test: add tests for namespaced package

tests/data/project_using_namespace/.gitignore

@@ -0,0 +1 @@
+/build

tests/data/project_using_namespace/foo/database/bar.py

@@ -0,0 +1,7 @@
+from os import chdir, walk
+from pathlib import Path
+
+import flake8
+import white as w
+
+from foo import api

tests/data/project_using_namespace/pyproject.toml

@@ -0,0 +1,17 @@
+[project]
+# PEP 621 project metadata
+# See https://www.python.org/dev/peps/pep-0621/
+name = "foo"
+version = "1.2.3"
+requires-python = ">=3.7"
+dependencies = ["tomli==2.0.1"]
+
+[project.optional-dependencies]
+dev = ["flake8==7.1.1"]
+
+[build-system]
+requires = ["setuptools>=61.0.0"]
+build-backend = "setuptools.build_meta"
+
+[tool.deptry]
+pep621_dev_dependency_groups = ["dev"]

tests/functional/cli/test_cli_namespace.py

@@ -0,0 +1,70 @@
+from __future__ import annotations
+
+import uuid
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+import pytest
+
+from tests.functional.utils import Project
+from tests.utils import get_issues_report
+
+if TYPE_CHECKING:
+    from tests.utils import PipVenvFactory
+
+
+@pytest.mark.xdist_group(name=Project.NAMESPACE)
+def test_cli_with_namespace(pip_venv_factory: PipVenvFactory) -> None:
+    with pip_venv_factory(Project.NAMESPACE) as virtual_env:
+        issue_report = f"{uuid.uuid4()}.json"
+        result = virtual_env.run(f"deptry . --experimental-namespace-package -o {issue_report}")
+
+        assert result.returncode == 1
+        assert get_issues_report(Path(issue_report)) == [
+            {
+                "error": {"code": "DEP004", "message": "'flake8' imported but declared as a dev dependency"},
+                "module": "flake8",
+                "location": {"file": str(Path("foo/database/bar.py")), "line": 4, "column": 8},
+            },
+            {
+                "error": {"code": "DEP001", "message": "'white' imported but missing from the dependency definitions"},
+                "module": "white",
+                "location": {"file": str(Path("foo/database/bar.py")), "line": 5, "column": 8},
+            },
+            {
+                "error": {"code": "DEP002", "message": "'tomli' defined as a dependency but not used in the codebase"},
+                "module": "tomli",
+                "location": {"file": str(Path("pyproject.toml")), "line": None, "column": None},
+            },
+        ]
+
+
+@pytest.mark.xdist_group(name=Project.NAMESPACE)
+def test_cli_with_namespace_without_experimental_flag(pip_venv_factory: PipVenvFactory) -> None:
+    with pip_venv_factory(Project.NAMESPACE) as virtual_env:
+        issue_report = f"{uuid.uuid4()}.json"
+        result = virtual_env.run(f"deptry . -o {issue_report}")
+
+        assert result.returncode == 1
+        assert get_issues_report(Path(issue_report)) == [
+            {
+                "error": {"code": "DEP004", "message": "'flake8' imported but declared as a dev dependency"},
+                "module": "flake8",
+                "location": {"file": str(Path("foo/database/bar.py")), "line": 4, "column": 8},
+            },
+            {
+                "error": {"code": "DEP001", "message": "'white' imported but missing from the dependency definitions"},
+                "module": "white",
+                "location": {"file": str(Path("foo/database/bar.py")), "line": 5, "column": 8},
+            },
+            {
+                "error": {"code": "DEP003", "message": "'foo' imported but it is a transitive dependency"},
+                "module": "foo",
+                "location": {"file": "foo/database/bar.py", "line": 7, "column": 1},
+            },
+            {
+                "error": {"code": "DEP002", "message": "'tomli' defined as a dependency but not used in the codebase"},
+                "module": "tomli",
+                "location": {"file": str(Path("pyproject.toml")), "line": None, "column": None},
+            },
+        ]

tests/functional/utils.py

@@ -11,6 +11,7 @@ class Project(str, Enum):
     FUTURE_DEPRECATED_OBSOLETE_ARGUMENT = "project_with_future_deprecated_obsolete_argument"
     GITIGNORE = "project_with_gitignore"
     MULTIPLE_SOURCE_DIRECTORIES = "project_with_multiple_source_directories"
+    NAMESPACE = "project_using_namespace"
     PDM = "project_with_pdm"
     POETRY = "project_with_poetry"
     PYPROJECT_DIFFERENT_DIRECTORY = "project_with_pyproject_different_directory"