feat: add validation schema for depdency-groups section

src/poetry/core/factory.py

@@ -620,6 +620,14 @@ def validate(
         ]
         result["errors"] += tool_poetry_validation_errors
 
+        dependency_groups = toml_data.get("dependency-groups")
+        if dependency_groups is not None:
+            dependency_groups_validation_errors = [
+                e.replace("data", "dependency-groups")
+                for e in validate_object(dependency_groups, "dependency-groups-schema")
+            ]
+            result["errors"] += dependency_groups_validation_errors
+
         # Check for required fields if package mode.
         # In non-package mode, there are no required fields.
         package_mode = tool_poetry.get("package-mode", True)

src/poetry/core/json/schemas/dependency-groups-schema.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "name": "dependency-groups",
+  "type": "object",
+  "additionalProperties": {
+    "title": "Dependency group requirements",
+    "type": "array",
+    "items": {
+      "type": "string"
+    },
+    "examples": [
+      [
+        "attrs",
+        "requests ~= 2.28"
+      ]
+    ]
+  }
+}

tests/fixtures/project_with_invalid_dependency_groups/pyproject.toml

@@ -0,0 +1,16 @@
+[dependency-groups]
+testing = [
+    "pytest",
+    ["pytest-cov", {version = ">=4.0"}],
+]
+
+[tool.poetry]
+name = "my-package"
+version = "1.2.3"
+description = "Some description."
+authors = ["Awesome Hacker <[email protected]>"]
+license = "MIT"
+
+[tool.poetry.dependencies]
+
+[tool.poetry.extras]

tests/test_factory.py

@@ -869,6 +869,21 @@ def test_create_poetry_with_invalid_dev_dependencies(caplog: LogCaptureFixture)
     assert any("dev" in r.groups for r in poetry.package.all_requires)
 
 
+@pytest.mark.parametrize("with_groups", [True, False])
+def test_create_poetry_with_invalid_dependency_groups(with_groups: bool) -> None:
+    with pytest.raises(RuntimeError) as e:
+        _ = Factory().create_poetry(
+            fixtures_dir / "project_with_invalid_dependency_groups",
+            with_groups=with_groups,
+        )
+
+    expected = """\
+The Poetry configuration is invalid:
+  - dependency-groups.testing[1] must be string
+"""
+    assert str(e.value) == expected
+
+
 def test_create_poetry_with_groups_and_legacy_dev(caplog: LogCaptureFixture) -> None:
     assert not caplog.records