 +8,18 @@
 from pytest_regressions.testing import check_regression_fixture_workflow
 
 
-def test_example(data_regression: DataRegressionFixture) -> None:
+@pytest.mark.parametrize("extension", [".yml", ".json"])
+def test_example(data_regression: DataRegressionFixture, extension: str) -> None:
     """Basic example"""
     contents = {"contents": "Foo", "value": 11}
-    data_regression.check(contents)
+    data_regression.check(contents, extension=extension)
 
 
-def test_basename(data_regression: DataRegressionFixture) -> None:
+@pytest.mark.parametrize("extension", [".yml", ".json"])
+def test_basename(data_regression: DataRegressionFixture, extension: str) -> None:
     """Basic example using basename parameter"""
     contents = {"contents": "Foo", "value": 11}
-    data_regression.check(contents, basename="case.normal")
+    data_regression.check(contents, basename="case.normal", extension=extension)
 
 
 def test_integer_keys(data_regression: DataRegressionFixture) -> None:
@@ -51,14 +53,15 @@ def dump_scalar(dumper, scalar):
     data_regression.check(contents)
 
 
-def test_round_digits(data_regression: DataRegressionFixture) -> None:
+@pytest.mark.parametrize("extension", [".yml", ".json"])
+def test_round_digits(data_regression: DataRegressionFixture, extension: str) -> None:
     """Example including float numbers and check rounding capabilities."""
     contents = {
         "content": {"value1": "toto", "value": 1.123456789},
         "values": [1.12345, 2.34567],
         "value": 1.23456789,
     }
-    data_regression.check(contents, round_digits=2)
+    data_regression.check(contents, round_digits=2, extension=extension)
 
     with pytest.raises(AssertionError):
         contents = {
@@ -66,7 +69,7 @@ def test_round_digits(data_regression: DataRegressionFixture) -> None:
             "values": [1.13456, 2.45678],
             "value": 1.23456789,
         }
-        data_regression.check(contents, round_digits=2)
+        data_regression.check(contents, round_digits=2, extension=extension)
 
 
 def test_usage_workflow(pytester, monkeypatch):
@@ -101,21 +104,56 @@ def get_yaml_contents():
     )
 
 
-def test_data_regression_full_path(pytester, tmp_path):
+def test_usage_workflow_json(pytester, monkeypatch):
+    import json
+
+    monkeypatch.setattr(
+        sys, "testing_get_data", lambda: {"contents": "Foo", "value": 10}, raising=False
+    )
+    source = """
+        import sys
+        def test_1(data_regression) -> None:
+            contents = sys.testing_get_data()
+            data_regression.check(contents, extension=".json")
+    """
+
+    def get_json_contents():
+        json_filename = pytester.path / "test_file" / "test_1.json"
+        assert json_filename.is_file()
+        with json_filename.open() as f:
+            return json.load(f)
+
+    check_regression_fixture_workflow(
+        pytester,
+        source=source,
+        data_getter=get_json_contents,
+        data_modifier=lambda: monkeypatch.setattr(
+            sys,
+            "testing_get_data",
+            lambda: {"contents": "Bar", "value": 20},
+            raising=False,
+        ),
+        expected_data_1={"contents": "Foo", "value": 10},
+        expected_data_2={"contents": "Bar", "value": 20},
+    )
+
+
+@pytest.mark.parametrize("extension", [".yml", ".json"])
+def test_data_regression_full_path(pytester, tmp_path, extension):
     """
     Test data_regression with ``fullpath`` parameter.
     """
-    fullpath = tmp_path.joinpath("full/path/to/contents.yaml")
+    fullpath = tmp_path.joinpath(f"full/path/to/contents{extension}")
     fullpath.parent.mkdir(parents=True)
     assert not fullpath.is_file()
 
     source = """
         def test(data_regression) -> None:
             contents = {'data': [1, 2]}
-            data_regression.check(contents, fullpath=%s)
-    """ % (repr(str(fullpath)))
+            data_regression.check(contents, fullpath=%s, extension=%r)
+    """ % (repr(str(fullpath)), extension)
     pytester.makepyfile(test_foo=source)
-    # First run fails because there's no yml file yet
+    # First run fails because there's no expected file yet
     result = pytester.inline_run()
     result.assertoutcome(failed=1)
 
@@ -210,6 +248,14 @@ def __init__(self, value, unit):
     assert not yaml_file.is_file()
 
 
+def test_unsupported_extension(data_regression):
+    data = {"foo": "bar"}
+    with pytest.raises(
+        NotImplementedError, match=r"file extension `\.txt` is not supported"
+    ):
+        data_regression.check(data, extension=".txt")
+
+
 def test_regen_all(pytester, tmp_path):
     source = """
         def test_1(data_regression) -> None:

From fa7a1f45241d67db953675974f13e758342ab163 Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell@cp.catapult.org.uk>
Date: Thu, 12 Feb 2026 14:23:34 +0000
Subject: [PATCH 02/12] Adds expected JSON regression files

---
 tests/test_data_regression/case.normal.json           |  4 ++++
 tests/test_data_regression/test_example__json_.json   |  4 ++++
 tests/test_data_regression/test_example__yml_.yml     |  2 ++
 .../test_round_digits__json_.json                     | 11 +++++++++++
 .../test_data_regression/test_round_digits__yml_.yml  |  7 +++++++
 tests/test_data_regression_json/custom_name.json      |  3 +++
 .../test_json_regression.json                         |  8 ++++++++
 7 files changed, 39 insertions(+)
 create mode 100644 tests/test_data_regression/case.normal.json
 create mode 100644 tests/test_data_regression/test_example__json_.json
 create mode 100644 tests/test_data_regression/test_example__yml_.yml
 create mode 100644 tests/test_data_regression/test_round_digits__json_.json
 create mode 100644 tests/test_data_regression/test_round_digits__yml_.yml
 create mode 100644 tests/test_data_regression_json/custom_name.json
 create mode 100644 tests/test_data_regression_json/test_json_regression.json

diff --git a/tests/test_data_regression/case.normal.json b/tests/test_data_regression/case.normal.json
new file mode 100644
index 0000000..f6de75c
--- /dev/null
+++ b/tests/test_data_regression/case.normal.json
@@ -0,0 +1,4 @@
+{
+  "contents": "Foo",
+  "value": 11
+}
\ No newline at end of file
diff --git a/tests/test_data_regression/test_example__json_.json b/tests/test_data_regression/test_example__json_.json
new file mode 100644
index 0000000..f6de75c
--- /dev/null
+++ b/tests/test_data_regression/test_example__json_.json
@@ -0,0 +1,4 @@
+{
+  "contents": "Foo",
+  "value": 11
+}
\ No newline at end of file
diff --git a/tests/test_data_regression/test_example__yml_.yml b/tests/test_data_regression/test_example__yml_.yml
new file mode 100644
index 0000000..f605447
--- /dev/null
+++ b/tests/test_data_regression/test_example__yml_.yml
@@ -0,0 +1,2 @@
+contents: Foo
+value: 11
diff --git a/tests/test_data_regression/test_round_digits__json_.json b/tests/test_data_regression/test_round_digits__json_.json
new file mode 100644
index 0000000..3fa1033
--- /dev/null
+++ b/tests/test_data_regression/test_round_digits__json_.json
@@ -0,0 +1,11 @@
+{
+  "content": {
+    "value": 1.12,
+    "value1": "toto"
+  },
+  "value": 1.23,
+  "values": [
+    1.12,
+    2.35
+  ]
+}
\ No newline at end of file
diff --git a/tests/test_data_regression/test_round_digits__yml_.yml b/tests/test_data_regression/test_round_digits__yml_.yml
new file mode 100644
index 0000000..54cc585
--- /dev/null
+++ b/tests/test_data_regression/test_round_digits__yml_.yml
@@ -0,0 +1,7 @@
+content:
+  value: 1.12
+  value1: toto
+value: 1.23
+values:
+- 1.12
+- 2.35
diff --git a/tests/test_data_regression_json/custom_name.json b/tests/test_data_regression_json/custom_name.json
new file mode 100644
index 0000000..b42f309
--- /dev/null
+++ b/tests/test_data_regression_json/custom_name.json
@@ -0,0 +1,3 @@
+{
+  "foo": "bar"
+}
\ No newline at end of file
diff --git a/tests/test_data_regression_json/test_json_regression.json b/tests/test_data_regression_json/test_json_regression.json
new file mode 100644
index 0000000..62cc568
--- /dev/null
+++ b/tests/test_data_regression_json/test_json_regression.json
@@ -0,0 +1,8 @@
+{
+  "baz": [
+    1,
+    2,
+    3
+  ],
+  "foo": "bar"
+}
\ No newline at end of file

From 4555f36fe540c9d65ca5b97fadb1f06ae9b0e59c Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell@cp.catapult.org.uk>
Date: Thu, 12 Feb 2026 15:35:12 +0000
Subject: [PATCH 03/12] Add recursive dictionary sorting utility and integrate
 it into data regression fixture

---
 src/pytest_regressions/common.py          | 14 ++++++++++++++
 src/pytest_regressions/data_regression.py |  4 +++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/pytest_regressions/common.py b/src/pytest_regressions/common.py
index de2f23d..68f1a6b 100644
--- a/src/pytest_regressions/common.py
+++ b/src/pytest_regressions/common.py
@@ -20,6 +20,20 @@ def import_error_message(libname: str) -> str:
     return f"'{libname}' library is an optional dependency and must be installed explicitly when the fixture 'check' is used"
 
 
+def sort_dict_by_keys(data: MutableMapping[Any, Any]) -> MutableMapping[Any, Any]:
+    """Recursively sort a dict by its keys.
+
+    :param data: The dict to sort.
+    :return: The sorted dict.
+    """
+    data = {
+        k: sort_dict_by_keys(v) if isinstance(v, MutableMapping) else v
+        for k, v in data.items()
+    }
+
+    return dict(sorted(data.items()))
+
+
 def check_text_files(
     obtained_fn: "os.PathLike[str]",
     expected_fn: "os.PathLike[str]",
diff --git a/src/pytest_regressions/data_regression.py b/src/pytest_regressions/data_regression.py
index 20a754d..5ebaa2b 100644
--- a/src/pytest_regressions/data_regression.py
+++ b/src/pytest_regressions/data_regression.py
@@ -11,7 +11,7 @@
 import pytest
 import yaml
 
-from .common import check_text_files
+from .common import check_text_files, sort_dict_by_keys
 from .common import perform_regression_check
 from .common import round_digits_in_data
 
@@ -71,6 +71,8 @@ def check(
         if round_digits is not None:
             round_digits_in_data(data_dict, round_digits)
 
+        data_dict = sort_dict_by_keys(data_dict)
+
         def dump(filename: Path) -> None:
             """Dump dict contents to the given filename"""
             if extension.lower() in [".yml", ".yaml"]:

From 1658c31a1678dc1cd57f17287f46887343688f52 Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell@cp.catapult.org.uk>
Date: Thu, 12 Feb 2026 15:40:28 +0000
Subject: [PATCH 04/12] Update JSON output formatting in data regression
 fixture to use 4-space indentation

---
 src/pytest_regressions/data_regression.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pytest_regressions/data_regression.py b/src/pytest_regressions/data_regression.py
index 5ebaa2b..1e4bc11 100644
--- a/src/pytest_regressions/data_regression.py
+++ b/src/pytest_regressions/data_regression.py
@@ -89,7 +89,7 @@ def dump(filename: Path) -> None:
             elif extension.lower() == ".json":
                 with filename.open("w", encoding="utf-8") as f:
                     json.dump(
-                        data_dict, f, indent=2, sort_keys=True, ensure_ascii=False
+                        data_dict, f, indent=4, sort_keys=True, ensure_ascii=False
                     )
             else:
                 raise NotImplementedError(

From ed8e9b5d766425644d21a974dffa9138adab7513 Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell@cp.catapult.org.uk>
Date: Thu, 23 Apr 2026 12:22:08 +0100
Subject: [PATCH 05/12] Refactor JSON dumping in DataRegressionFixture to use
 2-space indentation

---
 src/pytest_regressions/data_regression.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/pytest_regressions/data_regression.py b/src/pytest_regressions/data_regression.py
index 1e4bc11..4d57db5 100644
--- a/src/pytest_regressions/data_regression.py
+++ b/src/pytest_regressions/data_regression.py
@@ -1,5 +1,5 @@
-import os
 import json
+import os
 from collections.abc import Callable
 from collections.abc import MutableMapping
 from functools import partial
@@ -11,9 +11,10 @@
 import pytest
 import yaml
 
-from .common import check_text_files, sort_dict_by_keys
+from .common import check_text_files
 from .common import perform_regression_check
 from .common import round_digits_in_data
+from .common import sort_dict_by_keys
 
 if TYPE_CHECKING:
     from pytest_datadir.plugin import LazyDataDir
@@ -89,7 +90,7 @@ def dump(filename: Path) -> None:
             elif extension.lower() == ".json":
                 with filename.open("w", encoding="utf-8") as f:
                     json.dump(
-                        data_dict, f, indent=4, sort_keys=True, ensure_ascii=False
+                        data_dict, f, indent=2, sort_keys=True, ensure_ascii=False
                     )
             else:
                 raise NotImplementedError(

From 28913a8ae91dab6c3122ab17e702b8b35026d026 Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell@cp.catapult.org.uk>
Date: Fri, 24 Apr 2026 11:10:06 +0100
Subject: [PATCH 06/12] Update src/pytest_regressions/data_regression.py

When using the JSON path, the file is opened and json.dump writes directly to disk. If serialization fails (TypeError for non-serializable objects), this can leave an empty/partial expected/obtained file behind, unlike the YAML path which renders to bytes before opening the file. serializing to a string first (e.g., json.dumps) and only writing after successful serialization.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 src/pytest_regressions/data_regression.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/pytest_regressions/data_regression.py b/src/pytest_regressions/data_regression.py
index 4d57db5..fa8cfd1 100644
--- a/src/pytest_regressions/data_regression.py
+++ b/src/pytest_regressions/data_regression.py
@@ -88,10 +88,11 @@ def dump(filename: Path) -> None:
                 with filename.open("wb") as f:
                     f.write(dumped_str)
             elif extension.lower() == ".json":
+                dumped_str = json.dumps(
+                    data_dict, indent=2, sort_keys=True, ensure_ascii=False
+                )
                 with filename.open("w", encoding="utf-8") as f:
-                    json.dump(
-                        data_dict, f, indent=2, sort_keys=True, ensure_ascii=False
-                    )
+                    f.write(dumped_str)
             else:
                 raise NotImplementedError(
                     f"file extension `{extension}` is not supported by data_regression; "

From 8e40b08f29b3f60d9bc6d21002ab58d1ee77a49b Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell@cp.catapult.org.uk>
Date: Fri, 24 Apr 2026 11:24:17 +0100
Subject: [PATCH 07/12] Update src/pytest_regressions/common.py
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The docstring says this function recursively sorts dicts, but the implementation only recurses into mapping values and won’t sort dicts nested inside sequences (e.g., [{...}, {...}]). Consider extending it to walk MutableSequence values too, or tightening the docstring/name to match the actual behavior.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 src/pytest_regressions/common.py | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/pytest_regressions/common.py b/src/pytest_regressions/common.py
index 68f1a6b..e413181 100644
--- a/src/pytest_regressions/common.py
+++ b/src/pytest_regressions/common.py
@@ -21,19 +21,21 @@ def import_error_message(libname: str) -> str:
 
 
 def sort_dict_by_keys(data: MutableMapping[Any, Any]) -> MutableMapping[Any, Any]:
-    """Recursively sort a dict by its keys.
+    """Recursively sort a dict by its keys, including nested dicts in sequences.
 
     :param data: The dict to sort.
     :return: The sorted dict.
     """
-    data = {
-        k: sort_dict_by_keys(v) if isinstance(v, MutableMapping) else v
-        for k, v in data.items()
-    }
-
-    return dict(sorted(data.items()))
 
+    def _sort_nested(value: Any) -> Any:
+        if isinstance(value, MutableMapping):
+            normalized = {k: _sort_nested(v) for k, v in value.items()}
+            return dict(sorted(normalized.items()))
+        if isinstance(value, MutableSequence):
+            return [_sort_nested(item) for item in value]
+        return value
 
+    return _sort_nested(data)
 def check_text_files(
     obtained_fn: "os.PathLike[str]",
     expected_fn: "os.PathLike[str]",

From 93e5cd406a84c6e42474f102790349831b4346c1 Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell.research@gmail.com>
Date: Fri, 24 Apr 2026 11:29:21 +0100
Subject: [PATCH 08/12] Add JSON sorting test to validate sort_dict_by_keys
 functionality

Co-authored-by: Copilot <copilot@github.com>
---
 tests/test_data_regression.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tests/test_data_regression.py b/tests/test_data_regression.py
index 795ba3e..beb62f1 100644
--- a/tests/test_data_regression.py
+++ b/tests/test_data_regression.py
@@ -1,13 +1,33 @@
+import json
 import sys
 from textwrap import dedent
 
 import pytest
 import yaml
 
+from pytest_regressions.common import sort_dict_by_keys
 from pytest_regressions.data_regression import DataRegressionFixture
 from pytest_regressions.testing import check_regression_fixture_workflow
 
 
+def test_sort_dict_by_keys_matches_json_sort_keys() -> None:
+    contents = {
+        "z": [{"b": 2, "a": 1}, {"k": 0, "inner": [{"d": 4, "c": 3}]}],
+        "a": {"y": 2, "x": 1},
+        "m": [{"beta": 2, "alpha": 1}, ["keep", {"bb": 2, "aa": 1}]],
+    }
+
+    sorted_contents = sort_dict_by_keys(contents)
+
+    assert list(sorted_contents) == ["a", "m", "z"]
+    assert list(sorted_contents["z"][0]) == ["a", "b"]
+    assert list(sorted_contents["z"][1]["inner"][0]) == ["c", "d"]
+    assert list(sorted_contents["m"][0]) == ["alpha", "beta"]
+    assert list(sorted_contents["m"][1][1]) == ["aa", "bb"]
+
+    assert json.dumps(sorted_contents) == json.dumps(contents, sort_keys=True)
+
+
 @pytest.mark.parametrize("extension", [".yml", ".json"])
 def test_example(data_regression: DataRegressionFixture, extension: str) -> None:
     """Basic example"""

From b44d3dbfbe7e72accbbdab298b6b7134f21e22e1 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 24 Apr 2026 10:30:01 +0000
Subject: [PATCH 09/12] Remove stale and unused baseline test data files

Agent-Logs-Url: https://github.com/MitchellAcoustics/pytest-regressions/sessions/ecff2466-7c11-4a25-87cb-0ebd388921c3

Co-authored-by: MitchellAcoustics <22335636+MitchellAcoustics@users.noreply.github.com>
---
 tests/test_data_regression/test_example.yml               | 2 --
 tests/test_data_regression/test_round_digits.yml          | 7 -------
 tests/test_data_regression_json/custom_name.json          | 3 ---
 tests/test_data_regression_json/test_json_regression.json | 8 --------
 4 files changed, 20 deletions(-)
 delete mode 100644 tests/test_data_regression/test_example.yml
 delete mode 100644 tests/test_data_regression/test_round_digits.yml
 delete mode 100644 tests/test_data_regression_json/custom_name.json
 delete mode 100644 tests/test_data_regression_json/test_json_regression.json

diff --git a/tests/test_data_regression/test_example.yml b/tests/test_data_regression/test_example.yml
deleted file mode 100644
index f605447..0000000
--- a/tests/test_data_regression/test_example.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-contents: Foo
-value: 11
diff --git a/tests/test_data_regression/test_round_digits.yml b/tests/test_data_regression/test_round_digits.yml
deleted file mode 100644
index 54cc585..0000000
--- a/tests/test_data_regression/test_round_digits.yml
+++ /dev/null
@@ -1,7 +0,0 @@
-content:
-  value: 1.12
-  value1: toto
-value: 1.23
-values:
-- 1.12
-- 2.35
diff --git a/tests/test_data_regression_json/custom_name.json b/tests/test_data_regression_json/custom_name.json
deleted file mode 100644
index b42f309..0000000
--- a/tests/test_data_regression_json/custom_name.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "foo": "bar"
-}
\ No newline at end of file
diff --git a/tests/test_data_regression_json/test_json_regression.json b/tests/test_data_regression_json/test_json_regression.json
deleted file mode 100644
index 62cc568..0000000
--- a/tests/test_data_regression_json/test_json_regression.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "baz": [
-    1,
-    2,
-    3
-  ],
-  "foo": "bar"
-}
\ No newline at end of file

From 87e433a39bc04c455d598a2734ea7a3b715776dd Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Fri, 24 Apr 2026 10:48:38 +0000
Subject: [PATCH 10/12] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 src/pytest_regressions/common.py                         | 2 ++
 tests/test_data_regression/case.normal.json              | 2 +-
 tests/test_data_regression/test_example__json_.json      | 2 +-
 tests/test_data_regression/test_round_digits__json_.json | 2 +-
 4 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/pytest_regressions/common.py b/src/pytest_regressions/common.py
index e413181..123c974 100644
--- a/src/pytest_regressions/common.py
+++ b/src/pytest_regressions/common.py
@@ -36,6 +36,8 @@ def _sort_nested(value: Any) -> Any:
         return value
 
     return _sort_nested(data)
+
+
 def check_text_files(
     obtained_fn: "os.PathLike[str]",
     expected_fn: "os.PathLike[str]",
diff --git a/tests/test_data_regression/case.normal.json b/tests/test_data_regression/case.normal.json
index f6de75c..573d49b 100644
--- a/tests/test_data_regression/case.normal.json
+++ b/tests/test_data_regression/case.normal.json
@@ -1,4 +1,4 @@
 {
   "contents": "Foo",
   "value": 11
-}
\ No newline at end of file
+}
diff --git a/tests/test_data_regression/test_example__json_.json b/tests/test_data_regression/test_example__json_.json
index f6de75c..573d49b 100644
--- a/tests/test_data_regression/test_example__json_.json
+++ b/tests/test_data_regression/test_example__json_.json
@@ -1,4 +1,4 @@
 {
   "contents": "Foo",
   "value": 11
-}
\ No newline at end of file
+}
diff --git a/tests/test_data_regression/test_round_digits__json_.json b/tests/test_data_regression/test_round_digits__json_.json
index 3fa1033..a7593a6 100644
--- a/tests/test_data_regression/test_round_digits__json_.json
+++ b/tests/test_data_regression/test_round_digits__json_.json
@@ -8,4 +8,4 @@
     1.12,
     2.35
   ]
-}
\ No newline at end of file
+}

From 2a7ea5e9889a4a868e2e020c258afcd418a426e7 Mon Sep 17 00:00:00 2001
From: Andrew Mitchell <andrew.mitchell@cp.catapult.org.uk>
Date: Fri, 24 Apr 2026 13:49:13 +0100
Subject: [PATCH 11/12] Make indent configurable in data regression functions

---
 src/pytest_regressions/data_regression.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/pytest_regressions/data_regression.py b/src/pytest_regressions/data_regression.py
index fa8cfd1..e3685d7 100644
--- a/src/pytest_regressions/data_regression.py
+++ b/src/pytest_regressions/data_regression.py
@@ -44,6 +44,8 @@ def check(
         fullpath: Optional["os.PathLike[str]"] = None,
         round_digits: int | None = None,
         extension: str = ".yml",
+        *,
+        indent: int = 2
     ) -> None:
         """
         Checks the given dict against a previously recorded version, or generate a new file.
@@ -82,14 +84,14 @@ def dump(filename: Path) -> None:
                     Dumper=RegressionYamlDumper,
                     default_flow_style=False,
                     allow_unicode=True,
-                    indent=2,
+                    indent=indent,
                     encoding="utf-8",
                 )
                 with filename.open("wb") as f:
                     f.write(dumped_str)
             elif extension.lower() == ".json":
                 dumped_str = json.dumps(
-                    data_dict, indent=2, sort_keys=True, ensure_ascii=False
+                    data_dict, indent=indent, sort_keys=True, ensure_ascii=False
                 )
                 with filename.open("w", encoding="utf-8") as f:
                     f.write(dumped_str)

From 918f3ab6dc3db1b92d5bb86b76875dda8d6c7519 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Fri, 24 Apr 2026 12:49:26 +0000
Subject: [PATCH 12/12] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 src/pytest_regressions/data_regression.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pytest_regressions/data_regression.py b/src/pytest_regressions/data_regression.py
index e3685d7..0cd44d8 100644
--- a/src/pytest_regressions/data_regression.py
+++ b/src/pytest_regressions/data_regression.py
@@ -45,7 +45,7 @@ def check(
         round_digits: int | None = None,
         extension: str = ".yml",
         *,
-        indent: int = 2
+        indent: int = 2,
     ) -> None:
         """
         Checks the given dict against a previously recorded version, or generate a new file.