Adding upstream version 4.6.0+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/providers/test_pep621_provider.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+from pathlib import Path
+from textwrap import dedent
+
+import pytest
+
+from commitizen.config.base_config import BaseConfig
+from commitizen.providers import get_provider
+from commitizen.providers.pep621_provider import Pep621Provider
+
+PEP621_TOML = """\
+[project]
+version = "0.1.0"
+"""
+
+PEP621_EXPECTED = """\
+[project]
+version = "42.1"
+"""
+
+
+@pytest.mark.parametrize(
+    "content, expected",
+    ((PEP621_TOML, PEP621_EXPECTED),),
+)
+def test_cargo_provider(
+    config: BaseConfig,
+    chdir: Path,
+    content: str,
+    expected: str,
+):
+    filename = Pep621Provider.filename
+    file = chdir / filename
+    file.write_text(dedent(content))
+    config.settings["version_provider"] = "pep621"
+
+    provider = get_provider(config)
+    assert isinstance(provider, Pep621Provider)
+    assert provider.get_version() == "0.1.0"
+
+    provider.set_version("42.1")
+    assert file.read_text() == dedent(expected)